基于双指标深部高应力岩体完整性的评价研究

地下岩体结构工程稳定性是地下工程的研究热点,而其中岩体完整性对地下岩体结构变形、失稳起着决定性作用,同时也是为地下工程的开挖设计、制定支护策略提供理论依据。针对会泽铅锌矿深部高应力、多地层交错等复杂地质环境,采用钻孔RQD统计法与现场声波测试技术,综合对会泽铅锌矿1274m水平岩体进行完整性评价。研究结果表明：统计的RQD均值在25.1%~29.8%之间,结合非连续面条数统计,表现岩体完整性整体上较差;声波测试显示岩体完整性系数范围在0.29~0.53之间,属于破碎及较破碎岩体。两种评价方法的实际应用,可互相评价结果的准确程度,对钻孔所揭露的岩体完整性进行定量分析,为矿山设计提供依据,可为类似矿山提供借鉴。

Evaluation Research on the Integrity of Deep High-Stress Rock Mass Based on Double Index

The stability of underground rock mass structure engineering is a research hotspot of underground engineering, and the rock mass integrity plays a decisive role in the structural deformation and instability of underground rock mass, and also provides a theoretical basis for the excavation design and support strategy of underground engineering. IN view of the complex geological environment such as high stress and multi-stratum interlock in the deep part of huize lead-zinc mine, the integrity of the 1274m horizontal rock mass of huize lead-zinc mine was comprehensively evaluated by using borehole RQD statistical method and field acoustic testing technology. The results show that the mean value of RQD is between 25.1% and 29.8%. Combined with the statistics of the number of discontinuous noodles, the rock integrity is poor on the whole. The acoustic test shows that the rock mass integrity coefficient ranges from 0.29 to 0.53, belonging to fractured and relatively fractured rock mass. The practical application of the two evaluation methods can evaluate the accuracy of each other"s results and quantitatively analyze the integrity of rock mass exposed by boreholes, which can provide a basis for mine design and a reference for similar mines.