高应力破碎硐室围岩加固方法及其效果的数值模拟
Numerical Simulation of Reinforcement Method and Its Effect for High Stress Broken Chamber
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摘要: 高应力破碎硐室围岩具有大变形、强流变等特性，合理的加固方法是硐室安全稳定的保证。以长平矿4303变电所硐室加固为研究对象，通过对硐室围岩条件、受力情况和变形破坏机理的分析，提出了反拱封闭支架、组合锚索强力加固和深孔高压注浆转移围岩应力的加固方法。数值模拟研究结果表明：反拱封闭支架与组合锚索能够有防止破裂，深孔注浆能够使围岩高应力向深部转移，组合加固方案能够有效防止围岩破坏和减小围岩变形量。Abstract: High stress broken chamber has the characteristics of strong flowing deformation, large deformation, and reasonable reinforcement approach is the assurance of safety and stability of chamber. Taking Changping 4303 substation’s reinforcement as a study object, through analyzing the surrounding rock, stress condition and deformation and failure mechanism, we propose the reinforcement method to transfer surrounding rock stress, including inverted arch closure supporting and composite anchor cable reinforcing and deep hole high pressure grouting. The research indicates that the combination of inverted arch closure support and composite anchor cable reinforcing can reduce fractures. Deep hole grouting can transfer the high stress of surrounding rock to deep rock. Combination reinforcement can prevernt the damage of surrounding rock and reduce the deformation amount of surrounding rock.
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