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基坑工程存在的不确定因素较多,科学有效的监控措施是保证安全施工的关键。根据钱江隧道试验段深基坑工程所处的水文地质条件和周边环境特点,从地面沉降、地连墙测斜、支撑轴力、地下水位变化等4个方面对深基坑开挖的施工控制技术进行了研究。以实测数据为基础,分析提出了钱塘江围垦区域地面最大沉降和地连墙最大侧向变形两个指标的建议控制值。实际工程表明,该施工监测和控制方案效果较好,可为其他类似工程提供参考。
There are many uncertain factors in foundation pit engineering. Scientific and effective monitoring measures are the key to ensure safety construction. According to the hydrogeological conditions and surrounding environment characteristics of the deep foundation pit project in Qianjiang tunnel test section, the construction of deep foundation pit excavation from four aspects of ground subsidence, ground and wall inclination measurement, axial force support, groundwater level change and so on Control technology was studied. Based on the measured data, the proposed control value of the two indicators of the maximum settlement on the ground and the maximum lateral deformation of the wall in Qiantang River reclamation area is analyzed. The actual project shows that the construction monitoring and control scheme works well and can provide reference for other similar projects.