Device for simulating foundation pit dewatering plane seepage and retaining wall deformation and using method

Abstract

The invention discloses a device for simulating foundation pit dewatering plane seepage and retaining wall deformation and a using method. A model box is divided into a soil box and a water tank through a transverse partition plate; a movable transverse foundation pit retaining wall is arranged in the soil box; the foundation pit retaining wall is connected with the front box wall and the rear boxwall of the soil box through telescopic water stop films and defines a foundation pit model with the outer side edge of the soil box; a dewatering well pipe is arranged in the foundation pit model; 2-4 observation well pipes are arranged in the soil box; a plurality of displacement sensors and water and soil pressure sensors are arranged in the soil box; and water in the water tank flows into thesoil box through the transverse partition plate. The method mainly comprises the steps of determining a simulation scheme and the position and size of a model, filling soil and installing equipment,setting an initial water level, simulating dewatering in a foundation pit, collecting and recording data, ending a test and recovering the water level. Simulation of seepage of the plane on one side of the foundation pit is achieved, and more time and labor are saved in the test process; and free deformation of an organic glass foundation pit retaining wall is achieved, and reappearance of retaining wall deformation in the foundation pit dewatering process is achieved.

Description

technical field [0001] The invention belongs to the technical field of foundation pit dewatering engineering, and in particular relates to a device and method for finely simulating seepage of foundation pit dewatering surface and deformation of retaining walls in scale model tests. Background technique [0002] With the development of urbanization, a large number of foundation pit projects have emerged, but at the same time many foundation pit collapses and uneven settlement or even destruction of buildings outside the pit have also appeared. Especially in areas with abundant groundwater, foundation pit precipitation can make the surrounding structure and pit The deformation of the external buildings cannot be ignored, and Zeng Chaofeng, Zheng Gang [1-2] found that precipitation before excavation of the foundation pit can cause cm-level deformation of the enclosure structure, and further induce the settlement of the ground outside the foundation pit and buildings through the...

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Problems solved by technology

[0003] Existing foundation pit dewatering test devices and methods mainly simulate three-dimensional seepage conditions, such as Shi Chenghua [3] designed the "indoor model test device for foundation pit dynamic dewatering under the condition of multiple aquifers". The model box is surrounded by a water supply interlayer to provide hydraulic recharge for each aquifer in the model. The situation of plane seepage is not considered, and the test process is time-consuming. It is labor-intensive, and the design and analysis of foundation pit precipitation rely more on the results of plane seepage analysis; for this reason, Wang Jianxiu [4-5] designed "a transparent soil test method and device for simulating underground seepage of foundation pit dewatering confined aquifers", which can simulate foundation pit dewatering surface seepage, but it mainly focuses on the law of groundwater seepage during foundation pit dewatering (such as, distribution and change of water level outside the foundation pit, etc.), and the retaining wall of the foundation pit in the device is fixed and cannot be deformed (it is understood that the reason why the retaining wall of the foundation pit is fixed is because it cannot solve the problem of the foundation pit during the test. The problem of external groundwater leaking into the foundation pit along the gap between the retaining wall of the foundation pit and the side wall of the model test box, so the colloid was simply filled in the gap of the side wall to block the water, but it also caused the retaining wall of the foundation pit fixed and unable to deform freely), so the deformation of the retaining wall and soil caused by seepage during the dewatering of the foundation pit cannot be truly reproduced

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