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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 of surrounding rock in rectangular roadway is complicated and related to the factors of geostress, geological structure and surrounding rock lithology. Based on the theoretical analysis, the researches on the stress distribution of surrounding rock mass in rectangular roadway with different strength classes of surrounding rock are carried out by using the research methods of similar simulation tests. The distribution of secondary stress field of surrounding rock after rectangular roadway excavation is further revealed. The results show that the secondary stress field of the redistribution part of the gangway will form a high concentration stress and the stress concentration coefficient will reach 3.0 on average. The stress transfer and distribution of the surrounding rock in the rectangular laneway is a complex dynamic process, The change has a great relationship with the strength of the surrounding rock.