DMPC工法沉井下沉施工对土体及环境影响研究  

Study on Influence of DMPC Method Caisson Sinking Construction on Soil and Environment

作　　者：于顺利 YU Shunli(Shanghai Foundation Engineering Group Co.,Ltd.,Shanghai 200433,China)

机构地区：[1]上海市基础工程集团有限公司,上海200433

出　　处：《建筑施工》2024年第11期1833-1838,共6页Building Construction

基　　金：上海建工集团重点研发项目(23JCSF-25)。

摘　　要：压入式沉井可在施工过程中调整下沉系数,并及时纠偏,减少对土体的扰动,大大降低对周边环境的影响,适用于建筑物密集的市区或周边环境复杂的地区。因此,合流污水一期复线工程(总管部分)FXZ1.1标工程使用数字化微扰动压入式沉井(DMPC工法)施工。结合1#盾构井实测数据,着重介绍了DMPC工法沉井下沉施工过程中,土体变形及周边环境影响情况。数据分析表明:DMPC工法沉井下沉过程中挤土效应与开挖效应并存;土体水平位移、土体分层沉降、地表沉降、建(构)筑物沉降、管线沉降、抗拔桩水平位移等均随沉井下沉深度的增加而增大,并随着距离沉井井壁距离增大而减小;可将距井壁5.0~15.0 m范围内的地表沉降,距井壁3.0~5.0 m范围内的管线、建(构)筑物沉降影响控制在毫米级水准。充分说明DMPC工法沉井下沉过程对环境影响微小,适用于复杂敏感的施工环境。The press-in caisson technique allows for adjustment of the sinking coefficient during construction,enabling timely correction of deviations and reducing soil disturbance,significantly minimizing the impact on the surrounding environment.It is particularly suitable for urban areas with dense buildings or regions with complex surroundings.The first phase of the combined sewage double-line project(main pipe section)FXZ1.1 adopts the digital micro-disturbance press-in caisson(DMPC method).Based on the measured data from the No.1 shield well,the focus is placed on soil deformation and environmental impact during the DMPC caisson sinking process.Data analysis reveals that both the squeezing effect and excavation effect occur simultaneously during the sinking.Horizontal soil displacement,layered soil settlement,surface settlement,and settlement of buildings,pipelines,and uplift piles all increase with the sinking depth of the caisson,while they decrease with increasing distance from the caisson wall.Surface settlement within 5.0 to 15.0 meters from the caisson wall,as well as pipeline and building settlements within 3.0 to 5.0 meters,can be controlled at the millimeter level.These findings demonstrate that the DMPC sinking process has minimal environmental impact,making it suitable for complex and sensitive construction environments.

关 键 词：压入式沉井 DMPC工法 沉井下沉施工 土体变形 环境影响 

分 类 号：TU753[建筑科学—建筑技术科学]