Model test device for foundation pit excavation under the action of dynamic confined water

Abstract

The invention discloses a foundation pit excavation model test device under dynamic artesian water action, comprising a model casing, a bearing overhead layer, a symmetry plane retaining unit, a foundation pit support structure, an artesian pressure regulating system and a measuring system, wherein the model casing comprises a model casing frame, a reaction board and the like; the bearing overhead layer is arranged at the bottom of the model casing and connected with the artesian pressure regulating system; the symmetry plane retaining unit is fixed to the model casing frame through bolts; and the artesian pressure regulating system is composed of a micro water pressure transmitter, an organic glass cylinder device and a flowmeter. The foundation pit excavation model test device under dynamic artesian water action can be used for simulating dynamic variation of artesian water in the foundation pit excavation process, measuring pressure and deformation of water and soil in a foundation pit under dynamic artesian water action, disposing related test data and determining problems such as laws of stress and deformation development of the foundation pit, providing effective test data support for research on foundation pit problems caused by artesian water with dynamic variation, and providing reference for a later theoretical 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 dynamic change of confined water, which can be used to simulate the confined layer and the overlying weakly permeable foundation pit when the confined water changes dynamically The interaction between soils, to study the water and soil pressure response and deformation of the foundation pit under the action of dynamic confined water. Background technique [0002] In the coastal and riverside areas, groundwater is abundant, and the project often faces the existence of a confined layer below the impermeable aquifer at the bottom of deep foundation pits. The confined water of decompression wells, large rainfall, river flood peaks, and sea tide changes will cause the The confined water pressure of the confined layer changes dynamically, which further affects the water and soil pressure, deformation and stability ...

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Problems solved by technology

[0006] In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a foundation pit excavation model test device under the action of dynamic confined water, which solves the simulation problem of the dynamic change of the confined water in the test, and measures the excavation of the foundation pit under the action of dynamic confined water. The water and soil pressure and deformation of the water and soil, collate relevant test data and determine the stress and deformation development law of the foundation pit under the action of dynamic confined water, provide effective test data support for the study of foundation pit problems caused by dynamic changes of confined water, and Provide a basis for the subsequent theoretical analysis model

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