Based on a large number of field investigations and laboratory tests, according to the physical parameters of different debris flow deposits on site, the viscosity range of debris flow slurry and the solid particle gradation of debris flow are determined. Through the test, the water and soil ratio of slurry in different viscosity range is determined, and debris flow slurry with different viscosity is configured according to the water and soil ratio. Through the screening test, the solid particle gradation of debris flow is determined. Considering the different combinations of three factors of debris flow slurry viscosity, solid ratio and particle gradation, the debris flow siltation bodies in different states are manually configured, and the bearing capacity test of debris flow siltation bodies is carried out to study the consolidation characteristics and temporal and spatial variation characteristics of bearing capacity of debris flow siltation bodies with different viscosity, solid ratio and particle gradation.
LIU Bin , SU Na , XU Linrong , CHEN Hongkai
(1) Data content: This data set is based on the Xiaguiwa landslide in the Sanjiang basin of the Qinghai-Tibet Plateau, reconstructing the bedding slope of the Xiaguiwa landslide; the bedding slope of the Xiaguiwa landslide is used as a reference for shaking table model tests, which is used to design the shaking table model test model and sensor layout diagram for the bedding rock slope, with a weak rock layer in the model slope, and the sensors deployed are acceleration sensors and velocity sensors, and the measured (2) Data source and processing method: The data set is drawn by Guo Mingzhu of Beijing University of Technology using CAD software. (3) The data provide reference for the subsequent shaking table model test implementation.
(1) Data content: This data set is based on the Xuelongnang landslide in the Sanjiang basin of the Qinghai-Tibet Plateau, and reconstructs the counter-bedding slope before the slide; the counter-bedding slope before the slide is used as a reference for the shaking table model test, which is used to design the shaking table model test model and the sensor layout diagram for the counter-bedding rock slope, and a special joint is set in the model slope, and the deployed sensors are the acceleration sensors and the velocity sensors. (2) Data source and processing method: The data set is drawn by Guo Mingzhu of Beijing University of Technology using CAD software. (3) The data provide reference for the subsequent shaking table model test implementation.
This sub topic obtains the physical and mechanical indexes of sliding zone soil and bedrock of typical major landslides (zanong landslide, zongrongcun landslide and xiaguiwa landslide) in Jinsha River Basin of Qinghai Tibet Plateau. The physical and mechanical indexes of sliding zone soil are mainly obtained by large-scale direct shear test. The obtained physical and mechanical indexes provide a scientific basis for subsequent physical model tests and revealing the internal and external dynamic coupling mechanism. The shear strength test of sliding zone soil adopts large-scale direct shear instrument, and there are three groups considering different moisture content. In the large-scale direct shear test, the remolded sliding zone soil specimens with different moisture content are made for three typical landslides respectively, and the shear strength normal pressure relationship curve of sliding zone soil with different moisture content is obtained, and then the shear strength index of sliding zone soil with different moisture content is obtained.
This sub topic obtains the physical and mechanical indexes of bedrock of typical major landslides (zanong landslide, zongrongcun landslide and xiaguiwa landslide) in Jinsha River Basin of Qinghai Tibet Plateau. The physical and mechanical indexes of bedrock are mainly obtained through point load test. The obtained physical and mechanical indexes provide a scientific basis for subsequent physical model test and revealing the internal and external dynamic coupling mechanism. The strength test of typical landslide rock block adopts point load instrument, with no less than 15 specimens in each group, a total of 5 groups. There are five kinds of rock samples for point load test, namely limestone, ophiolite, mica gneiss, diorite and schist. Among them, diorite is loaded in cylindrical radial direction, and the rest are irregular rock samples. The size of the experimental results is corrected, and the experimental state is natural water content.
