低标号混凝土芯砂石桩复合地基固结一般解

CCSG桩(低标号混凝土芯砂石桩)复合地基是一种新型多元复合地基，为研究其固结性状，基于等应变假设和应力集中效应，建立可考虑涂抹区水平渗透系数变化、砂石壳内径向渗流和混凝土芯桩不排水特点的固结分析模型，推导了CCSG桩复合地基固结一般解。现有的Terzaghi一维固结解和普通复合地基固结解是该文解的特例。根据该文理论公式编制计算程序，获得了在涂抹区水平渗透系数3种变化模式下和各无量纲参数变化时，CCSG桩复合地基的平均固结度曲线。分析结果表明:涂抹区水平渗透系数变化和各无量纲参数的变化对CCSG复合地基固结影响显著。通过和由实测数据获得的固结度曲线对比，验证了该文理论解的正确性。

STUDY ON THE GENERAL solution for THE consolidation of LOW-GRADE CONCRETE-CORED SAND-GRAVEL pile composite foundation

Based on the assumption of equal strain and stress concentration effect, a model was built to study the consolidation behaviors of CCSG (low-grade concrete-cored sand-gravel) pile composite foundation, which is a new multi-component composite foundation. The coefficients of the horizontal permeability in the smear zone, the radial flow inside the sand-gravel shell and the undrained property of concrete-cored pile were taken into account to derive the general analytical solution for consolidation. The results show that the Terzaghi one-dimensional consolidation solution and the consolidation analytical solution of ordinary composite foundation were special cases of this solution. Curves of the average consolidation degree of the composite foundation under three horizontal permeability coefficients in the smear zone and various non-dimensional parameters were observed using the program based on the theoretical formula. The analyzed result shows that the consolidation of composite foundation was largely effected by the changes in the horizontal coefficients of permeability in the smear zone and non-dimensional parameters. The analytical solution was finally validated with the actual measurement data.