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以某深基坑为例,详细介绍了该项目基坑周边地面的沉降变形情况,实际监测数据表明,自基坑开挖起,基坑周边地面呈现微量隆起的变形特征。因基坑开挖会引起坑底土卸荷后产生回弹现象,随着支护桩及基坑周边区域的沉降,还会引起周边建筑物、地下管线及临近道路的沉降,量值过大时应高度重视,采用必要的工程措施控制相应的变形。本文通过施工进程、气温等因素,结合锚索内力、桩顶水平位移及桩体深层水平位移数据,综合分析引起基坑周边地面隆起的内在因素,提出在设计、施工各个阶段均需要合理制定设计、施工方案,以达到隆起量优化控制的作用。
Taking a deep foundation pit as an example, the settlement and deformation of the ground near the foundation pit of the project are described in detail. Actual monitoring data show that since the excavation of the foundation pit, the deformation of the ground around the foundation pit shows slight deformation. Due to excavation of foundation pit, rebound will occur after unloading of pit bottom soil. With the settlement of supporting pile and surrounding area of foundation pit, settlement of surrounding buildings, underground pipelines and adjacent roads will also be caused. When the value is too large Should attach great importance to the use of the necessary engineering measures to control the corresponding deformation. Based on the factors of construction process and temperature, combined with the internal force of anchor cable, the horizontal displacement of pile top and the horizontal displacement data of deep pile body, the internal factors causing the rise of ground surface around the foundation pit are analyzed synthetically. The design, construction stages, , Construction plan, in order to achieve the role of uplift volume optimization control.