广深港客运专线隧道下穿地铁施工安全分析

发布时间：2018-01-30 20:52

本文关键词： 客运专线铁路隧道地铁三维数值模拟强度折减法设计安全分析　出处：《铁道标准设计》2017年10期 　论文类型：期刊论文

【摘要】：针对广深港客运专线某隧道下穿地铁3号线工程,采用数值模拟与现场监测的方法,研究客运专线隧道下穿既有地铁线路施工的安全性。利用三维强度折减法,对三维数值模拟模型进行计算得到整体安全系数。研究结果表明:当采用三台阶法施工时,既有地铁隧道结构竖向位移为5.4 mm,与监测结果较吻合,满足运营要求;整体模型安全系数为3.78,夹岩保持稳定。根据计算与监测结果可知:近接工程安全。最后,提出相应设计对策,应采取管棚作为预支护措施、旋喷桩改良地层、复合式衬砌结构,采用控制爆破开挖减少对地层破坏,支护早封闭勤量测。
[Abstract]:In a tunnel of Guangzhou Shenzhen Hong Kong passenger crossing under the Metro Line 3, by using the method of numerical simulation and field monitoring, tunnel of passenger dedicated line beneath the existing subway line construction safety. The use of three-dimensional strength reduction method, the three-dimensional numerical simulation model of the whole safety coefficients are calculated. The results show that when construction by using the method of three steps, both the vertical displacement of the subway tunnel structure is 5.4 mm, is consistent with the monitoring results, to meet the operational requirements; the safety factor model is 3.78, the rock remained stable. According to the calculation and monitoring results show that the proximity of the safety of the project. Finally, put forward the corresponding countermeasures should be taken to design, as an advance pipe shed protective measures, jet grouting pile and improve strata, composite lining structure, using controlled blasting to reduce formation damage, supporting early closed ground measurements.

【作者单位】：中铁第四勘察设计院集团有限公司;
【分类号】：U455
【正文快照】： 在我国一线城市诸如北京、上海、深圳、广州等城市地下轨道交通网络逐渐加密,新建工程近接既有隧道的案例逐年增多。早在2003年,仇文革[1]通过工程实例及数值模拟计算,分析总结了地下工程近接施工的力学机理并提出了施工对策。随着近接工程在各个城市频繁出现,对于地下工程近

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