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断裂群碳酸盐岩深埋隧道突水机制及风险减避

, PP. 89-95

Keywords: 隧道工程,深埋隧道,地质调绘,岩溶突水,断裂群,风险减避

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Abstract:

结合断裂群区内深埋碳酸盐岩隧道突水点的特征,从多条典型断裂群区构造形成环境、地层岩性、岩溶裂隙水边界条件结合隧道施工情况等因素,重点阐述了断裂群区岩溶突水灾害灾变机制。在此基础上建立断裂群区地层岩性、构造形迹、隧道埋深、水文环境、施工工法等6种致灾因子的风险评价模型。利用模糊层次分析法对断裂群隧道涌水风险、岩溶风险及施工安全风险进行评估,得出后二者风险较高。模糊优选出最适宜断裂群隧道岩溶风险物探方案,即TGP+GPR+炮孔加长法对隧址区隐患点进行了重点预测。与开挖揭露情况进行对比验证其准确性,并提出断裂群区岩溶突水的应急措施。最终形成断裂区隧道岩溶风险等级划分标准,以期对后续穿越断裂群隧道岩溶风险安全施工提供咨询。

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