推覆构造带碳酸盐岩隧道突水机制及风险规避

发布时间：2018-07-10 04:41

本文选题：隧道工程 + 武当推覆体　；参考：《岩石力学与工程学报》2014年S1期

【摘要】：以大坪山隧道已开挖段突水点的共性及异性特点为切入点,对武当推覆构造带隧址区的特殊地质构造环境、岩性差异变化及水文地质环境进行剖析。从推覆构造对突水的影响、对蓄水构造控制作用以及水文单元差异3个方面阐述其突水机制。在此基础上,建立包括地层岩组差异、褶皱构造、断裂构造、地形地貌以及水文地质环境等5种地质孕灾因子的风险评价模型。利用模糊优选方法选出最易孕育岩溶突水灾害的地质环境组合,即"寒武系灰岩+向斜核部+张性裂隙+丘陵地貌+充足地表水"。根据权重值进行突水危险性等级划分,提出以地质环境风险评价成果为核心,综合物探方法互为验证的"体面线点"式的岩溶突水风险规避方法,并与掌子面揭露情况进行对比以验证其准确性。验证结果表明:重视地质分析法为核心的综合物探方法是复杂地质构造区域岩溶风险规避中的主要地质预报方向。
[Abstract]:Based on the common and different characteristics of water inrush points in the excavated section of Dapingshan Tunnel, this paper analyzes the special geological tectonic environment, lithologic variation and hydrogeological environment in the tunnel area of Wudang nappe structural belt. The mechanism of water inrush is expounded from three aspects: the influence of nappe structure on water inrush, the controlling effect of water storage structure and the difference of hydrological unit. On this basis, a risk assessment model of five geological hazard factors including stratigraphic rock group difference, fold structure, fault structure, topography and geomorphology and hydrogeological environment is established. The fuzzy optimal selection method is used to select the geological environment assemblage which is most susceptible to the karst water inrush disaster, that is, "sufficient surface water in the tensional fissure hills and landforms of the Cambrian limestone syncline core". According to the classification of water inrush risk grade according to the weight value, this paper puts forward a method of avoiding karst water inrush risk, which is based on the results of geological environment risk assessment and verified by comprehensive geophysical exploration method. And with the face of the disclosure of the situation compared to verify its accuracy. The verification results show that the comprehensive geophysical exploration method with emphasis on geological analysis method is the main direction of geological prediction in karst risk avoidance in complex geological structure regions.
【作者单位】：中国地质大学工程学院;福建省地质灾害防治重点实验室;湖北省谷竹高速公路建设指挥部;
【基金】：国家自然科学基金资助项目(41202201,51108434) 湖北省谷城至竹溪高速公路科技项目大断裂区超深埋特长隧道关键技术研究与应用(2011056080)
【分类号】：U457.5

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