Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (6): 2354-2368.doi: 10.16285/j.rsm.2018.1409

• Geotechnical Engineering • Previous Articles     Next Articles

Optimization analysis of pile group foundation based on differential settlement control and axial stiffness under vertical loads

ZHANG Zhi-guo1, 2, ZHANG Rui1, HUANG Mao-song3, GONG Jian-fei4   

  1. 1. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China; 2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China; 3. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 4. Institute of Foundation Engineering, China Academy of Building Research, Beijing 100013, China
  • Received:2018-09-11 Online:2019-06-11 Published:2019-06-22
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51738010, 41772331) and the Projects of State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology(SKLGDUEK1707).

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Abstract: At present, the method of uniform isometric piles is used in most group pile designs. This method has major defects in foundation stress and deformation. Considering the increase of group pile foundation stiffness and reducing the differential settlement of group pile foundation, the group pile foundation displacement function is combined with the pile length optimization function. Under the method of line transformation and squared transformation, different group pile designs are determined by setting different pile length ratio ξ and connection curvature η. The scheme is used to analyze the variation law of axial stiffness ratio and differential settlement ratio of group pile foundation under different schemes. The reliability of theoretical analysis results is verified by finite element method. In addition, parametric analysis of axial stiffness ratio and differential settlement ratio of pile group foundations are based on different pile-soil stiffness ratios and different pile spacings. The results show that the optimal transformation mode of different pile groups and different pile lengths have different effects on the optimization results of group pile foundations. When the optimization purpose is to increase the pile group foundation stiffness, the optimization method of line transformation should be chosen. When the optimization purpose is to decrease the differential settlement of pile group foundation, the optimization method of squared transformation should be chosen. The axial stiffness of pile group increases with the increasing of pile-soil stiffness ratio and the decreasing of pile spacing. The differential settlement ratio of pile group decreases with the increasing of pile-soil stiffness ratio and the decreasing of pile spacing.

Key words: pile group, optimization of pile length, axial stiffness ratio, differential settlement ratio

CLC Number: 

  • TU 473.1
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