Three-dimensional artificial rainfall reservoir type landslide physical model testing equipment

Abstract

The invention provides three-dimensional artificial rainfall reservoir type landslide physical model testing equipment. The equipment comprises a box body, wherein the periphery and the bottom of the box body are sealed, the top of the box body is provided with an artificial rainfall system; a landslide bed is arranged in the box body; a landslide body is arranged on the landslide bed; the top end of the landslide bed is provided with a rear edge water complementing system for simulating ground water flow; a physical quantity test and control system is arranged in the landslide body; a TDR water testing system is arranged on one surface of the landslide body; a reservoir water level control system for controlling the water level in right front of the landslide body is arranged outside the box body; an exit gate is also arranged on the box body in right front of the landslide body. The testing platform system has the high integration and automation degrees, can be used for deformation damage model tests of a landslide under the action of a plurality of factors, and can perform the three-dimensional landslide physical simulation test research on landslide stability characteristic with the consideration of rainfall, reservoir water level rising and falling and coupling functions.

Description

technical field [0001] The invention belongs to the field of geological disaster model tests and specifically designs a three-dimensional artificial rainfall reservoir type landslide physical model test equipment. Background technique [0002] As a type of geomechanics model test, landslide model test can be divided into rock and soil according to the medium type, and its simulation technology can also be divided into two types accordingly. At present, the model test research at home and abroad mainly focuses on the simulation of rock materials. In terms of landslides, it has achieved great success, and its theory and application are becoming more and more mature; however, in addition to rock landslides, landslide model tests also include soil, gravel and other types, especially in the Three Gorges Reservoir area, where soil and gravel Landslides are more common. At present, the research on landslide model test technology for soil or gravel soil has just started at home and ...

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Problems solved by technology

[0003] 1) Soil or gravel soil is a fragmented material, and it is difficult to convert its self-weight stress level to 1 / n under the condition of maintaining its original physical and mechanical properties. Therefore, this test only partially satisfies the physical model and The geometric similarity and mechanical similarity between the prototypes cannot accurately reflect the overall characteristics of the prototype

[0004] 2) In soil research, especially in soft soil research, great progress has been made in failure model tests, but there are great difficulties in conducting conventional model tests in soft soil elastoplastic models and infiltration models considering the action of water media. Because in the ordinary gravity field, the model test scale is limited, but the stress level of each point in the model is still much lower than that of the prototype, and many stress-strain relationships of the soil, especially nonlinear relationships, cannot be truly reflected in the model. Mainly depends on the similarity of the model to similar materials and the reliability of data collection

According to the current research results at home and abroad, although the test methods have been greatly developed, there are great difficulties in the research of similar materials such as soft soils, which seriously restricts the development of geomechanics model test technology.

[0005] 3) Two-dimensional landslide model contact friction problem on both sides

[0006] 4) Research on the preparation of similar materials in landslide model tests is one of the difficulties in landslide models. At present, similar materials for rock landslides are basically solved with the gradual maturity of simulation technology for similar materials in gypsum series. The similar materials for soil landslides, especially soft soil Research has always been quite difficult

At present, in the similarity of soil similar material parameters, the similarity of the four factors such as bulk density, cohesion, internal friction angle, and elastic modulus can be satisfied, but when adding parameters such as permeability coefficient on this basis, the similarity can satisfy there are greater difficulties

[0007] 5) There are also many defects in the geotechnical centrifugal model test. First, the centrifugal inertial force field and the gravity field are not completely similar. The centrifugal inertial force field is proportional to the inertial radius. The acceleration of each point on the model is different, and the size and direction are changing. As a result, the geotechnical centrifugal model test cannot obtain a uniform force field, which is quite different from the actual engineering; secondly, the Coriolis acceleration generated during the feeding process will also cause errors in the centrifugal model; finally, the problem of acceleration and braking is also a problem of the centrifugal model test one

It takes a certain amount of time to increase and decrease the rotation speed until it stops, and the change of the force field caused by this is also inconsistent with the engineering practice, which has a great impact on the reliability of the test results

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