We have studied the Petrotectonic attributes of granites distributed in a large area in the North Lancangjiang structure in Bitu area. The major and trace elements and Sr Nd isotopes have been completed in the Key Laboratory of deposit geochemistry, Institute of geochemistry, Chinese Academy of Sciences. Among them, the main elements are analyzed by pw4400 X-ray fluorescence instrument, and the contents of 10 element oxides are determined; Trace elements are tested by ICP-MS inductively coupled plasma mass spectrometer. ICP-MS is manufactured by Agilent company in Tokyo, Japan, and the model is Agilent 7700x. The analysis method is the same as that of Zhang Xin, etc. According to the analysis results of standard sample gbpc-1de, the analysis error is less than 5%. MC-ICP-MS double focusing magnetic mass spectrometer with Neptune plus model is used for isotope test experiment. The test basis is GB / T 17672-1999.
The research on mixing different types of curing agents into debris flow siltation body has great engineering significance. It can not only make up for the deficiency of previous research on the curing characteristics of debris flow siltation body, but also provide a scientific basis for solving the difficulty of debris flow rescue and dredging the main traffic roads in time to a certain extent. In order to study the solidification characteristics of debris flow sediment, Central South University carried out indoor debris flow sediment solidification experiments to study the variation law of bearing capacity of debris flow sediment under the action of different types and different amounts of cement curing agent under the conditions of different gradation and different moisture content, so as to provide reference basis for better handling emergency rescue.
The abrasion characteristics of debris flow are the key parameters for the durability design of prevention and control engineering. In this project, 44 working conditions of 5 kinds of gravel gradation, 4 solid ratios, 3 kinds of slurry viscosity of debris flow, 2 kinds of debris flow velocity and 2 kinds of concrete strength are selected. The debris flow abrasion test is carried out with the self-developed debris flow abrasion test device to examine the concrete loss rate Changes of abrasion rate and surface morphology. The experimental results show that the loss rate and abrasion rate of concrete increase with the grading number of gravel (the content of large particle gravel increases), the solid ratio of debris flow and the viscosity of debris flow. According to the developed debris flow abrasion test device, the debris flow abrasion test of concrete materials is carried out, the debris flow abrasion test results are obtained, and the debris flow abrasion coefficients of different concrete materials are obtained
JIAO Pengpeng , SU Na , XU Linrong
Experimental data of impact force of debris flow block stone. The yield stress of impact medium, particle size of impact medium, impact force of block stone and other data produced by the impact force model test of debris flow block stone carried out in the State Key Laboratory of geological disaster prevention and geological environment protection; The data collection place is the State Key Laboratory of geological disaster prevention and geological environment protection of Chengdu University of technology. The data are obtained through the impact force model test of debris flow blocks. The main instruments used include HAAKE rotary rheometer mars40 / 60, HD camera, qsy8301-01 piezoelectric sensor, etc. the collection time is 2019-2021.
LIU Qinghua , SU Na , XU Linrong
The effects of different control factors such as clay content, width height ratio, upstream inflow flow and initial water content on the collapse of gully blocking landslide material source are studied. Through the analysis of the collapse process of weir plug body, the collapse modes of weir plug body are classified. This paper summarizes the longitudinal evolution law of dam body contour under different failure modes, calculates the flow depth, flow velocity and erosion rate, analyzes the temporal and spatial evolution process of dam body under different failure modes, discusses the effects of different factors on the gravity of dam break debris flow and peak discharge, and establishes the mathematical model of dam break discharge amplification coefficient of weir plug dam, Two plugging points in the study area and one plugging point in Ginkgo Pinggou are selected for verification, but there are some limitations in practical application due to the complexity of weir plug dam failure.
A large number of engineering practices show that the total amount of slope material sources and dynamic reserves account for a large proportion of the total amount of material sources in the basin, which is an important source of debris flow after the earthquake. Through the indoor model test, this paper analyzes the sensitive factors of slope material source rainfall start-up, compares and analyzes the estimation results of slope material source dynamic reserves by engineering experience method and RUSLE model, and reveals the influence of slope re greening herb vegetation on slope material source seepage field through numerical simulation analysis on the basis of indoor model test.
