Influences of compaction effect on bearing capacity of laterally loaded piles in sand
HU Kai1, SU Dong1, 2, YU Zhong-liang3, HUANG Jun-jie1, PANG Xiao-chao2, 4
1. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; 2. Underground Polis Academy, Shenzhen University, Shenzhen 518060, China; 3. Country Garden Co., Ltd., Huishen Regional, Huizhou 516347, China; 4. Shenzhen Research and Design Institute of China Academy of Railway Sciences, Shenzhen 518000, China
Abstract：Displacement piles are widely adopted in practical engineering. Some of the piles are used to resist the horizontal cyclic loadings induced by wind or wave. Based on the model tests conducted on open-end and closed-end piles, the effects of the initial relative density of sand, pile diameter and length-diameter ratio on the static and cyclic bearing capacities are investigated. The results indicate that the bearing capacity of the open-end piles is generally weaker than that of closed-end piles in both loose and medium-dense sands. Difference in the pile diameter, length-diameter ratio, and relative density of sand will result into significant difference in the bearing capacities of the open-end and closed-end piles. Under cyclic loading, the bearing capacity of the piles in loose sand always increases with the number of loading cycles. In the medium dense sand, the increment in the loading capacity as caused by the cyclic loading is smaller than that in the loose sand, and becomes negative in some cases.
胡铠, 苏栋, 余中良, 黄俊杰, 庞小朝. 挤密效应对砂土中水平受荷桩承载特性的影响[J]. 岩土工程学报, 2019, 41(S2): 213-216.
HU Kai, SU Dong, YU Zhong-liang, HUANG Jun-jie, PANG Xiao-chao. Influences of compaction effect on bearing capacity of laterally loaded piles in sand. Chinese J. Geot. Eng., 2019, 41(S2): 213-216.
[1] VESIC A S.Expansion of cavities in infinite soil mass[J]. Journal of the Soil Mechanics and Foundation Division, ASCE, 1972(3): 203-208. [2] LEHANEL B M, GAVIN K G.Base resistance of jacked pipe piles in sand[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2001, 127(6): 473-480. [3] YASUFUKU N.& HYDE A.F.L. Pile end-bearing capacity in crushable sands[J]. Géotechnique 1995, 45(4): 663. [4] 苏栋. 水平(椭)圆形加载路径下的单桩模型试验研究[J]. 岩土工程学报, 2011, 33(5): 738-745. (SU Dong.Experimental study on a single pile under horizontal elliptical/circular loading[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(5): 738-745. (in Chinese)) [5] SU D, YAN W M.A multidirectional p-y, model for lateral sand-pile interactions[J]. Soils and Foundations, 2013, 53(2): 199-214. [6] 王小龙, 刘益平, 龚维明, 等. 砂性土中钢管桩水平承载特性模型试验研究[M]// 第十三届全国桩基工程学术会议. 2017: 178-183. (WANG Xiao-long, LIU Yi-ping, GONG Wei-ming, et al.Small-scale model tests of lateral bearing capacity of steel pipe pile in sand[M]// Papers Collection of the Thirteenth National Symposium on pile Foundation Engineering, 2017: 178-183. (in Chinese))
