CSM工法在深厚饱和砂土地基的现场试验研究  

Field test study of CSM method on deep saturated sand foundation

作　　者：李汉龙 李学军 曾开华[1] 崔猛[1] 刘海林 LI Hanlong;LI Xuejun;ZENG Kaihua;CUI Meng;LIU Hailin(School of Civil and Architectural Engineering,Nanchang Institute of Technology,Nanchang 330099,China;China Nerin Engineering Co.,Ltd.,Nanchang 330031,China)

机构地区：[1]南昌工程学院土木与建筑工程学院,江西南昌330099 [2]中国瑞林工程技术股份有限公司,江西南昌330031

出　　处：《南昌工程学院学报》2021年第1期45-50,共6页Journal of Nanchang Institute of Technology

基　　金：国家自然科学基金资助项目(51769016);江西省自然科学基金资助项目(2014BAB206001);江西省教育厅科学技术研究项目(GJJ151117).

摘　　要：以南昌苏宁广场项目基坑工程为背景,在深厚饱和砂土地层条件下,开展3次现场等厚度水泥土搅拌墙(CSM工法)试验,通过施工工艺和施工参数多次调整,得到了该工程地质条件下的施工参数。试验结果表明试验墙养护28 d墙体抗压强度为1.4MPa,试验抗压强度超过设计抗压强度75%;在深厚中砂和砾砂层抗渗系数由0.133cm/s提高了5个数量级,达到4.3×10^(-6)cm/s;试验墙施工对周边环境影响很小,地表最大沉降位移为11.3mm,最大侧向位移为24mm,各项指标均满足设计要求,取得预期防渗加固效果。说明现场试验采用的CSM施工工艺和施工参数是有效适用的,可作为该深基坑工程的防渗加固措施施工采用,并为同类工程推广应用提供科学依据和借鉴参考。Taking the foundation pit project of Suning Plaza project in Nanchang as the background, under the conditions of deep and saturated sand soil layer, three on-site tests of equal thickness cement-soil mixing wall(CSM construction method)were carried out, and the project was obtained through multiple adjustments of the construction process and construction parameters.Through adjusting construction techniques and construction parameters, we obtain the construction parameters under special geological condition.The test results show that the compressive strength of the wall for the 28-day maintenance of the test wall is 1.4 MPa, and the compressive strength of the test exceeds the design compressive strength by 75%;that the permeability coefficient of the deep and medium sand and gravel sand layer is increased by 5 magnitude orders from 0.133 cm/s to 4.3×10^(-6)cm/s;that the construction of the test wall has little effect on surrounding environment, the maximum settlement displacement of the ground surface is 11.3 mm, and the maximum lateral displacement is 24 mm.All the indexes meet the design requirements and achieve the expected anti-seepage and reinforcement effect.It shows that CSM construction technology and construction parameters used in the field test are effective and applicable, and can be used as the anti-seepage and reinforcement measures for the deep foundation pit project, and provide a scientific basis and reference for the promotion and application of similar projects.

关 键 词：深基坑 CSM工法 现场试验 止水帷幕 

分 类 号：TU473.2[建筑科学—结构工程]