A single pile static load model test device and test method for ground subsidence in a mining area

Abstract

The invention discloses a mining area subsidence singe pile static load model test device and a test method. The device comprises a model slot of which the front of peripheral surface is transparent at least, wherein the slot bottom serves as a bearing plate; a sand leakage hole is formed in the slot bottom; a blocking orifice plate is arranged below the slot bottom and is used for blocking the sand leakage hole; the blocking orifice plate is supported by using a supporting column; a sand layer, a polyethylene film and a clay layer are sequentially paved in the model slot from the bottom upwards; a model pile is embedded in the clay layer; soil pressure boxes are embedded at the bottom and in the periphery of the model pile; a strain gage is arranged on the pile body; a loading device is arranged on the model top; the soil pressure boxes and the strain gage are connected to a data acquisition unit outside the model slot; and dial indicators are respectively arranged on the tops of the model pile and the clay layer. According to the test method disclosed by the invention, surface soil movement deformation rules in multiple mining areas can be accurately simulated, and the mining area surface deformation process under multiple geological conditions and different curvature change processes can be simulated.

Description

technical field [0001] The invention belongs to a test method in the construction field, in particular to a test method for surface subsidence in a mining area. Background technique [0002] Due to the rapid development of coal mining under the building, the surface soil in the mining area has subsided, and the bearing capacity of the foundation has changed to varying degrees, which has caused huge damage to the buildings within the mining area, such as railways and bridges in the mining area. The foundation will be affected to varying degrees. After the underground coal seam is mined, the original mechanical balance state inside the soil is changed, and the overlying strata will be deformed and damaged to varying degrees; when the mining area of ​​the underground coal seam reaches a certain range, the movement and deformation of the rock stratum will extend to the surface, making the surface The soil produces horizontal and vertical movement deformation. The surface soil ...

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Problems solved by technology

[0006] In order to overcome the fact that the existing surface subsidence simulation test cannot accurately simulate the settlement characteristics of the pile foundation during the mining area surface subsidence process, the present invention proposes a single pile static load model test device for the mining area surface subsidence, which can realize different situations. The simulation of various surface subsidence laws, including the simulation of surface positive and negative curvature subsidence laws, and the simulation of the process from positive curvature to negative curvature; and the subsidence can be stopped at any time to observe the experimental phenomenon; Test method for subsidence single pile static load model test device

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