地连墙成槽施工对周边环境的影响及控制

Influence and control of diaphragm wall trench construction on surrounding environments

以苏州地铁5号线某车站地下连续墙施工为研究背景,采取了增加导墙刚度、选择合适成槽机械、合理划分槽段、间隔施工地连墙槽段及控制泥浆参数等控制措施,并对槽长、土体摩擦角、泥浆液面高差等影响地连墙槽壁稳定性的因素进行了分析.采用现场监测的方式对土体水平位移、地表沉降、建筑沉降与建筑倾斜进行监测,研究地连墙施工过程中的地层稳定和变形规律,结合研究结果对工程中的地层变形控制措施进行评价.研究结果表明:浅层土体受到扰动较大,土体变形明显,最大土体水平位移发生在地表;深层土体受到扰动较小,土体变形随着深度的增加而减少;现场采取的地层控制措施所产生的土体变形均在控制范围内.

Taking the diaphragm wall construction of a station in Suzhou metro line 5 as research background,the measures of enhancing guide wall stiffness,selecting suitable machinery,dividing relatively small trench panel,trenching stagger and controlling slurry parameters were adopted.The effects of the length of trench,the friction angle of soil and the height difference of mud liquid level on the trench stability were analyzed.On-site monitoring was used to detect the horizontal displacement of soil,surface settlement,building settlement and building tilt.The ground stability and the deformation law during the diaphragm wall construction were investigated and evaluated.The results show that the construction disturbs the ground at shallow depth pronouncedly,which causes the significant lateral ground movement with the maximum lateral ground movement at the ground surface.The deep soil is less disturbed,and the movement is decreased with the increasing of depth.The ground movement is under the controllable range due to the adopted measures.