布袋注浆桩复合地基固结方程解析解  

Analytical Solution of Consolidation Equation of Composite Foundation Considering Bag Grouting Pile

作　　者：彭仪普[1] 汤致远 邓湘洋 李剑 李子超 PENG Yipu;TANG Zhiyuan;DENG Xiangyang;LI Jian;LI Zichao(School of Civil Engineering,Central South University,Changsha,China,410075)

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《沈阳建筑大学学报（自然科学版）》2023年第4期604-614,共11页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(52078499)。

摘　　要：目的解决传统地基处理方法对软土地基区域存在适用性差、效果不明显以及设计计算不准确等问题。方法通过分析布袋注浆桩复合地基加固机理,在现有复合地基固结研究的基础上,考虑因施工扰动而造成的土体水平渗透系数变化的三种可能模式,推导出布袋注浆桩复合地基固结控制方程,并根据固结解答采用解析方法对复合地基的固结度、孔压等问题进行多方面的分析。结果给出了布袋注浆桩复合地基固结控制方程以及复合地基在荷载瞬时施加和单级施加情况下的解析解;在相同计算条件下,散体材料桩、布袋注浆桩复合地基、不透水桩复合地基以及天然地基之间的固结速率表现为递减趋势。结论地基固结随着地基顶面和底面附加应力比值的增大而加快,且接近地表的附加应力越大固结越快。外部荷载瞬时施加,此时地基固结最快;加载历时越久,地基内的最大孔隙水压力值越小。Solve the problems of poor applicability,inconspicuous effect and inaccurate design calculation of traditional foundation treatment methods for soft ground areas.By analyzing the reinforcement mechanism of composite foundation with bag grouting pile,on the basis of the existing research on consolidation of composite foundation,three possible modes of soil horizontal permeability coefficient change due to construction disturbance are considered,the consolidation control equation of composite foundation with bag grouting pile is derived,and the consolidation degree and pore pressure of composite foundation are analyzed in many aspects by using analytical method according to the consolidation solution.The consolidation control equation of composite foundation with bag grouting pile and the analytical solution of composite foundation under instantaneous and single-stage application of load are given;under the same calculation conditions,the consolidation rate between bulk material pile,composite foundation with bag grouting pile,composite foundation with impermeable pile and natural foundation shows a decreasing trend.The consolidation of the foundation is accelerated with the increase of the ratio of additional stress at the top and bottom of the foundation,and the larger the additional stress near the surface,the faster the consolidation.The external load is applied instantaneously,when the foundation consolidation is the fastest;the longer the loading time,the smaller the maximum pore water pressure value in the foundation.

关 键 词：布袋注浆桩 解析解 水平渗透系数 复合地基固结 

分 类 号：TU447[建筑科学—岩土工程]