Stability test device for foundation pit bottom containing confined water layer

Abstract

The invention relates to a stability test device for a foundation pit bottom containing a confined water layer. The device comprises a model box, an enclosure plate and a pressurization system, wherein the enclosure plate is located in the model box; a pressurization cabin surrounds the model box; a test soil body is paved in the model box; the lower part of the enclosure plate is located in the test soil body; a surface layer of the test soil body in the enclosure plate is a monitoring layer; a data acquisition system is arranged on the monitoring layer; in the pressurization system, the pressurization cabin surrounds the model box; a water inlet pipe and an air valve are arranged on the upper part of the pressurization cabin; a water outlet is formed in the lower part of the pressurization cabin; the water inlet pipe is sealed by a sealing nut; the air valve is connected with an air pump; an inverse filtering plate for enabling water to permeate into the model box and preventing the test soil body from entering the pressurization cabin is arranged on the lower part of the model box; a water level of the pressurization cabin is higher than the top part of the inverse filtering plate; the lower part of the enclosure plate is higher than the top part of the inverse filtering plate. The invention provides the stability test device for the foundation pit bottom containing the confined water layer, which has the advantages of good effect, convenience in operation, short construction time and low cost.

Description

technical field [0001] The invention relates to a foundation pit bottom stability testing device containing a confined water stratum, which is mainly applicable to the research on the influence of foundation pit bottom stability under different water pressure conditions of a pressure-bearing layer in an indoor test, and belongs to the technical field of engineering tests . Background technique [0002] The development of underground space is an important trend of urban development, and this cannot be separated from the excavation and enclosure of foundation pits. During the excavation of the foundation pit, due to the gradual decrease of the soil pressure on the upper part of the pit bottom, under the action of the pressurized water below the bottom of the foundation pit, it is easy to cause engineering accidents such as pit bottom uplift and inrush, and the greater the depth of the foundation pit , the problem is more serious. In order to evaluate the stability of the fou...

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Problems solved by technology

[0003] In order to overcome the deficiencies of the existing foundation pit bottom stability evaluation methods, such as complex procedures, high cost, and long construction period, the present invention provides a foundation pit containing confined water stratum with good effect, convenient operation, short construction period, and low cost Bottom Stability Test Device

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