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基于新建京张铁路八达岭地下车站超大跨的特点,研究其大埋深和大跨度开挖时采用双岩柱法的围岩和支护力学性能。车站埋深达75m~110m,跨度43.87m,高度21.7m,长度495m,断面面积为857.1026m2,如此大的地下车站在国内尚属首例,世界罕见。采用大型非线性有限元软件ABAQUS模拟计算双岩柱法开挖和支护全过程,得出每一开挖步围岩应力,锚杆轴力,衬砌应力,围岩变形的力学参数。计算结果表明,岩柱在开挖过程中发挥了充分的作用,对围岩应力,拱顶沉降起到了非常好的作用,使得地表沉降控制在合理的范围内,说明设计方案比较合理,双岩柱法在较好的围岩中对施工具有快捷和维护围岩稳定的作用。
Based on the characteristics of the ultra-long span at the underground station of Badaling in Beijing-Zhangjiakou Railway, the rock mass and supporting mechanical properties of the large-span cross-section of the underground station at Badaling were studied. The station depth of 75m ~ 110m, span of 43.87m, height 21.7m, length 495m, cross-sectional area of 857.1026m2, such a large underground station is the first case in China, the world is rare. Large-scale nonlinear finite element software ABAQUS was used to simulate the whole process of excavation and support by double rock column method, and the mechanical parameters of surrounding rock stress, anchor axial force, lining stress and surrounding rock deformation were obtained. The calculation results show that the rock columns play a sufficient role in the excavation process and play a very good role in stress and dome settlement of the surrounding rock, making the control of surface subsidence within a reasonable range, indicating that the design scheme is reasonable, Law in the better surrounding rock in the construction of a quick and maintenance of the role of rock stability.