断裂滑移型岩爆风险评价和预警方法研究现状

State of the art review of the risk assessment and early warning methods for fault-slip rockburst

  • 摘要: 地下工程需要频繁穿越地质构造区域,断裂滑移型岩爆频发,严重威胁地下工程结构的稳定和安全。为了揭示断裂滑移型岩爆诱发致灾机理,本文系统分析了触发断裂滑移型岩爆的地质构造条件、时空孕育特征、扰动触发机理、风险评价指标和预警方法等。研究结果表明:断裂滑移型岩爆多发生于含软弱结构面或层理面的地质构造带附近,岩体硬性结构面可以在一定程度内控制岩爆爆坑边界;断裂滑移型岩爆在临界失稳触发阶段存在典型的时空前兆特征,声发射(微震)监测参数在临界滑移失稳阶段存在“相对平静期”破坏前兆,红外热像温度存在短暂异常后随即迅速消失的破坏前兆;岩体内部天然层理面等缺陷结构为触发断裂滑移型岩爆提供了地质构造条件,巷道开挖和掘进等为触发断裂滑移型岩爆提供了滑移失稳空间,外界动力扰动等为触发断裂滑移型岩爆提供了诱发条件。

     

    Abstract: Underground engineering generally needs to pass through a significant number of geological structure areas, which can easily induce fault-slip rockburst, threatening the engineering structure's stability.For revealing the mechanism of disaster causing of fault-slip rockburst, the geological structural conditions, spatiotemporal inoculation characteristics, disturbance triggering mechanism, risk assessment indicators and the early warning methods of fault-slip rockburst was systematically analyzed in this study.The results show that fault-slip rockburst mostly occurs in the geological structure area which containing the weak structural plane or bedding plane, and the hard structural surface controls the rockburst crater boundary.The fault-slip rockburst has typical spatiotemporal precursor characteristics.As a matter of fact, the acoustic emission (microseismic) monitoring parameters have a typical precursor of a "relatively quiet period" in the critical failure stage, and the infrared thermal image temperature will appear the phenomenon of short-term abnormality.The natural defect structure provides geological structure conditions for the occurrence of fault-slip rockburst, roadway tunneling provides a slip space for fault-slip rockburst, and the dynamic stress provides disturbance triggering conditions for triggering fault-slip rockburst.

     

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