矩形巷道围岩应力分布规律模拟试验研究

Simulation Test Study on Stress Distribution of Surrounding Rock in Rectangular Roadway

矩形巷道围岩应力分布规律较为复杂,且与地应力、地质构造、围岩岩性等因素有关。在理论分析的基础上,采用相似模拟试验的研究方法,通过对不同围岩强度等级的矩形巷道围岩应力分布规律开展研究,进一步揭示矩形巷道开挖后围岩的次生应力场分布规律。研究结果表明:矩形巷道开挖后帮部重分布的次生应力场会形成较高的集中应力,应力集中系数平均达到3.0;矩形巷道围岩的应力转移及分布是一个复杂的动态变化过程,其变化与围岩的强度有很大关系。

The stress distribution law of the surrounding rock is more complex, and it is related to the stress, geological structure, lithology and other factors. On the basis of theoretical analysis, using the research methods of simulation experiment,researching the distribution law of rectangular roadway surrounding rock stress under different strength, further revealing the distribution of secondary stress of surrounding rock rectangular roadway excavated. The results show that： after the excavation of rectangular tunnel, the secondary stress field redistribution will form high concentrated stress, and the stress concentration coefficient will reach 3.0;the stress transfer and distribution of the surrounding rock in rectangular roadway is a complex dynamic change process, and its variation is closely related to the strength of surrounding rock.