Safety Measures and Early Warning Analysis of Tunnel Crossing Existing Section
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摘要: 新建地铁与既有地铁线路交叉穿越属于高风险工况，当新建隧道近距离穿越既有隧道时，会使既有隧道结构应力状态发生改变，结构产生变形，因此，对穿越既有区间隧道制定有效的安全保障措施十分必要。系统归纳南京地铁在建线路穿越既有运营线路的相关安全保障经验，即当上穿工况时，采取强化外部条件、内部条件和应急响应的保障措施，同时结合数值分析得出MJS门式加固对既有隧道保护作用明显；当下穿工况时，采取增强既有隧道洞内和洞外刚度、配置试验段和运营配合保障措施，同时结合数值分析发现既有隧道洞内环向+纵向加固对既有隧道保护作用显著，且当在距离掘进面20 m范围内，既有隧道沉降、水平位移变化速率最大。最后结合工程实践过程中既有区间预警情况，分析相关原因，为类似工程提供警示和参考。Abstract: The crossing between the new subway and the existing subway line is a high-risk working condition. When the new tunnel crosses the existing tunnel in a short distance, the stress state of the existing tunnel structure will inevitably change and the structure will be deformed. Therefore, it is very necessary to formulate necessary safety measures for the crossing existing section. The relevant safety guarantee experience of the Nanjing Metro Line under construction going up and down through the existing operation line was summarized. In the up-crossing condition, take the guarantee measures to strengthen the external conditions, internal conditions and emergency response. At the same time, combined with the numerical analysis, it is concluded that MJS portal reinforcement has an obvious protective effect on the existing tunnel; in the under-crossing condition, the supporting measures of strengthening the stiffness inside and outside the existing tunnel, configuring the test section and operation cooperation were taken. Combined with the numerical analysis, it is found that the circumferential + longitudinal reinforcement in the existing tunnel has a significant protective effect on the existing tunnel, and the change rate of settlement and horizontal displacement of the existing tunnel is the largest within the range of 20 m from the heading face. Finally, based on the existing interval warning situations in engineering practice, the relevant reasons were analyzed and warnings and references were provided for similar projects.
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[1] 姚海波. 大断面隧道浅埋暗挖法下穿既有地铁构筑物施工技术研究[D]. 北京: 北京交通大学, 2005. [2] 王占生,张顶立. 浅埋暗挖隧道近距下穿既有地铁的关键技术[J]. 岩石力学与工程学报,2007,26(S2):4208-4214. [3] 陶连金,黄凯平,边 金,等. CRD + 顶撑密贴下穿技术的地层适应性[J]. 黑龙江科技大学学报,2015,25(2):182-186. [4] 房 明,刘 镇,周翠英,等. 新建隧道盾构下穿施工对既有隧道影响的三维数值模拟[J]. 铁道科学与工程学报,2011,8(1):67-72. [5] 杨志勇,江玉生,颜治国,等. 盾构下穿地铁运营隧道沉降规律分析[J]. 西安科技大学学报,2014,34(3):268-273. [6] 汪 洋,何 川,曾东洋,等. 盾构隧道正交下穿施工对既有隧道影响的模型试验与数值模拟[J]. 铁道学报,2010,32(2):79-85. [7] 邵 华,张子新. 盾构近距离穿越施工对已运营隧道的扰动影响分析[J]. 岩土力学,2004,25(S2):545-546. [8] 代翼飞,孙 磊,张 伟. 盾构隧道近距离下穿既有隧道的数值分析[J]. 土工基础,2012,26(2):13-15. doi: 10.3969/j.issn.1004-3152.2012.02.005 [9] 白海卫,何海健,李 玲. 正交下穿施工对上部既有隧道安全的影响研究[J]. 地下空间与工程学报,2014,10(2):434-439. [10] 蔡建鹏,刘国宝. 基坑施工对下卧地铁盾构隧道影响的数值分析[J]. 地下空间与工程学报,2013,9(S2):1877-1881. [11] 彭 敏. 深大基坑施工时对下卧运营地铁隧道的专利保护技术[J]. 建筑施工,2010,32(9):924-925. [12] 徐朝辉. 北京地铁10 号线盾构下穿建筑物施工新技术[J]. 隧道建设,2012,32(S2):83-87. [13] 李恒一. 深圳地铁近接盾构区间隧道施工技术研究[J]. 公路隧道,2015,(1):19. [14] 王明年,黄海斌,汤 渊,等. 盾构施工对盾尾浆液压力波动变化的影响[J]. 西南交通大学学报,2019,54(3):461-467, 586. doi: 10.3969/j.issn.0258-2724.20170199 -
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