Volume 35 Issue 4
Aug.  2021
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Article Navigation >  GEOTECHNICAL ENGINEERING TECHNIQUE  > 2021  >  35(4): 275-281
Liu Xiangyong, Long Yingying, Jing Xucheng, Hong Xiaoxing, Fan Dongdong, Tan Yong. Analysis of Single Well and Group Wells Pumping Tests for Deep Excavation in Water-rich Sand[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2021, 35(4): 275-281. doi: 10.3969/j.issn.1007-2993.2021.04.013
Citation: Liu Xiangyong, Long Yingying, Jing Xucheng, Hong Xiaoxing, Fan Dongdong, Tan Yong. Analysis of Single Well and Group Wells Pumping Tests for Deep Excavation in Water-rich Sand[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2021, 35(4): 275-281. doi: 10.3969/j.issn.1007-2993.2021.04.013
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Analysis of Single Well and Group Wells Pumping Tests for Deep Excavation in Water-rich Sand

doi: 10.3969/j.issn.1007-2993.2021.04.013
  • 1.

    Nantong Rail Transit Co., Ltd., Nantong 226000, Jiangsu, China

  • 2.

    College of Civil Engineering, Tongji University, Shanghai 200092, China

  • 3.

    Sichuan Academy of Building Research Co., Ltd., Chengdu 610081, Sichuan, China

  • Received Date: 2020-07-03
  • Publish Date: 2021-08-25
    Abstract
  • Water-rich sandy strata has the characteristics of low cohesion, poor stability, and strong permeability. Excavation construction in this strata can be risky. Hydraulic characteristics of this strata were studied to ensure the safety of construction. Based on the field pumping test and three-dimensional inversion analysis, the following conclusions are drawn: (1) The hydraulic connection between aquifers ③, ⑤1, ⑤2, and ⑤3 are not strong, and layers ④2, ⑤t and ⑤2 are poorly permeable. The influence radius of aquifers ⑤1 and ③ are 135 m and 52 m, respectively. (2) The hydraulic parameters of the main aquifers, including permeability coefficient, hydraulic conductivity and specific storage, were determined by numerical inversion. (3) The settlement caused by the group-well pumping in aquifer ⑤1 can rebound by about 25%; while the pumping-induced settlement of group-well pumping in aquifers ⑤2 and ⑤3 rebounds by more than 40%. At each stage of water level recovery, there is an obvious time lag of settlement rebound.

     

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