Sonar seepage detection method for underground diaphragm wall near subway deep foundation pit

Abstract

The invention relates to the technical field of foundation pit construction engineering, in particular to a sonar seepage detection method for an underground diaphragm wall near a subway deep foundation pit, which comprises the following steps of: S1, arranging detection holes, and excavating a plurality of detection holes in the outer side, near a subway, of the underground diaphragm wall according to drawing requirements; s2, detection pipes are arranged, the detection pipes are placed in the detection holes respectively, and water permeable holes are formed in the pipe walls of the detection pipes; s3, underground water in the foundation pit is extracted; s4, detection is conducted, specifically, detection equipment is placed in the detection pipe for detection, data of the equipment are observed, and a three-dimensional flow velocity vector measuring instrument is adopted as the equipment; and S5, analysis: analyzing the position of the leakage point of the continuous wall according to the detected data, and performing plugging. The method has the effect of improving the judgment accuracy and efficiency of the leakage position of the underground diaphragm wall.

Description

technical field [0001] The present application relates to the technical field of foundation pit construction engineering, in particular to a sonar seepage detection method for an underground diaphragm wall of a deep foundation pit adjacent to a subway. Background technique [0002] At present, with the continuous development of urban construction in our country, the pavement space resources have been developed and utilized on a large scale, and with it, the demand for the development and utilization of underground space is constantly increasing. In recent years, with the gradual increase of urban underground space projects, especially the rapid development of subway projects, the requirements for the construction of underground diaphragm walls are also increasing. Many complex geological conditions are often accompanied by abundant groundwater, which will have a huge impact on engineering construction. Improper handling will lead to dangerous situations such as road surface ...

AI Technical Summary

Problems solved by technology

[0003] The traditional investigation method for the seepage of the underground diaphragm wall is generally to rely on the water level observation well set outside the foundation pit to observe the water level elevation difference in the water level observation well. situation, which is not conducive to the safety of the foundation pit

[0004] In recent years, with the development and application of the sonar method in the detection of groundwater seepage, it has been possible to detect the seepage of groundwater through related instruments. However, there is still a lack of analysis methods for judging and evaluating the overall permeability of underground diaphragm walls. This will make it difficult to make the most appropriate construction method for the overall penetration of the underground diaphragm wall, which will affect the construction of buildings in the foundation pit, and will also affect the construction of the subway, resulting in greater economic cost losses

Images