›› 2014, Vol. 35 ›› Issue (6): 1617-1622.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Investigation of blocking effect on groundwater seepage of piles in aquifer

CAO Yi-wen1, 2，HUANG Run-qiu2，SHEN Shui-long1, 2，XU Ye-shuang1，MA Lei1   

  1. 1. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
  • Received:2013-03-21 Online:2014-06-10 Published:2014-06-20

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Abstract: The pile foundation of super-highrise buildings is generally installed into the deep sandy strata of confined aquifer. Deep excavation is generally conducted for the basement over the aquifer. In order to keep the stability of pit bottom, dewatering is required to conduct in the confined aquifer. Since there are a large number of piles in the dewatering pit in aquifer, the existing piles will affect the path of groundwater seepage. In order to reveal the mechanism of blocking effect of piles on groundwater seepage, laboratory tests are conducted. Polyvinylchloride (PVC) pipes and sand are employed to simulate pile and test soil, respectively. Test results show that piles show an obvious blocking effect on groundwater seepage; meanwhile the quantity and the layout form of piles will affect the blocking effect of piles. The effective media theory can be used to calculate the coefficient of permeability by considering the piles with rectangular layout. However, there is a difference of 20% with the quincunx layout, owing to the prolonged flow path. The formula to calculate the modified equivalent hydraulic conductivity is established based on the analysis of the flow path.

Key words: piles in sandy soil, laboratory test, groundwater seepage, blocking effect

CLC Number: 

  • TV 223.4
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