Aiming at the material source of "wide, gentle" and "narrow and steep" debris flow gully, based on field investigation and indoor rock and soil mechanical parameter test, this study uses indoor model experiment to study the starting mechanism of loose material in gully under different influencing factors. Through data analysis and fitting, the dynamic reserve model of gully provenance is established, which provides reference and scientific basis for the prediction, early warning and treatment engineering design of similar debris flow gully in earthquake area. The main conclusions are as follows: (1) The incipient erosion processes of deposits with different structural types are different: fine-grained soil appears rills at the front edge after the start of runoff at the rear, and gradually develops into pull grooves, which run through to the rear edge; After the runoff of coarse-grained soil starts, the front edge collapses and slides, showing the characteristics of traceability erosion; The upper fine and lower coarse soil first formed grooves at the boundary of soil layer and gradually extended to the rear edge; The upper coarse and lower fine soil first form a rill at the front edge, and the coarse soil in the back layer slides and scrapes the fine soil at the front edge. (2) At the moment of debris flow starting, coarse particles are mainly started in the form of sliding, jumping and rolling, and the starting and migration forms of coarse particles in fine-grained soil are mainly rolling and jumping; In coarse-grained soil, the coarse particles are mainly started by sliding; The confluence of upper fine and lower coarse soil is dominated by rolling and jumping in the early stage, and sliding in the later stage; The coarse particles in the upper coarse and lower fine soil start mainly by sliding. (3) The greater the rainfall intensity, the greater the runoff, and the stronger the undercutting erosion. The erosion curve tends to increase first and then decrease, and the maximum erosion depth generally appears at the place where the slope changes steeply and gently. (4) Based on the indoor simulation test results and fractal dimension theory, the evaluation model of "wide and slow" channel source dynamic reserves is established and verified.
The researchers of the research group carried out field investigation on the typical "wide and gentle" gully debris flow gully - Wenchuan Qipan gully and "narrow and steep" gully debris flow gully - Beichuan Qinglin gully branch. Through the field particle screening test of typical channel deposits in qipangou, and the qualitative and quantitative description of channel shape and typical channel section, it is found that the wide and gentle channel material source has the characteristics of "wide gradation, weak consolidation and easy stratification"; In addition, the debris flow accumulation samples of Qinglin gully branch gully are selected for on-site particle screening test, and the clay content, porosity and shear strength of the test soil samples are determined.
The photos include daily (2021.7.25-2021.8.6) scientific research disaster points and working photos, as well as the questionnaire of each disaster point (including landslide, collapse, debris flow, etc.), identify the disaster points recorded every day on the map, convert them into KMZ format, and analyze the distribution of disaster points in the scientific research area on GIS. The distribution of disaster points shows that there are fewer disaster points along the north line and in the scientific research county, while there are more disaster points along the south line and in the scientific research county. During the scientific research, wind sand points and mountain erosion points were found and recorded. Especially in the valleys and gullies around the Himalayas, disasters such as landslide and debris flow are easy to occur, while geological disasters are not easy to occur in the Qiangtang plateau area (plateau surface). The photos of disaster points can reflect the disaster characteristics of a region. They are intuitive data for studying local disaster types, and then have basic significance for local disaster types, distribution and disaster prevention and reduction measures.
ZHOU Qiang, NIU Baicheng , HUAQUE Cairang , LI Chunhua , ZHANG Shengpeng , MA Mingfu , GAO Haixin , CHEN Yingming , DING Yuanhui , GAO Yuan
The period of real-time monitoring of landslide data from 2020.6 to 2022.7, and the original monitoring data of Newton's geological disaster monitoring center is 2022-2020. Through the Newtonian force monitoring of 6 points, the real-time change of deep Newtonian force can be obtained in time, and the data can be fed back to the experimental analysis center synchronously. The analysis center draws the Newtonian force change curve synchronously, and the system can intelligently determine whether there is a landslide disaster in the measuring point area based on the landslide Newtonian force early warning criterion, In case of the sudden drop of Newtonian force, timely feed back to the local management department according to the change degree of sudden drop. This data can be used as a criterion for the occurrence of landslide, and the system can provide scientific guidance for the prevention and control of active fault landslide disasters.
