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偏压隧道病害的发展,与水文地质、设计、施工等条件关系密切,但最主要影响因素是山体长期承受偏压应力作用。偏压应力的持续性作用会导致围岩的渐进性破坏,进而诱发各种隧道病害。因此,确定偏压作用对隧道病害作用机理尤为重要。基于偏压隧道数值模拟计算,结合工程实例,研究隧道开挖前、后围岩偏压应力的重分布作用,并结合工程实测病害统计数据进行分析。结果表明,偏压作用的隧道会引发围岩衬砌的应力集中部位的渐进性蠕变,进而产生裂缝,诱发渗漏水等隧道病害,并随着应力的集中呈现差异性病害的分布规律。
The development of biased tunnel disease is closely related to the conditions of hydrogeology, design and construction, but the most important factor is the long-term bearing of mountain biased stress. The persistence of bias stress will lead to progressive destruction of the surrounding rock, which in turn will induce various tunnel diseases. Therefore, it is particularly important to determine the mechanism of action of bias on the tunnel disease. Based on the numerical simulation of the bias tunnel and the engineering examples, the redistribution of the biasing stress of the surrounding rock before and after tunnel excavation is studied, and the statistical data of the measured diseases are also analyzed. The results show that the tunnel with bias pressure will lead to the gradual creep of the stress concentration area of the surrounding rock lining, which will lead to cracks and induced tunneling diseases such as seepage water. The distribution of different diseases will be presented with the concentration of stress.