Excavation model test device for foundation pit excavation simulating ups and downs of pressurized water head

Abstract

The invention discloses a foundation pit excavation model testing device simulating lifting of an artesian head. The foundation pit excavation module testing device comprises a model box, a pressure-bearing superterranean layer, symmetrical surface soil baffle units, a foundation pit support structure, an artesian head adjustment system and a measurement system; the model box consists of a model box framework, tempered glass, a model box bottom plate, a reaction plate, a top frame and a model box base; the bottom of the model box is provided with the pressure-bearing superterranean layer which is connected with the artesian head adjustment system; the symmetrical surface soil baffle units are fixed on the model box framework through bolts; and the artesian head adjustment system consists of a water manometer, a Mariotte flask and a support. The foundation pit excavation model testing device can simulate lifting of the artesian head in a foundation pit excavation process, measures the water and soil pressure and deformation of the foundation pit under different artesian heads, and sorts relevant testing data and determines the foundation pit stress, the deformation development rule and the like; effective testing data support is provided for foundation pit problem research caused by the lifting of the artesian head; and a basis is provided for a subsequent theory analysis model.

Description

technical field [0001] The invention relates to a foundation pit model test device, in particular to a foundation pit excavation model test device under the condition of the pressure water head rising and falling, which can be used to simulate the pressure bearing layer and the overlying impermeable foundation pit soil when the pressure water head rises and falls The interaction between them, to study the water and soil pressure response and deformation of foundation pits under different confined water heads. Background technique [0002] In coastal and riverside areas where groundwater is abundant, engineering often faces the situation that there is still a bearing layer below the aquitard at the bottom of the deep foundation pit. Due to seasonal drought, seasonal changes in the water level of rivers or lakes, etc., the pressure bearing layer will be damaged. The pressure head rises and falls, which further affects the water and soil pressure, deformation and stability of t...

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Problems solved by technology

[0006] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a foundation pit excavation model test device for simulating the rise and fall of the pressurized water head, which solves the simulation problem of the rise and fall of the pressurized water head in the test, and can simulate the pressure-bearing layer and the pressure-bearing layer when the pressurized water head rises and falls. The interaction between the overlying impermeable foundation pit soil, measuring the water and soil pressure and deformation of the foundation pit under different confined water heads, sorting out the relevant test data and determining the development law of the force and deformation of the foundation pit under the confining water head provide effective experimental data support for the research on the foundation pit problem caused by the rise and fall of the confined water head, and provide a basis for the subsequent theoretical analysis model

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