隧道洞口段边坡开挖稳定性及加固设计

发布时间：2018-06-13 07:25

本文选题：边坡工程 + Hoek-Brown准则　；参考：《辽宁工程技术大学学报(自然科学版)》2014年07期

【摘要】：依托庙岭隧道实际工程,基于Hoek-Brown准则并通过数值模拟重点分析隧道开挖对洞口段边坡的扰动影响,获得了边坡滑移的危险区域及锚固影响范围,对锚固设计方案进行了优化.研究结果表明:隧道开挖之前坡体应力变化场比较均匀,主要是水平向的位移为主,位移主要集中在断层破碎带周围,在边坡上亦有一定范围的潜在滑移面,尤其是在断层破碎带的影响下,可能产生较大地表沉降及沿坡体向下滑移趋势;锚固支护方案较好的减小了边坡的变形量,边坡在隧道开挖过程中存在一定范围的开挖扰动区域与锚固影响区域,开挖扰动区域大约在开挖面周围50 m内,锚固影响范围一般在15~45 m;在高应力范围的基岩中,可以适当调整锚杆作用方向来加固土体、优化设计.
[Abstract]:Based on the Hoek-Brown criterion and numerical simulation, the influence of tunnel excavation on the slope disturbance at the mouth of the tunnel is analyzed, and the dangerous area of slope slip and the influence range of anchoring are obtained, and the anchoring design scheme is optimized based on the actual project of Miaoling tunnel. The results show that the stress field of the slope before excavation is more uniform, the displacement is mainly horizontal displacement, the displacement is mainly around the fault fracture zone, and there is a certain range of potential slip surface on the slope. Especially under the influence of fault fracture zone, there may be a large surface subsidence and downward slip along the slope, and the anchoring scheme can reduce the deformation of the slope. During the excavation of the slope, there is a certain range of excavation disturbance area and anchoring influence area. The excavation disturbance area is about 50 m around the excavating surface, and the anchoring influence area is generally 1545 m. The anchors can be adjusted properly to reinforce the soil and optimize the design.
【作者单位】：辽宁工程技术大学土木与交通学院;
【基金】：国家自然科学基金资助项目(51008148、51274111) 中国煤炭工业协会基金资助项目(MTKJ2012-319) 辽宁省大学生创新创业训练计划基金资助项目(201310147015)
【分类号】：U453.1;U455.7

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