SMW工法桩紧邻建筑物跳仓施工优化数值分析  

Numerical Analysis on Optimization of Skip Construction of SMW Pile Adjacent to Buildings

作　　者：魏晨亮 林超 姜蓉 肖树聪 赵宝锋[5] WEI Chenliang;LIN Chao;JIANG Rong;XIAO Shucong;ZHAO Baofeng(China Railway(Guangzhou)Investment and Development Co.Ltd.,Guangzhou 510000;Physical Science and Technology College,Yichun University Yichun 336000;State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013;Jiangxi Fengqiang Technology Development Co.Ltd.,Yichun 336000;China Railway Tunnel Group Second Division Co.Ltd.,Langfang 065201)

机构地区：[1]中铁(广州)投资发展有限公司,广州510000 [2]宜春学院物理科学与工程技术学院,江西宜春336000 [3]华东交通大学轨道交通基础设施性能监测与保障国家重点实验室,南昌330013 [4]江西丰强科技发展有限公司,江西宜春336000 [5]中铁隧道集团二处有限公司,河北廊坊065201

出　　处：《土工基础》2024年第4期674-680,共7页Soil Engineering and Foundation

基　　金：江西省自然科学基金面上项目(20232BAB204074);中国博士后科学基金面上项目(2023M741158)。

摘　　要：SMW工法桩因其施工速度快、堵水性能好的优势,在软土基坑工程中广为应用,但传统SMW工法的连续施工在水泥土硬化前期,易诱发紧邻建筑物地层的扰动,周边建筑物的安全性难以得到保障。以南昌地铁3号线六眼井站富水软土地层深基坑工程为例,基于数值方法建立了SMW工法桩按连续施工和跳仓施工两种计算工况,对比分析不同工况下SMW工法桩施工引起的周边地层力学响应,通过建立不同施工长度和跳仓间距下的数值模型,结合现场施工条件和施工效率的要求,阐明了紧邻建筑物SMW工法桩跳仓施工的可行性与优越性。根据计算分析结合工法桩实际施工要求,确定采用跳仓1幅距离施工的方案。在保证安全的前提下,减少了对周边地层的扰动影响,提高了施工效率。The SMW columns are widely applied in strengthening the urban soft soils because of its advantages of fast installation and good groundwater seepage blocking performance.This paper presents a deep excavation project case history in the saturated soft soils with adjacent old building in Liuyanjing station of Nanchang Metro Line 3.The sequential installation of the conventional SMW columns is easily to induce the disturbance of adjacent building stratum in the early stage of cementsoil hardening.Therefore,the safety of the surrounding buildings cannot be warranted.Two analytical conditions of SMW column sequential and skip installations are established based on the numerical method,and the mechanical responses of the surrounding strata caused by the SMW column installation under different working conditions are compared and analyzed.By setting up the numerical model of different installation length and skip distance,combining the requirement of the installation condition and the efficiency,this paper presents the feasibility and advantage of column skip installation by SMW method in adjacent buildings.According to the analysis combined with the actual installation requirements of the construction method,the construction method of skip one distance is determined.On the conditions of ensuring safety,the disturbance to the surrounding strata is minimized and the installation efficiency is improved.

关 键 词：SMW工法桩 紧邻建筑物 跳仓 数值分析 

分 类 号：TU473[建筑科学—结构工程]