Method for testing stability of pit bottom of foundation pit with confined water stratum

Abstract

The invention provides a method for testing the stability of the pit bottom of a foundation pit with a confined water stratum. The method for testing the stability of the pit bottom of the foundation pit with the confined water stratum comprises the following steps that (1) the shape and size of an enclosure plate are determined; (2) the depth and thickness of the foundation pit are determined; (3) soil layers are laid layer by layer, and the enclosure plate is buried; (4) a monitoring network is partitioned; (5) a data acquisition system is mounted; (6) water is added through a water inlet, so that the water level is made higher than the position of an inverse filtering plate; (7) the tested maximum water pressure value is determined according to the water pressure of an actual pressure bearing layer; (8) the air pressure loading level is determined; (9) the air pressure is loaded; (10) data are measured and recorded by the data acquisition system; (11) the air pressure on another level is adjusted, and data are measured and recorded; (12) loading is stopped when seepage destruction starts to occur on the bottom surface of the pit; and (13) a relational graph between the water pressure and deformation of the pit bottom is drawn. According to the method for testing the stability of the pit bottom of the foundation pit with the confined water stratum, the effect is good, operation is convenient, the construction period is short, and the cost is low.

Description

technical field [0001] The invention relates to a method for testing the stability of foundation pit bottoms containing pressurized water formations, which is mainly applicable to the research on the influence of foundation pit bottom stability under different water pressure conditions of pressure-bearing layers in indoor tests, 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 stabili...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the existing method for evaluating the stability of the bottom of foundation pits, 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 method

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