岩脉影响洞室围岩稳定性的机理研究

Mechanism Research on the Stability of Openings Surrounding Rock Affected by Dikes

岩脉作为一种侵入体,是影响地下洞室围岩稳定性的重要因素。以山东某地下洞室为工程背景,结合建设区基本地质条件和施工中遭遇的不良地质现象,定性分析区内岩脉对围岩稳定性的影响;在此基础上,采用FLAC3D软件模拟分析某段岩脉对围岩稳定性影响,与理想工况对比分析得出岩脉影响洞室围岩稳定性的机理。结果表明,岩脉的存在不但造成围岩体的不均匀收敛加剧及力学性质恶化,还扩大了塑性区与松动圈范围,对洞室围岩稳定不利。

As an intrusion, dike is a major factor that influences the stability of openings surrounding rock. Based on the analysis to the basic geological conditions of an opening site in Shandong province, qualitative analysis about the influence that the dikes impose on the stability of surrounding rock has been done, combining with the bad phenomena encountered during the caverns construction process. The condition in which the dike has an influence on the stability of surrounding rock is simulated by the software FLAC3D. Compared with the ideal condition, the mechanism of influence on the stability of surrounding rock is investigated. Results show that dikes not only make non-uniform convergence serious and aggravate mechanical properties, but also expand the plastic zone and loose circle. It has caused unfavorable influence on the stability of surrounding rock.