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将软黏土中桩体贯入过程看作不排水条件下圆柱孔的扩张.弹性和塑性区分别采用小应变和大应变理论,考虑传统超固结比与各项同性超固结比的不同,推导了修正剑桥模型土中单桩挤土位移的解析解;并与文献离心模型试验结果进行了比较,验证了理论解答的可靠性.在此基础上,采用叠加原理对排桩的侧向挤土位移进行了估算,并分析了沉桩数目、桩间距、预钻孔孔径以及土体超固结比对侧向挤土位移的影响规律.研究结果表明,随着沉桩数目的增加,挤土影响范围增大;当桩间距、预钻孔孔径增大时,挤土位移快速减小;土体超固结比增加时,侧向挤土位移略有增加,但总体影响不明显.
Considering the penetration of pile body in soft clay as the expansion of cylindrical hole under undrained condition, the theories of small strain and large strain are respectively adopted in the elastic and plastic zones. Considering the difference between the traditional overconsolidation ratio and the same-sex overconsolidation ratio, The analytical solutions of the displacement of a single pile in the Cambridge model soil are deduced and compared with the centrifugal model tests in the literature to verify the reliability of the theoretical solution.On this basis, The displacement of soil was estimated, and the influence rule of the number of pile sinking, the distance between piles, the pre-boring hole diameter and the over-consolidation ratio of soil on lateral displacement was analyzed.The results show that with the increase of the number of pile sinking, When the pile spacing and pre-drilled hole diameter increase, the displacement of squeezed soil decreases rapidly. When the overconsolidation ratio of soil increases, the displacement of lateral squeezed soil slightly increases, but the overall impact is not obvious.