深厚软土水泥搅拌桩复合地基沉降分析及控制  

Analysis and control of the settlement in thick soft clay ground reinforced by deep mixing cement piles

作　　者：郝玉龙[1] 王立忠[1] 陈云敏[1] 陈胜乐 

机构地区：[1]浙江大学岩土工程研究所,浙江杭州310027 [2]温州浙大地基基础工程公司,浙江温州325000

出　　处：《岩土工程学报》2001年第3期345-349,共5页Chinese Journal of Geotechnical Engineering

摘　　要：深层水泥搅拌桩是处理深厚软土地基的有效方法。本文结合温州地区典型深厚软土 ,首先分析了采用水泥搅拌桩加固的4～ 8层建筑物地基的长期沉降观测结果 ,并用传统的方法进行了沉降计算 ,发现计算结果是实测结果的 3倍左右。然后 ,试验研究了典型温州软土的结构性 ,得出主要压缩层的土体结构屈服应力比在 1 7～ 2 5范围内 ,发现当下卧层的附加应力σz 与有效自重应力σz0 ′之和小于土体结构屈服应力σsy 时 ,建筑物沉降将得到有效控制。最后 ,在前人研究工作的基础上 ,提出考虑软土结构性的沉降计算方法 ,考虑土的结构性对下卧层沉降的影响 ,对 12幢不同层数的建筑物进行了沉降计算 ,计算结果与实测结果相当一致。Deep mixing cement pile is a effective method to reinforce thick soft clay ground.In allusion to the typical thick soft clay in Wenzhou,this paper analyses the chronically monitored settlement of 4～8 floor building's composite foundation reinforced by deep mixing cement piles,and calculates the settlement with traditional method,and find that calculated settlement is 2 times greater than monitored value.The structure characteristics typical soft clay is studied through experimentation,and the yield stress ratio of soil structure is found in the range of 1.7～2.5,and the settlement of building will be effectively controlled when the sum of superimposed stress and effective self weight stress is less than yield stress of soil structure in under lying soft layer.Finally, referring to other researchers' studies and in view of the influence of soil structure characteristics to the settlement of under lying soft layer, a new settlement calculation method has been put forward.With this method,settlement of 12 buildings are calculated and the calculated results are very close to the monitored results.

关 键 词：深厚软土 水泥搅拌桩 复合地基 沉降控制 

分 类 号：TU473.13[建筑科学—结构工程]