考虑桩土侧向变形的复合地基固结解  

Analytical solution for consolidation of composite ground considering lateral deformations of column and surrounding soil

作　　者：卢萌盟[1,2,3] 谢康和[2] 李传勋[2] 童磊[2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008 [2]中国矿业大学力学与建筑工程学院,江苏徐州221008 [3]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058

出　　处：《岩土工程学报》2011年第2期181-187,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51009135);中国博士后科学基金项目(20100481183);中国矿业大学青年科研基金项目(2009A008);深部岩土力学与地下工程国家重点实验室博士后基金项目(PD1003)

摘　　要：在竖向变形相等的条件下,同时考虑了桩、土在固结过程中发生竖向和侧向变形、土体中的径向和竖向渗流以及土体水平渗透系数的3种变化模式,给出了此类复合地基固结问题的解析解,并对该解和不考虑桩、土侧向变形的现有解答进行了比较,最后对地基的固结性状进行了参数敏感性分析。结果表明:考虑桩体的侧向变形会降低地基的固结速率;桩、土的泊松比越小,地基固结越快;考虑了桩、土的侧向变形后,复合地基的桩–土应力比虽然随固结逐渐增大,但与现有理论预测的不同,该应力比不会增长到桩-土模量比的值。Under the assumption of equal vertical deformation,an analytical solution is derived for the consolidation of composite ground by considering simultaneously the lateral and vertical deformations of column and soil,the vertical and radial flows in the surrounding soil and three variation patterns of the horizontal permeability coefficient of soil.The present solution is compared with some previous solutions ignoring the lateral deformations of column and soil.The consolidation behaviors of the composite ground are investigated by the analysis of parameter sensitivity.The results show that considering the lateral deformations will reduce the consolidation rate.The less the Poisson＇ ratios of column and soil are,the greater the consolidation rate is.When the lateral deformations of column and soil are considered,the column-soil stress ratio will keep increasing during the earlier stage of consolidation,but unlike that predicted by the traditional theory,it will not increase up to the value of compression modulus ratio of column to soil.

关 键 词：固结 复合地基 侧向变形 水平渗透系数 桩土应力比 

分 类 号：TU43[建筑科学—岩土工程]