岩土力学2024，Vol.45Issue(1)：184-196,13.DOI:10.16285/j.rsm.2023.0048
双向渗流下考虑应力时空效应的组合桩复合地基固结理论研究
Theoretical study on consolidation of composite foundation with composite piles considering spatiotemporal effect of stress under bidirectional seepage
摘要
Abstract
The composite foundation with combined stone columns and impervious piles can not only improve the bearing capacity of the foundation,but also accelerate the consolidation of soil,which has a strong application value in treating saturated soft clay foundation.Based on the calculation model of axisymmetric consolidation with bidirectional seepage,a consolidation differential equation of composite foundation reinforced by stone columns and impervious piles is established by considering the volume compression of central and peripheral stone columns and the disturbance effect of piles construction.The analytical solution of the combined composite foundation consolidation under the variation of additional stress with time and depth is derived by using the analytical method,including the solutions of average excess pore water pressure of stone columns and soil and the average consolidation degree of composite foundation.The correctness of the solution is verified by degradation study and comparison with existing solutions.Finally,a smaller additional stress at the bottom of the composite foundation,or a denser distribution of stone columns and impervious piles,will lead to a faster consolidation of the combined composite foundation.The disturbance effect of stone columns construction on composite foundation is greater than that of impervious piles.Ignoring the effect of the volume compression of stone columns will overestimate the consolidation rate of composite foundation;the smaller the radius ratio is,the larger the error will be.A good agreement can be observed between the predicted consolidation degree by the theoretical solution and the measured one.关键词
复合地基/双向渗流/体积压缩/附加应力/解析解Key words
composite foundation/bidirectional seepage/volume compression/additional stress/analytical solution分类
建筑与水利引用本文复制引用
张玉国,杨文兵,赵雅纯,王闯,赵亚敏..双向渗流下考虑应力时空效应的组合桩复合地基固结理论研究[J].岩土力学,2024,45(1):184-196,13.基金项目
国家自然科学基金(No.U1204511,No.51509274) （No.U1204511,No.51509274）
河南省高等学校重点科研项目(No.19A560027) （No.19A560027）
河南省自然科学基金面上项目(No.222300420596).This work was supported by the Natural Science Foundation of China(U1204511,51509274),the Key Scientific Research Projects of Colleges and Universities in Henan Province(19A5 60027)and the Natural Science Foundation of Henan Province(222300420596). （No.222300420596）