1) Data content: this data set is the landslide disaster data of Sanjiang Basin in the southeast of Qinghai Tibet Plateau; 2) Data source and processing method: this data set was independently interpreted by Dai Fuchu of Beijing University of technology using Google Earth; This data file is finally formed by remote sensing interpretation - on-site verification - re interpretation - re verification and other methods after 7 systematic interpretation. More than 5000 landslides have been verified on site with high accuracy; 4) This data has broad application prospects for hydropower resources development, traffic engineering construction and geological disaster evaluation in the three river basins in the southeast of Qinghai Tibet Plateau.
The process of reconstructing the river blocking disaster chain in Yajiang river basin is of great significance to deeply understand the natural attributes and evolution law of ice river lake water landscape system in natural state. This data is the digital surface elevation model obtained in the process of scientific research. The data source is UAV tilt photography, which is corrected by real-time differential GPS (RTK) control points; The vertical resolution is 5cm and the horizontal resolution is 20cm. This data can be used to assist in identifying the spatial distribution of break flood sediments (break flood hills, gravel hills, Boulder core beach, etc.) in typical manqu river reach and the position of weir plug dam body, so as to obtain the section elevation. It is the first-hand data for restoring the scale of break flood.
ZHAO Zhijun , CAO Xilin
This data is the disturbance disaster data of 1:250000 major projects in the Qinghai Tibet Plateau. For the scope of disaster interpretation, line engineering (national highway, high-speed, railway and Power Grid Engineering) and hydropower engineering are bounded by the first watershed on both sides of the project; Mine, oilfield and port projects are bounded by 1km away from the project. Engineering disturbance disasters can be divided into two categories: ① landslide, collapse and debris flow disasters induced by engineering construction; ② For natural disasters that may affect the project, it is stipulated that all natural disasters within the above interpretation scope belong to category ② engineering disturbance disasters. The data includes the location, length, width, height difference, distribution elevation, genetic type, inducing factors, occurrence time, lithology and other elements of landslide, disaster related projects and project construction years. Based on Google Earth image and 1:500000 geological diagram, 6176 disaster points were interpreted; Google Earth is mainly used for disturbance disaster interpretation, and combined with field investigation to verify the interpretation results, ArcGIS is used to generate disaster distribution map; The data comes from Google Earth high-resolution images, with high accuracy of original data. In the process of generating disaster files, the interpretation specifications are strictly followed, and special personnel are assigned to review, so the data quality is reliable; Based on the collected data, the disaster risk analysis of the study area can be carried out to provide theoretical guidance for the smooth operation of the built projects and the construction of the line projects not built / under construction.
Dating data of debris flow and dammed lake sediments in complex mountainous areas from 2019 to 2021. The data collection sites are complex mountainous areas prone to debris flow in the eastern and southern edges of the Qinghai Tibet Plateau. The experimental analysis is mainly completed in the salt lake chemical analysis and testing center of Qinghai Salt Lake Research Institute of Chinese Academy of Sciences and the analysis and testing center of Chengdu Mountain Institute of Chinese Academy of Sciences. The instruments used include RIS ø TL / OSL – Da – 20 automatic luminescence instrument, etc. The age data set of debris flow sediments in typical complex mountainous areas is established, the formation age of debris flow sediments in complex mountainous areas is quantitatively studied, and the ancient debris flow disaster activity history in complex mountainous areas is determined.
The single mineral EPMA data set of magmatic rocks in the Himalayan orogenic belt is mainly based on the main data of single minerals in Jilong area, and the test points of single minerals are more than 200. The rock is light colored granite. The single minerals tested are mainly feldspar, garnet, muscovite and biotite. The single mineral electron probe uses cameca sxvivefe electron microprobe, etc. The data has not been published, and the data results are true and reliable. The testing units are mainly the Institute of geology, Chinese Academy of Geological Sciences and the Institute of mineral resources, Chinese Academy of Geological Sciences. The data set can be used to study the petrogenesis of leucogranite melts in the Himalayan orogenic belt.
ZENG Lingsen , GAO Lie , YAN Lilong