变荷载作用下CCSG桩复合地基固结分析  

Analysis on Consolidation of CCSG Pile Composite Foundation under Time-dependent Loading

作　　者：戚志博[1] 俞缙[1,2,3] 蔡燕燕[1,2,3] 郑春婷[1] 穆康[1] 

机构地区：[1]华侨大学岩土工程研究所,福建厦门361021 [2]福建省隧道与城市地下空间工程技术研究中心,福建厦门361021 [3]重庆交通大学(桥梁)结构工程重庆市重点实验室,重庆400074

出　　处：《地下空间与工程学报》2016年第2期336-342,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51308234);福建省高校新世纪优秀人才支持计划项目;福建省自然科学基金(2014J01160);重庆交通大学结构工程重庆市重点实验室暨桥梁结构工程交通行业重点实验室(重庆)开放基金(CQSLBF-Y11-2)

摘　　要：针对CCSG桩复合地基这种新型地基处理技术,研究了其在工程实际中常遇到的情况,即考虑土体水平渗透系数变化以及荷载逐渐施加的固结问题,建立了相应的数学模型,推导得到了固结一般解,并具体给出了单级等速加载情况下的特解,且荷载瞬时施加情况下的复合地基解析解为本文解的特例。通过计算分析得到加荷时间等参数对固结过程的影响曲线。结果表明:加载历时越长,强涂抹区范围越大,固结速度越慢。最后将实测数据反算,获得其固结度变化曲线,该曲线与本文理论获得的固结度变化曲线走势相似,可以验证本文解析解的正确性。A mathematical model for the problem of consolidation of CCSG pile composite foundation which was a new foundation treatment technology was presented,the analytical solution was given and the universal case in practical engineering was the consolidation under time-dependent loading and variation of coefficients of horizontal permeability. And the special case of the analytical solutions for composite foundation under instantaneous loading was given. The curves of the effect of some parameters such as the time on the consolidation process were presented based on calculating and analyzing. The results showed that the longer the loading time was,the larger the range of strong daubs area,the slower the consolidation would be. Results from back calculation of actual measurement show that the curve agrees with that from the analytical study,so the correctness of the analytical solution is verified.

关 键 词：复合地基 CCSG桩 变化荷载 固结 解析解 

分 类 号：TU470[建筑科学—结构工程]