Model test device for foundation pit excavation under complex groundwater environment

Abstract

The invention discloses a foundation pit excavation model test device used in the complicated groundwater environment. The foundation pit excavation model test device comprises a model box, a water tank, symmetry-plane soil retaining units, a foundation pit supporting structure, a pressure-bearing empty space, a confined water pressure adjusting system and a measuring system, wherein the water tank is arranged at the upper right part inside the model box; the symmetry-plane soil retaining units are fixed on the model box; the pressure-bearing empty space is arranged at the bottom of the model box; the confined water pressure adjusting system comprises a miniature water pressure transmitter, an organic glass cylinder device and a flowmeter. According to the foundation pit excavation model test device, dynamic change of water table level and confined water pressure in a foundation pit excavation process can be simulated; water-soil pressure and deformation of a foundation pit under the action of dynamically changed water table level and confined water pressure are measured, related test data are disposed, the issues about foundation pit stress, deformation development rules and the like are determined, effective test data support is provided for research of foundation pit problems caused by complicated groundwater environment such as the dynamic change of the water table level and the confined water pressure and the like, and the basis is provided 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 complex groundwater environmental conditions such as dynamic changes in phreatic level and confined water pressure, which can be used to simulate dynamic changes in phreatic level and confined water pressure The interaction between the pressure-bearing layer and the overlying impervious foundation pit soil is studied, and the water-soil pressure response and deformation of the foundation pit under the condition of dynamically changing phreatic water level and confined water pressure are studied. Background technique [0002] There is abundant groundwater in the coastal and riverside areas, and the engineering often faces the situation that there is still a pressure-bearing layer below the aquitard at the bottom of the deep foundation pit. The dynamic changes of ground level and confined water pressure will further affect the...

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Problems solved by technology

[0006] In order to overcome the deficiencies in the prior art above, the present invention provides a foundation pit excavation model test device in a complex groundwater environment, which solves the simulation problem of the dynamic change of the phreatic level and the pressure of the confined water in the test, and can simulate the phreatic level and pressure. The interaction between groundwater and foundation pit soil when the water pressure changes dynamically, measure the water and soil pressure and deformation of the foundation pit under the action of the dynamically changing phreatic level and the pressure of the confined water, sort out the relevant test data and determine the phreatic level and pressure Problems such as the force and deformation development law of the foundation pit when the water pressure changes dynamically provide effective experimental data support for the study of foundation pit problems caused by complex groundwater environments such as dynamic changes in phreatic level and confined water pressure, and provide theoretical analysis models for later Provide evidence

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