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柱状节理玄武岩是火山岩区所特有的地质现象,其地质成因独特,工程特性、开挖响应特征明显不同于一般常见岩体。通过分析地下洞室中柱状节理岩体的开挖响应特征和揭示现象,结合岩石力学理论和数值分析,对柱状节理玄武岩表现出的典型破坏模式及其破坏机制进行深入分析和总结。在此基础上,针对柱状节理玄武岩卸荷易松弛的特点,结合现场监测、检测数据等信息,总结提炼现场实施过程中有效的支护措施、支护时机、开挖方案、爆破控制等支护手段和施工方法,以有效控制围岩松弛变形和松弛向深部扩展,实现复杂条件下的地下洞室围岩稳定控制。
Columnar basalt basalt is a unique geologic phenomenon in volcanic area. Its unique geologic origin, engineering characteristics and response to excavation are obviously different from those of common rock masses. By analyzing the characteristics of excavation response and revealing phenomena of columnar jointed rock mass in underground caverns, the typical failure modes and failure mechanisms of columnar jointed basalt are analyzed and summarized based on rock mechanics theory and numerical analysis. On the basis of this, aiming at the characteristics of easy relaxation of columnar jointed basalt rock unloading, combined with the information of on-site monitoring and testing data, it summarizes the effective support measures, support timing, excavation plan and blasting control support during the process of refinement site Means and construction methods to effectively control the relaxation of surrounding rock deformation and relaxation to the deep expansion of underground rock under complex conditions to achieve stable control of surrounding rock.