Underground diaphragm wall leakage detection method based on tracer agent

Abstract

The invention provides an underground diaphragm wall leakage detection method based on a tracer agent. The method comprises the following steps that a plurality of detection holes are formed in the two sides of an underground diaphragm wall; before foundation pit dewatering, two kinds of tracer solutions are arranged in a soil facing side measuring hole in a staggered mode, the concentration of tracers in an excavation side measuring hole is detected in the foundation pit dewatering process, and once the tracers are found in the excavation side measuring hole, it is indicated that leakage exists in the underground continuous wall in the corresponding range; the concentration and the distance between holes are detected according to the two tracers, the leakage horizontal position of the underground diaphragm wall is calculated, measuring holes are formed in the two sides of the position, the depth of the measuring holes in the soil facing side reaches the upper surface of the water-resisting layer, a third tracer is arranged in the holes, and whether leakage is located in the confined water layer or not is judged by detecting the concentration of the tracers in the measuring holes in the excavation side. The method has no influence on the integrity of the underground diaphragm wall, the test result is stable and easy to judge, the construction process is simple, the construction period is shortened, and the cost is not additionally increased.

Description

technical field [0001] The invention relates to the field of leakage detection of underground diaphragm walls of subway stations, in particular to a method for detecting leakage of underground diaphragm walls based on a tracer. Background technique [0002] With the vigorous development of my country's urban rail transit industry, the number of subway station projects is increasing day by day, and the underground diaphragm wall has been widely used as the main support form of subway stations. Nowadays, the depth of the connecting wall of the newly built subway foundation pit is large. Due to factors such as natural conditions, construction technology, and construction methods, the quality of the underground diaphragm wall is different. Leakage is prone to occur during the excavation of the foundation pit. In severe cases, piping, surrounding problems such as structural instability. Therefore, pre-determining the leakage location of the underground diaphragm wall and making ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a tracer-based underground diaphragm wall leakage detection method, which can avoid the integrity damage of the diaphragm wall caused by the traditional method, complicated construction technology, unstable detection results, Delay in construction period and increase in cost

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