复杂环境下富水超浅埋高灵敏地层暗挖地铁车站施工沉降控制

Construction Settlement Control of Underground Excavation Subway Station in Super-shallow and Highly Sensitive Strata with Rich Water under Complex Environment

随着地铁车站施工技术的成熟应用,复杂环境、下穿城市主干道等敏感地域施工越来越多。本论文以郑州地铁10号线医学院站车站工程为研究实例,重点论述复杂环境下不良地层施工的沉降控制措施,在洞桩法(PBA)车站顶板为平顶直墙情况下,依据工程实际,专门设计了临时支撑型钢支架,以加快施工进度,确保安全生产;通过建模分析,依据力学结构计算模型(重点是体系转换时理论最大变形量的位置)、预埋应变片、确定变形监测点等措施,以理论指导实际,用实际数据论证理论值的准确性,为车站施工的沉降控制及危险性较大的工序转换提供了有力支撑。实践和试验结果表明,各项措施合理有效,解决了工程中的实际问题,对类似工程提供了设计、施工思路和借鉴。

With the mature application of subway station construction technology,more and more sensitive areas such as complex environment and under-crossing urban trunk roads are being constructed.Taking the station project of Zhengzhou Metro Line 10 Medical College Station as an example,this paper focuses on the settlement control measures for the construction of unfavorable strata in complex environment.Under the condition that the top plate of the station with the hole pile method(PBA)is a flat top straight wall,according to the actual project,the temporary support steel support is specially designed to speed up the construction progress and ensure the safety of production.Through modeling and analysis,according to the mechanical structure calculation model(focusing on the position of the theoretical maximum deformation during the system transformation),embedded strain gauges,determination of deformation monitoring points and other measures,the accuracy of the theoretical value is demonstrated with the actual data,which provides strong support for the settlement control of the station construction and the process transformation with greater risk.The practice and test results show that the measures are reasonable and effective,which solved the practical problems in the project,and provides design and construction ideas and reference for similar projects.