Physical simulation test device for landslides under rainfall and reservoir water level coupling effects

Abstract

The invention discloses a physical simulation test device for landslides under rainfall and reservoir water level coupling effects. The physical simulation test device comprises an artificial rainfallsimulation unit, a model box unit and a monitoring unit; the rainfall unit is provided with a high-power water pump, a water storage well, a console, a desilting basin, a water returning tank and a numerical control water dividing valve; the periphery and the bottom of the model box unit are sealed, water control valves are arranged at the front end of the model box unit, heavy casters with brakes are arranged at the bottom of the model box unit, and a sliding bed is arranged in a box; a sliding belt is arranged on the sliding bed, a sliding body is arranged on the sliding belt, a water filter pipe is arranged at the rear edge of the sliding body, sensors are arranged on the sliding body and the sliding belt, and the front edge of the box is provided with liquid level meter, water inlet pipes and the water control valves; and the monitoring unit comprises a camera, a physical quantity sensor and a data acquisition and processing system. The physical simulation test device is used forsimulating deformation failure model tests of the landslides under multiple working conditions, the physical quantity parameters of different parts of the landslides can be monitored in real time, andthe landslides under the coupling effects of multi-parameters such as the rainfall and reservoir water level can be experimented and researched.

Description

technical field [0001] The invention relates to the field of geological disaster model tests, in particular to a landslide physical simulation test device for the coupling effect of rainfall and reservoir water level. Background technique [0002] In 2006, Yu Xiujing and others invented the geological environment simulation experiment device, including a frame, a water storage tank, and a simulation box whose downstream end is hinged to the frame, which can be used to simulate the formation and control of geological disasters and simulate the law of groundwater movement. [0003] In 2008, Luo Xianqi and others invented a large-scale landslide physical model test system under the action of rainwater, which mainly includes the model platform take-off and landing control system, indoor artificial rainfall control system, reservoir water level change control system, multi-physics measurement control system, non-contact displacement optical measurement The system and the Y-ray tr...

AI Technical Summary

Problems solved by technology

[0012] 1) Most of the landslide physical simulation devices in the past were designed with fixed frame structures and steel beam structures, which cannot realize the mobility of landslide models and are not conducive to the reuse of rainfall sites

[0013] 2) In the study of the deformation and failure mechanism of landslides, especially in the study of accumulation landslides, the research on the influence of geological structure models on the formation of landslides has made great progress. There are still big problems in the study of structural models

Previous test devices did not take into account the dual effects of cracks at the trailing edge of the landslide and weak interlayers on rainfall infiltration

[0014] 3) The temporal and spatial characteristics of the stress field and the groundwater flow field in actual engineering are relatively random, and the stress-strain relationship at different positions of the sliding body, especially the nonlinear relationship, cannot be truly reflected in the model. The test results mainly rely on the similar materials and data collection of the model reliability

Although the test methods have been greatly developed at present, there are still great difficulties in the study of similar materials for accumulations composed of loose rock-soil mixtures, which seriously restricts the development of geomechanical model test technology.

[0015] 4) The coupling effect of rainfall infiltration and reservoir water level change: Different from the landslide physical simulation test in which rainfall or reservoir water level acts alone, the slope deformation and failure mechanism under multiple mechanical effects is more complicated. The current research shows that this kind of rainfall The change of groundwater in the slope and the change of soil mechanical parameters caused by infiltration and reservoir water level change are the main control conditions of the model test

[0016] 5) Research on the preparation of similar materials for landslide models is one of the difficulties in landslide physical model tests. Rock-soil mixtures such as gravel and soil are natural products formed under certain historical conditions in nature. Currently, among the parameters of similar materials for loose accumulation landslides, bulk density, viscosity The similarity of the four factors such as cohesion, internal friction angle, and elastic modulus can be satisfied, but when the permeability coefficient is added on this basis, it is difficult to satisfy the similarity

[0017] 6) There are also many defects in the geotechnical centrifugal model test. The acceleration of each point on the model is different, and the size and direction are changing, so that the geotechnical centrifugal test cannot obtain a uniform force field, which is quite different from the actual project; The resulting Coriolis acceleration will also cause errors in the centrifugal test model, and it will take a certain amount of time to increase and decrease the rotation speed until it stops. The force field changes caused by this are also inconsistent with the engineering reality, which has caused serious damage to the reliability of the test results. great influence

Images