低标号混凝土芯砂石桩复合地基固结计算方法  

STUDY ON CONSOLIDATION CALCULATION OF LOW-GRADE CONCRETE-CORED SAND-GRAVEL PILE COMPOSITE FOUNDATION

作　　者：俞缙[1,2] 戚志博[1,2] 蔡燕燕[1,2] 关云飞[3] 

机构地区：[1]华侨大学岩土工程研究所,福建厦门361021 [2]重庆交通大学(桥梁)结构工程重点实验室,重庆400074 [3]南京水利科学研究院岩土工程研究所,江苏南京210024

出　　处：《工程力学》2012年第6期218-223,240,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(51109084);福建省自然科学基金项目(2011J01317);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开放基金项目(CQSLBF-Y11-2);泉州市科技计划项目(2010Z81)

摘　　要：针对低标号混凝土芯砂石桩复合地基这种软土地基处理新工法,建立了相应的考虑双面半透水边界条件固结计算模型;同时为考虑下卧层与加固区的孔压连续问题,基于双层散体材料桩复合地基固结理论和低标号混凝土芯砂石桩复合地基的特点,将低标号混凝土芯砂石桩复合地基固结问题转化为等效双层地基固结问题,采用解析法推导计算公式并得到相应的解析解。两种模型得到的超静孔压消散规律、固结度随时间增长规律与由现场实测数据推导出的规律相似,验证了本文提出的加固区模型和双层地基法在低标号混凝土芯砂石桩复合地基固结计算中的可行性和适用性。A low-grade concrete-cored sand-gravel pile composite foundation was a new sort ground improvement method. A consolidation calculation model considering impeded boundary conditions was presented While considering the hole pressure continuous problem of an overlying soil layer and a reinforce field, according to consolidation theory of double-layered soft clay composite ground, the consolidation problem of a low-grade concrete-cored sand-gravel pile composite foundation is translated into a consolidation problem of an equivalent double-layered foundation, and corresponding analytical solutions are solved .The comparison between the calculated results and the filed measured data showed that the calculated excess pore water pressure, the consolidation degree and the settlement-time relationship were consistent with those of filed data respectively.

关 键 词：低标号混凝土芯砂石桩 复合地基 固结 计算模型 软土地基处理 

分 类 号：TU433[建筑科学—岩土工程] TU473.1[建筑科学—土工工程]