复杂地质条件下巷道过断层关键技术研究及应用

发布时间：2018-04-30 18:20

本文选题：复杂地质条件 + 断层破碎带　；参考：《采矿与安全工程学报》2017年02期

【摘要】：断层破碎带具有低强度、易变形、透水性大和抗水性差的特征,巷道开挖常会引起断层活化,极易诱发巷道冒顶或突水事故。基于TSP、震波、瞬变电磁等综合物探超前地质预报技术与工程地质钻探,揭示了巷道掘进前方地层中的断层与含水特性,确立了巷道过断层的合理位置,为过断层巷道掘进施工、超前预加固与围岩支护设计提供了依据。采用地面与工作面预注浆等综合注浆技术,对断层破碎带区域岩体进行注浆堵水加固,形成了双层注浆堵水帷幕,有效地封堵了地下水,提高了巷道过断层区域围岩的完整性与强度,保证了巷道掘进过程中围岩的基本稳定与施工安全,并为后期巷道围岩锚固支护提供了可靠基础。针对断层破碎带岩性复杂、地质灾害突发等特征,基于综合物探预报结果与理论分析,提出了巷道合理掘进与支护技术方案;并针对后期承载和高抗渗性的要求,根据支护结构所承受的水压,采用合理的二次支护结构型式与防渗加固措施,保证巷道围岩与支护结构的长期稳定及安全。
[Abstract]:Fault fracture zone is characterized by low strength, easy deformation, high permeability and poor water resistance. Roadway excavation often causes fault activation and easily induces roof fall or water inrush accidents. Based on comprehensive geophysical prediction techniques such as TSP, seismic wave, transient electromagnetic and engineering geological drilling, this paper reveals the fault and water-bearing characteristics in the strata in front of roadway excavation, establishes the reasonable position of roadway crossing fault, and works for tunneling through fault roadway. Advance pre-reinforcement and surrounding rock support design provide the basis. By using the comprehensive grouting technology such as ground and working face pre-grouting, the rock mass in the area of fault fracture zone is strengthened by grouting and water plugging, which forms a double-layer grouting water plugging curtain, which effectively seals the groundwater. It improves the integrity and strength of surrounding rock in roadway crossing fault area, ensures the stability and construction safety of surrounding rock in roadway excavation process, and provides a reliable foundation for the anchor support of roadway surrounding rock in the later period. In view of the characteristics of complex lithology and sudden geological hazard in the fractured zone of faults, based on the comprehensive geophysical prediction results and theoretical analysis, this paper puts forward a reasonable tunneling and supporting technical scheme for roadways, and aims at the requirements of late loading and high impermeability. According to the water pressure of supporting structure, reasonable secondary support structure type and anti-seepage reinforcement measures are adopted to ensure the long-term stability and safety of roadway surrounding rock and supporting structure.
【作者单位】：中国矿业大学深部岩土力学与地下工程国家重点试验室;马钢(集团)控股有限公司姑山矿业公司白象山铁矿;
【基金】：山东省土木工程防灾减灾重点实验室开放课题项目(CDPM2014KF03) 国家自然科学基金项目(51323004,51322401,51579239,51574223) 中国博士后科学基金项目(2015M580493,2014M551700,2013M531424)
【分类号】：TD263.3;TD353

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