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运用三维有限差分法(FLAC-3D)对某特大桥的隧道锚碇区岩体的稳定性进行了数值模拟,分析了原始山体、施工开挖后以及在主缆荷载、塔基荷载作用下岩体的变形、应力状态以及拉应力、塑性区分布,计算了各种工况下岩体的稳定性。根据计算分析结果,对隧道锚碇区岩体稳定性进行综合评价。目前在建的大型特大型悬索桥隧道锚碇不多,加之此软硬岩互层区建隧道锚的工程实例非常少见,因此进行该隧道锚碇区岩体的稳定性分析,具有一定的工程实用价值和推广借鉴价值。
Three-dimensional finite difference method (FLAC-3D) was used to simulate the stability of rock mass in the tunnel anchorage area of a special bridge. The original mountain mass was analyzed. After the excavation and under the influence of the main cable load and the tower foundation load, Body deformation, stress state and tensile stress, plastic zone distribution, rock mass stability under various operating conditions. According to the results of calculation and analysis, the rock mass stability in tunnel anchorage zone is comprehensively evaluated. At present, there are not many large super large suspension bridge tunnels anchored. In addition, there are very few examples of tunnels anchored by soft and hard rock interbeds. Therefore, the stability analysis of rock mass in the anchorage zone of the tunnel has certain practical engineering Value and promotion of reference value.