Foundation model test device for simulating the rise and fall of pressurized water head

Abstract

The invention discloses a foundation model test device for simulating lifting and dropping of a confined water head. The foundation model test device comprises a model box, a pressure-bearing empty space, an confined water head regulating system, a sensor fixing device and a measurement system, wherein the pressure-bearing empty space is arranged at the bottom of the model box and connected with the confined water head regulating system; lifting and dropping of the confined water head in the model box are controlled through regulation of a Mariotte flask of the confined water head regulating system; the measurement system comprises a miniature pore water pressure sensor, a miniature earth pressure cell, a multi-channel data acquisition instrument and a digital camera. According to the foundation model test device for simulating lifting and dropping of the confined water head, interaction between the pressure-bearing layer and an overlying foundation soil body with weak water permeability during lifting and dropping of the confined water head can be simulated; water and earth pressure and deformation of the foundations under different confined water heads are measured, related test data are disposed, the issues of foundation stress and deformation development laws and the like are determined, effective test data support is provided for research of the foundation issues caused by lifting and dropping of confined water, and the basis is provided for a later theoretical analysis model.

Description

technical field [0001] The invention relates to a foundation model test device, in particular to a foundation model test device under the condition of pressure-bearing water head rise and fall, which can be used to simulate the interaction between the pressure-bearing layer and the overlying impermeable foundation soil when the pressure-bearing water head rises and falls , to study the water and soil pressure response and deformation of the foundation under different confined water heads. Background technique [0002] In the coastal and riverside areas, not only is the groundwater abundant, but the foundation soil layer is often distributed in interlayers between strong and weakly permeable layers. During engineering, there are often confining layers below the impermeable layer at the bottom of deep foundation pits, and the action of confined water causes The deformation and instability of foundation pits are one of the major risk sources of deep foundation pit engineering i...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a foundation 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 overlying weak points when the pressurized water head rises and falls. Interaction between permeable foundation soils, measurement of water and soil pressure and deformation of foundations under different confined water heads, collation of relevant test data and determination of stress and deformation development laws of foundations under confined water head fluctuations, etc. Provide effective test data support for the study of foundation problems caused by water ups and downs, and provide a basis for subsequent theoretical analysis models

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