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针对地形偏压隧道设计、施工技术难题,为进一步探查偏压结构受力和变形特征,采用数值模拟计算的手段展开研究。计算得出了CD法偏压隧道施工过程围岩应力的变化规律,对比分析了偏压角度对结构受力和变形的影响程度。结果表明,围岩压力释放的规律和最终量值分布主要受开挖顺序的影响;单洞偏压隧道宜先开挖深埋侧;随偏压角度增大,结构受力愈趋于不利,深埋侧表现更为突出。
Aiming at the design and construction technical problems of topographic bias tunnels, in order to further investigate the stress and deformation characteristics of the biased structure, the numerical simulation is used to study. The variation law of the surrounding rock stress in the process of CD bias tunneling is calculated, and the influence degree of the bias angle on the stress and deformation of the structure is comparatively analyzed. The results show that the regularity of the pressure release and the distribution of the final value of the surrounding rock are mainly affected by the excavation sequence. The single-hole biased tunnel should excavate the deep buried side first. As the bias angle increases, the structural stress tends to be unfavorable, Buried side performance is more prominent.