Device and method for measuring water pressure in stratum soil

Abstract

The device and method for measuring water pressure in stratum soil include two parts, a measuring part and a jacking rod. The front end of the measuring part is a conical tip, the rear part is a cylindrical shell, and the side of the cylindrical shell has a rectangular opening. The rear end of the measuring part is connected with the jacking rod. The rectangular opening is the hydraulic test area, which includes a protective net, a protective plate, a hydraulic test membrane, and a strain sensor from the outside to the inside. The main function of the protective net is to filter impurities in the soil layer, and the protective plate is mainly used to protect the hydraulic test membrane, which is connected with the subsequent strain sensor to measure the water pressure. The protective plate is opened during the hydrostatic test and closed after the test. The steps of the measurement method are: (1) jacking the measuring part to the depth of the soil where the water pressure needs to be measured. (2) Open the protective plate to measure the water pressure. (3) After the measurement is completed, close the protective cover and pull out the measuring device. (4) Block the water pressure measuring hole and clean the water pressure testing device.

Description

technical field [0001] The invention relates to the measurement technology of the water pressure in the stratum soil body. Background technique [0002] In the foundation construction process of underground engineering and other engineering nowadays, the problem of groundwater is often involved. Some groundwater infiltrates from the ground with low water pressure, while others are confined water with relatively high water pressure. For such formations containing confined water, it is often necessary to measure the water pressure within a certain depth of the formation before carrying out soil excavation and other constructions, and it is necessary to select a construction method or take certain measures according to the water pressure. Otherwise, once it is excavated, water inrush may occur, which will bring great trouble to the construction of the project. Therefore, it is very important to test the water pressure in the formation. However, at this stage, the hydraulic pr...

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Problems solved by technology

Otherwise, once excavated, water inrush may occur, which will bring great trouble to the construction, so it is very important to test the water pressure in the formation

However, at this stage, the hydraulic pressure test in the soil often adopts the method of open-cut and pre-embedded pressure boxes, which is neither practical nor effective, and cannot meet the requirements of pre-measurement of hydraulic pressure during engineering construction.

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