深埋硬岩隧洞复杂岩性挤压破碎带塌方过程及机制分析——以锦屏地下实验室为例
发布时间：2019-04-02 06:07
【摘要】：深埋大断面隧洞开挖同时揭露多种不同岩性的岩体,各岩体之间物理力学性质差异大,其破坏规律也不相同。深入研究复杂岩性挤压破碎带的塌方演化过程及机制,对于防塌和治塌具有重要作用。针对锦屏地下实验室二期中3#实验室的复杂岩性挤压破碎带区塌方,通过现场地质调查及矿物分析,发现该处破碎带本身岩性复杂、地应力高是影响这次塌方的关键因素。同时结合现场录像观察的塌落岩体破坏形态、室内电镜扫描结果和不同岩性岩体的空间分布特点,认为此次塌方具有明显的渐进性破坏特征;不同岩性岩体具有不同的破坏机制:南侧边墙和掌子面分布的花斑角砾状大理岩、溶蚀状大理岩为剪切滑移型破坏,北侧边墙方解石化大理岩为节理张开倾倒破坏,顶拱镶嵌组合胶结状大理岩、花斑角砾状大理岩和溶蚀状大理岩为重力型塌落破坏。基于现场录像观察到塌方发生时间的先后顺序和电镜扫描不同岩性岩体的破坏机制,归纳其演化过程为:开挖卸荷→隧洞周边薄层岩体松散垮落→南侧边墙岩体剪切滑移破坏→北侧边墙岩体节理张开倾倒破坏→在两侧边墙卸荷作用下顶拱岩体发生卸荷回弹→重力坍塌破坏。根据岩体破坏机制和塌方演化过程,建议采用围岩表面和内部综合治理的支护措施(初喷不少于10 cm厚的混凝土+带锚垫板的注浆锚杆+挂网+复喷混凝土)。该研究成果可为深埋隧洞穿越复杂岩性挤压破碎带的类似设计、施工、支护提供参考。
[Abstract]:The excavation of deep-buried large-section tunnel at the same time reveals a variety of rock masses of different lithology, the physical and mechanical properties of each rock mass are different, and its failure law is also different. It is very important to study the evolution process and mechanism of collapse in complex lithologic compression and crushing zone, which plays an important role in the prevention and treatment of collapse. In view of the collapse of complex lithologic crushing zone in the second phase of Jinping underground laboratory, the geological investigation and mineral analysis show that the lithology of the crushing zone is complicated, and the high in-situ stress is the key factor affecting the collapse. At the same time, it is considered that the collapse has obvious progressive failure characteristics according to the destruction form of collapsed rock mass observed by on-site video recording, the scanning results of indoor electron microscope and the spatial distribution characteristics of rock masses of different lithology. Different lithologic rock masses have different failure mechanisms: the porphyry breccia marble distributed on the south side wall and the palm surface, the corroded marble is shear slip type, and the north side wall calcined marble is joint opening and dumping failure. The cementitious marble, porphyry breccia marble and dissolved marble are gravity-type collapse failure. Based on the on-site video recording, the sequence of collapse time and the failure mechanism of rock mass with different lithology were observed by electron microscope. The evolution process is summarized as follows: the thin-layer rock mass around the excavation unloading tunnel is loose collapsed; the south side wall rock mass shear-slip failure; the north side wall rock mass joint opening and dumping failure; under the side wall unloading action, the roof arch body occurs under the action of both sides side wall unloading. Unloaded rebound gravity collapses and destroys. According to the failure mechanism of rock mass and the evolution process of collapse, it is suggested to adopt the supporting measures of comprehensive treatment on the surface and interior of the surrounding rock (the grouting bolt with anchor-cushion plate with the thickness of not less than 10 cm is sprayed at the beginning). The research results can be used as reference for similar design, construction and support of deep buried tunnel crossing complex lithologic crushing zone.
【作者单位】： 东北大学深部金属矿山安全开采教育部重点实验室;中国科学院武汉岩土力学研究所;
【基金】：国家自然科学基金国际重大合作项目资助项目(41320104005) 中央高校基本科研专项资金(N150104007)~~
【分类号】：U458.3
本文编号：2452318
[Abstract]:The excavation of deep-buried large-section tunnel at the same time reveals a variety of rock masses of different lithology, the physical and mechanical properties of each rock mass are different, and its failure law is also different. It is very important to study the evolution process and mechanism of collapse in complex lithologic compression and crushing zone, which plays an important role in the prevention and treatment of collapse. In view of the collapse of complex lithologic crushing zone in the second phase of Jinping underground laboratory, the geological investigation and mineral analysis show that the lithology of the crushing zone is complicated, and the high in-situ stress is the key factor affecting the collapse. At the same time, it is considered that the collapse has obvious progressive failure characteristics according to the destruction form of collapsed rock mass observed by on-site video recording, the scanning results of indoor electron microscope and the spatial distribution characteristics of rock masses of different lithology. Different lithologic rock masses have different failure mechanisms: the porphyry breccia marble distributed on the south side wall and the palm surface, the corroded marble is shear slip type, and the north side wall calcined marble is joint opening and dumping failure. The cementitious marble, porphyry breccia marble and dissolved marble are gravity-type collapse failure. Based on the on-site video recording, the sequence of collapse time and the failure mechanism of rock mass with different lithology were observed by electron microscope. The evolution process is summarized as follows: the thin-layer rock mass around the excavation unloading tunnel is loose collapsed; the south side wall rock mass shear-slip failure; the north side wall rock mass joint opening and dumping failure; under the side wall unloading action, the roof arch body occurs under the action of both sides side wall unloading. Unloaded rebound gravity collapses and destroys. According to the failure mechanism of rock mass and the evolution process of collapse, it is suggested to adopt the supporting measures of comprehensive treatment on the surface and interior of the surrounding rock (the grouting bolt with anchor-cushion plate with the thickness of not less than 10 cm is sprayed at the beginning). The research results can be used as reference for similar design, construction and support of deep buried tunnel crossing complex lithologic crushing zone.
【作者单位】： 东北大学深部金属矿山安全开采教育部重点实验室;中国科学院武汉岩土力学研究所;
【基金】：国家自然科学基金国际重大合作项目资助项目(41320104005) 中央高校基本科研专项资金(N150104007)~~
【分类号】：U458.3
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