【作者】 张晓丽； 张顶立； 王梦恕；

【Author】 Zhang Xiaoli, Zhang Dingli, Wang Mengshu(Research Institute of Tunneling & Underground Works, Beijing Jiaotong University, Beijing 100044)

【机构】 北京交通大学隧道及地下工程试验研究中心；

【摘要】 随着城市现代化进程的加快,对交通设施建设的需求在不断增加。由于城市所处的特殊环境,地铁在城市交通中占很重要位置,且发展迅速。地铁网的完善和扩能改造等,都带来了大量新线近接既有线施工的工程现象。由于隧道工程对开挖较敏感,且在城市地下工程的近接施工中,既有线与新线位置较近,如果不采取可意的措施,新建线的施工将会影响既有线的安全运营。北京地铁4号线宣武门暗挖车站与既有环线宣武门站成“十”字交叉,宣武门车站单层段顶板距既有车站底板净距为1.9 m。在如此小距离下,如何保证既有线的安全运营,对新建站的施工提出了非常严格的要求。本文对该工程的施工过程进行了三维动态仿真分析,从理论上探讨了所拟定施工方案的合理惟和可行性,并取得了一些有意义的结果,为该工程的顺利施工提供依据和指导。另外,提出依据预测分析结果,结合相应的监控量测,将新建4号线宣武门站施工对地表沉降和既有线变形的影响控制在允许范围内,实现对北京地铁4号线宣武门站施工的安全管理。本文的研究可供同类穿越工程问题参考。更多还原

【Abstract】 With the development of city modernization speeding up, the need about the construction of means of transportation is increasing. Because of the special settings of cities, the metro occupies the important situation and it develops very quickly. The consummating and making over of the metro network bring up the fact of constructing new lines close to existing lines. Because of the sensitivity of tunnel engineering to excavation and very near position between new lines and the existing lines of underground engineering in cities, the construction of new lines will affect the safety service of the existing lines, if the reliable measures not adopted. Xuanwumen metro station in number 4 line of Beijing subway crosses with Xuanwumen metro station in existing loop line. In monolayer segment, the clean distance of two metro stations is 1.9m. The distance is so small, that ensuring the safety service of the existing line must control strictly the construction of the new line. The three dimension dynamic analysis of the construction process is presented in the paper and the rationality and feasibility of the construction project studied out is discussed in theory. Some significative results are obtained and may offer bases and direction to constructing the project all right. In addition, if combing with the result forecasted and the corresponding inspecting and measuring, the effect of the construction of the new line to ground settlement and the distortion of the existing line being controlled in permuted bound is also discussed in the paper. The study in the paper may be referenced by the similar project.更多还原