隧道围岩应力与裂纹扩展关系研究

该文以靖宇至辉南的龙岗隧道为研究载体,利用有限元方法分析隧道围岩的应力分布特征,并应用格里菲斯判据来分析围岩内裂纹扩展规律。研究表明,在硐室的周边拉应力区和应力集中程度高的区域易产生裂纹扩展。该工程中拉应力产生的部位主要在硐底中心附近,应力集中区分布于硐肩和拱角处,所以在硐底、硐肩和拱角处易产生裂纹扩展。

Study of Relation between Country Rock Stress and Crackle Spread in Tunnel

The article takes Longgang Tunnel from Jingyu to Huinan as an example for study, utilizes the finite element method to analyze the stress distribution characteristics of the country rock in tunnel, and applies Gleafeisi criterion to analyze the crackle spread laws within the country rock. The study makes clearly that the crackle spreads are easily produced in the perimeter tension stress area and the area with the high stress central level of the caves. In this project, the positions producing the tension stress are mainly near the center at the cave bed, and the stress central area is distributed at the cave shoulder and the arch corner. So the crackle spread is easily produced at the cave bed, cave shoulder and arch corner.