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从摩尔-库伦破坏准则出发,分析压力拱成拱条件,探讨水平应力、隧道埋深及围岩岩性等因素对压力拱形状的影响,并用软件模拟分析了压力拱与其埋深、水平应力及围岩岩性之间的关系,理论分析和数值模拟结果显示水平应力,隧道埋深是影响压力拱产生的主要因素,而且水平应力对围岩中压力拱的位置和形状有很大影响;围岩强度越高,拱体越靠近硐室,形状越陡峭;围岩强度较低者,拱体则远离硐室,形状越平缓;围岩岩性是影响压力拱形状的主要因素。通过研究可以搞清楚作用在支护结构上的荷载大小及荷载分布情况,得出更加合理的支护结构,从而更好的指导工程实践。
Based on the Mohr-Coulomb failure criterion, the arch conditions of pressure arch were analyzed. The effects of horizontal stress, tunnel depth and surrounding rock lithology on the arch shape were discussed. The effects of pressure arch, buried depth, horizontal stress, The relationship between the lithology of surrounding rock, theoretical analysis and numerical simulation results show that horizontal stress and tunnel depth are the main factors affecting the pressure arch, and the horizontal stress has a great impact on the position and shape of the pressure arch in the surrounding rock. The higher the rock strength, the closer the arch to the chamber, the steeper the shape; the lower the strength of the surrounding rock, the arch is far away from the chamber, the shape of the more gentle; rock lithology is the main factor affecting the pressure arch shape. Through the study, we can find out the load distribution and the load acting on the support structure, and draw a more reasonable support structure to better guide the engineering practice.