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首页> 外文会议>Proceedings of 2009 international symposium on risk control and managment of design, construction and operation in underground engineering >Study on Variation of Mining-Induced Dynamic Stress at Deep Stope Tunnel
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Study on Variation of Mining-Induced Dynamic Stress at Deep Stope Tunnel

机译：深采场采动动应力变化规律研究

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摘要

When non-pillar sublevel caving method is used to extract the ore around the soft, broken surrounding rockmass at depth, the stability of stope tunnel has become a major technical problem to constrain the safe mining production. Among factors affecting the stability of stope tunnel, the mining-induced dynamic stress is a very important factor. The effects of mining-induced dynamic factors such as the rock retreat mining, rock blasting and variation of rock structures at hanging wall, on the stability of stope tunnel is analyzed, based on the stress and strain monitoring, together with the finite element numerical simulation, the change of mining-induced dynamic stress in the stope tunnel ahs been investigated, and the affected area and peak of the dynamic stress are determined. In addition, some technical measures, including pre-cutting the surrounding rockmass at hanging wall, pre-enforcement and pre-support, control over the single-stage amount of dynamites, and the layout of footwall drift over 10-12m outside the baseline, in order to migrate the negative effect of the mininginduced dynamic stress is put forward.
机译：当采用无桩分段放顶法在深处破碎的软岩周围开采矿石时，采场巷道的稳定性已成为制约安全开采的主要技术问题。在影响采场隧道稳定性的因素中，采矿引起的动应力是非常重要的因素。在应力和应变监测的基础上，结合有限元数值模拟，分析了采矿引起的动静因素，如撤岩，爆破和悬壁岩体结构变化对采场隧道稳定性的影响。 ，研究了采场巷道内采矿引起的动应力的变化，确定了动应力的影响范围和峰值。此外，还采取了一些技术措施，包括在悬墙处预先切开周围的岩体，进行预加固和预支撑，控制炸药的单阶段数量以及在基线之外的10-12m范围内布置底盘漂移，为了迁移，提出了开采动应力的负面影响。

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