›› 2015, Vol. 36 ›› Issue (4): 1167-1173.doi: 10.16285/j.rsm.2015.04.034

• Geotechnical Engineering • Previous Articles     Next Articles

Deformation analysis for the end-suspended piles in the combined soil-rock foundation pits under moving loadings

BAI Xiao-yu1, 2，ZHANG Ming-yi1, 2，YUAN Hai-yang3   

  1. 1. College of Civil Engineering, Qingdao Technological University, Qingdao, Shandong 266033, China; 2. Collaborative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao Technological University, Qingdao, Shandong 266033, China; 3. Qingdao Yijing Design Co., Ltd., Qingdao, Shandong 266000, China
  • Received:2014-10-30 Online:2015-04-11 Published:2018-06-13

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Abstract: Based on the unique feature of the combined soil-rock geological conditions in Qingdao, Shandong province, the deformation and dynamic responses of the end-suspended piles for foundation pits in the combined soil-rock foundation pits under gantry crane moving loads are studied by using the finite element code, Plaxis, and field monitoring. The results indicate that the numerical predictions agree well with the measured deformations of the pre-bored pile shaft, and the major deformation of foundation pit occurs in the soft soil strata in rocky area, whereas the stress concentration occurs at the rock-socketed part of the end-suspended piles. In addition, under the gantry crane moving loads, the horizontal displacement of the pile head is larger, and its dynamic response is the least pronounced, whereas the horizontal displacement of the rock-socketed part is smaller and its dynamic response is the most significant. At the rock-socketed part, maximum positive bending moment part and maximum hogging moment part, the dynamic responses of earth pressure are the most pronounced, and the largest response occurs as a moving load passes by. The results can provide reference for the deep foundation pit supporting design in similar geological conditions.

Key words: moving loads, soil-rock combination excavation, end-suspended piles, dynamic response, finite element method (FEM)

CLC Number: 

  • TU 473
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