双线盾构下穿京沈客专股道区安全影响分析  

Analysis of the influence of double-line shield underpassing the railway track area of Beijing-Shenyang passenger dedicated line

作　　者：蔡志勇 李瀚源 李兴高[2] Cai Zhiyong;Li Hanyuan;Li Xinggao(Beijing Municipal Co.,Ltd.,Beijing 100089,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京市政建设集团有限责任公司,北京100089 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《山西建筑》2024年第22期132-135,共4页Shanxi Architecture

基　　金：国家自然科学基金面上项目(No.52278386)。

摘　　要：以北京地铁3号线区间隧道下穿京沈客专铁路股道区为背景,基于数值模拟方法研究盾构下穿施工对既有铁路线路的影响,并结合现场实测数据验证数值模拟分析的合理性。研究结果表明:板桩加固体系对国铁线路路基变形的保护作用较为明显,当不设置板桩加固结构时,盾构左右线穿越施工后股道17号路基最大沉降量分别为5.8 mm和7.2 mm,不满足铁路路基沉降变形控制指标;当设置板桩加固结构后,路基最大沉降量减小至1.9 mm和2.6 mm,且管片横向收敛变形及既有排水箱涵沉降均显著降低。结合现场施工的实测数据可知,设置板桩体系可以保证盾构下穿施工时既有铁路线路的运营安全。Based on the numerical simulation method,the influence of shield tunneling on the existing railway line is studied by taking the interval tunnel of Beijing Metro Line 3 underpassing the track area of Beijing-Shenyang passenger dedicated railway as the background,and the rationality of the numerical simulation is verified by the field measured data.The results show that the sheet pile structure has obvious protective effect on the deformation of the subgrade of the railway line.When the sheet pile structure is not considered,the maximum settlement of the#17 subgrade after the underpass construction of the double lines of the shield is 5.8 mm and 7.2 mm respectively,which does not meet the control value of the settlement deformation of the subgrade.When the sheet pile reinforcement structure is set up,the maximum settlement of the subgrade is reduced to 1.9 mm and 2.6 mm respectively,and the convergence deformation of the segment and the settlement of the existing drainage box culvert are significantly reduced.Combined with the measured data of on-site construction,it can be seen that the setting of sheet pile structure can ensure the operation safety of existing railway lines during shield tunneling.

关 键 词：盾构隧道 数值模拟 沉降变形 现场实测 

分 类 号：TU997[建筑科学—市政工程]