深部大断面软岩硐室加固技术研究

Research on Reinforcement Technology for Deep Large-Section Soft Rock Chamber

深部大断面软岩硐室具有围岩破碎、断面大、应力大等特点,其支护维护困难。以某矿变电所为研究对象,通过理论分析和数值模拟研究了深部大断面软岩硐室的破坏特征,分析了“喷-锚-注”加固技术的机理,并提出了“三喷+锚固+注浆”的支护方案。监测结果表明,大断面软岩硐室经过“喷-锚-注”支护后,两帮最大移近量为108.9 mm,顶、底板最大移近量为109.5 mm,软岩硐室变形较小。实践表明,“喷-锚-注”加固技术可以有效地维护深部大断面软岩硐室的稳定,对解决相似地质条件下的深部大断面软岩硐室及巷道支护提供了借鉴,为深部大断面软岩硐室及巷道支护稳定性控制难题有重要的实践意义。

Deep large-section soft rock chamber has the characteristics of broken surrounding rock, large section and high stress, so its support and maintenance are difficult. Taking a substation in a mine as the research object, through theoretical analysis and numerical simulation, the failure characteristics of deep large-section soft rock chamber were studied, the mechanism of spraying-anchoring-grouting reinforcement technology was analyzed, and the support scheme combining three times of sprayings+anchoring+grouting was put forward. The observation results show that after the large-section soft rock chamber is supported by spraying-anchoring-grouting, the maximum displacement of the two sides is 108.9 mm, the maximum displacement of the roof and floor is 109.5 mm, and the deformation of the soft rock chamber is small. The practice shows that the spraying-anchoring-grouting reinforcement technology can effectively maintain the stability of deep large-section soft rock chamber, and provide a reference for support this kind of chambers and roadways under similar geological conditions. The study has an important practical significance for the stability control of deep large-section soft rock chamber and roadway support.