| 基于安全系数法地铁暗挖通道施工可靠性分析 |
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| 引用本文： | 吴波、吴兵兵.基于安全系数法地铁暗挖通道施工可靠性分析[J].福建工程学院学报,2021,0(4):322-329. |
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| 作者姓名： | 吴波、吴兵兵 |
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| 作者单位： | 东华理工大学 |
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| 摘 要： | 地铁车站出入口通道暗挖施工具有很高的风险，为确保此类工程安全施工及量化评价施工可靠性，以南昌地铁3号线通道暗挖工程为依托，采用ABAQUS软件建立三维数值分析模型分别模拟上下台阶法施工和交叉中隔壁法施工。数值模拟结果表明，仅交叉中隔壁法能够满足安全施工和有效控制地层沉降的要求。针对交叉中隔壁法施工，采用有限元强度折减法计算得到无风险因素作用和风险因素最不利组合作用下的安全系数，由点估计法计算通道暗挖施工可靠度。研究结果表明:无风险因素作用时，通道暗挖施工失效概率仅为0.17%，当通道左上导洞开挖遭遇极端降雨天气时，失效概率达到99.7%。强降雨导致通道上覆土体强度降低，此时必须采取加固措施，否则通道施工安全和沉降控制将大概率无法满足要求。通道暗挖施工期间应高度重视监控量测工作，风险因素作用下通道围岩有显著的特征点位移变化，是一个渐进的过程，及时分析监测数据和采取相应技术手段，可避免施工安全风险的发生。
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| 关 键 词： | 地铁 隧道 强度折减法 施工可靠度 监测数据 |
Construction reliability analysis of underground tunnel based on safety factor method |
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| WU Bo,WU Bingbing.Construction reliability analysis of underground tunnel based on safety factor method[J].Journal of Fujian University of Technology,2021,0(4):322-329. |
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| Authors: | WU Bo WU Bingbing |
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| Institution: | School of Civil and Architectural Engineering, East China University of Technology |
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| Abstract: | Underground excavation of entrance and exit passages in subway stations is very risky. In order to ensure the safe construction of such projects and quantitatively evaluate the construction reliability, based on the tunnel excavation project of Nanchang Metro Line 3, ABAQUS software was adopted to establish three-dimensional numerical analysis models to simulate the construction of the up-down step method and the construction of CRD method respectively. Numerical results show that CRD method can meet the requirements of safe construction and effective control of subsidence. The safety factor under the effect of no risk factors and the most unfavorable combination of risk factors was calculated by the finite element strength reduction method, and the reliability of tunnel excavation construction was calculated by the point estimation method. Results show that the failure probability of tunnel excavation without risk factors is only 0.17%, and the failure probability of tunnel excavation under extreme rainfall weather reaches 99.7%. The strength of overlying soil is reduced due to heavy rainfall, so reinforcement measures must be taken at this time, or the safety of construction and settlement control of the passage will most likely fail to meet the requirements. Great importance should be attached to monitoring and measurement work during tunnel excavation construction. Under the action of risk factors, rocks surrounding the tunnel shows significant displacement changes of characteristic points, which is a gradual process. Timely analysis of monitoring data and adopting corresponding technical measures can avoid the occurrence of construction safety risks. |
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| Keywords: | subway tunnel strength reduction method construction reliability monitoring data |
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