Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (1): 295-302.doi: 10.13278/j.cnki.jjuese.201601307

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Leakage Detection in Waterproof Curtain of Soft Soil Foundation Pit

Meng Qingsheng1, Han Kai1, Liu Tao1, Gao Zhen2   

  1. 1. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, Shandong, China;
    2. Shandong Province Inv. & Surv. Institute of Urb. & Rur. Construction, Jinan 250031, China
  • Received:2015-04-20 Online:2016-01-26 Published:2016-01-26
  • Supported by:

    Supported by the Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Development Fund Project (KLE-TJGE-B1107) and the National Natural Science Fund Project (41202204)

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Abstract:

The leakage of waterproof curtain is a serious problem for the stability of soft soil foundation pit. In respect of the leakage detection methods of waterproof curtain, the numerical simulation and indoor physical model test were performed to verify the ability to determine the leakage position of the three different arrays of 3D resistivity methods and GPR method, and to discuss the anomaly characteristics in detecting profile. At the same time, the judgment of whether the waterproof curtain leak or not and the interpretation method of leakage position were also made. The research shows that:the resistivity method can reflect the existence of leakage position effectively by Wenner array, dipole-dipole array, and Wenner-Schlumberger array; it reveals high resistivity of soil inside foundation pit compared with that of outside the foundation pit without leakage of waterproof curtain; on the contrary, the resistivity will decrease at the bottom of saturation soil inside foundation pit, and it will increase outside the foundation pit and presents the funnel-shaped anomaly with leakage of waterproof curtain; using the cross point among the low resistivity anomalies and the curtain, we can also find the leakage position of waterproof curtain; in addition, there will show a hyperbolic reflection events in GPR detection profile after leakage of waterproof curtain, and we can also determine the leakage position through the vertex of the hyperbolic reflection. The results proved the feasibility of these two kinds of geophysical methods to carry out the leakage detection of waterproof curtain for soft soil foundation pit.

Key words: soft soil foundation pit, waterproof curtain, leakage detection, resistivity, GPR

CLC Number: 

  • P631.3

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