复合软土地基分层总和法沉降计算若干问题讨论  

Discussion on Some Problems of Layered Summation Method Settlement Calculation of Composite Soft Soil Foundation

作　　者：马勤 张玉山 MA Qin;ZHANG Yushan(Wuhan Geological Prospecting and Foundation Engineering Co.,Ltd.;Hubei Geological and Mineral Construction Survey Co.,Ltd.)

机构地区：[1]武汉地质勘察基础工程有限公司 [2]湖北地矿建设勘察有限公司

出　　处：《现代矿业》2023年第12期103-107,111,共6页Modern Mining

基　　金：湖北省地质局科技项目(编号:KJ2019-35)。

摘　　要：复合软土地基沉降计算最常用的方法为分层总和法,通过总结国内外研究现状,针对分层总和法在工程设计与施工过程中存在若干问题进行讨论与分析。主要讨论了复合软土地基分层总和法压缩模量的计算、沉降经验系数的选取以及软土固结度等方面的问题。对于复合软土地基压缩模量应着手研究其与桩土应力、桩端承载效应、应力扩散效应等之间的关系,软土层压缩模量把握分层计算是关键。沉降经验系数应从理论寻找新的方向代替,或基于理论突破并结合监测数据反演得出更为符合区域的沉降经验系数。软土固结度的研究应充分结合室内试验和现场预压试验等,获取压缩系数和渗透系数等参数的时空演化规律,进一步研究软土地基的固结原理。The most commonly used method for settlement calculation of composite soft soil foundation is the layered summation method.By summarizing the research status at home and abroad,some problems in the engineering design and construction process of the layered summation method are discussed and analyzed.The calculation of the compression modulus of the layered summation method of composite soft soil foundation,the selection of the settlement empirical coefficient and the consolidation degree of soft soil are mainly discussed.For the compression modulus of composite soft soil foundation,the relationship between pile-soil stress,pile-end bearing effect and stress diffusion effect should be studied.It is the key to grasp the layered calculation of soft soil compression modulus.The empirical coefficient of settlement should be replaced by the theory to find a new direction,or based on the theoretical breakthrough and the inversion of monitoring data to obtain the empirical coefficient of settlement that is more in line with the region.The study of soft soil consolidation degree should be fully combined with laboratory test and field preloading test to obtain the temporal and spatial evolution law of parameters such as compression coefficient and permeability coefficient,and further study the consolidation principle of soft soil foundation.

关 键 词：复合软土地基 分层总和法 沉降计算 

分 类 号：TU447[建筑科学—岩土工程] TU433[建筑科学—土工工程]