基于FLAC^(3D)的隧道洞口滑坡防治技术优化研究

Study on Tunnel Portal Landslide Prevention Technology Optimization Based on FLAC^(3D)

结合栗石沟隧道洞口滑坡实际水文、工程地质条件,通过强度折减法对隧道洞口边坡在自然状态、边坡坡脚开挖和削坡卸载等6种工况下的稳定性进行了数值模拟分析和评价,并结合实际工作经验和数值模拟计算结果,提出对该滑坡体采取削坡2m+表面喷浆及锚杆支护相结合的处治方案,同时加强洞口坡面排水、坡面和隧道内的变形监测。为工程安全施工提供依据,也为山区隧道洞口开挖提供借鉴。

Based on the hydrological and engineering geological conditions of Li Shi Gou tunnel slope,through strength reduction method the stability of tunnel entrance slope in the natural state,the slope toe excavation and other four kinds of situations were analyzed by numerical simulation and evaluation.Combining with the actual work experience and numerical simulation results,we recommended to choose the treatment method of taking slope cutting thickness 2.0mand combining surface sprayed concrete and anchor bolt support.At the same time,strengthening the slope drainage of entrance to a cave and the deformation monitoring of slope and tunnel,we provided the important basis for the safety of engineering construction.It has a certain value of tunnel entrance excavation in mountainous area.