白山隧道塌方处治技术及其监测结果分析

发布时间：2019-08-15 15:01

【摘要】：白山左线隧道施工中,针对塌方发展过程和塌方机理,实施了一套基于"地表排水、围岩注浆、衬砌增强、基底防降"的塌方综合治理方案。文章分析了方案实施后的地表沉降、拱顶下沉、拱腰和边墙水平收敛的位移变化规律,以及初期支护背后水压力、初期支护与围岩的接触应力、锚杆轴力、型钢拱架应力及二次衬砌混凝土应力的发展趋势。结果表明:在软弱围岩地段,拱墙二次衬砌的施作显著改善了初期支护与围岩的接触应力,有效地减小了地表沉降及隧洞周边位移;同时,拱墙二次衬砌能有效地分担锚杆和型钢拱架的的部分荷载,改善仰拱二次衬砌的受力状况;塌方综合治理方案效果较好,保障了该隧道剩余塌方段的安全施工。
[Abstract]:In the construction of Baishan left line tunnel, according to the development process and collapse mechanism of collapse, a set of comprehensive treatment scheme based on "surface drainage, grouting of surrounding rock, reinforcement of lining and prevention of foundation fall" is implemented. This paper analyzes the displacement variation of surface settlement, arch roof subsidence, horizontal convergence of arch waist and side wall after the implementation of the scheme, as well as the development trend of water pressure behind initial support, contact stress between initial support and surrounding rock, axial force of anchor rod, stress of steel arch frame and stress of secondary lining concrete. The results show that in the weak surrounding rock section, the secondary lining of the arch wall can significantly improve the contact stress between the initial support and the surrounding rock, effectively reduce the surface settlement and the displacement around the tunnel; at the same time, the secondary lining of the arch wall can effectively share part of the load of the anchor rod and section steel arch frame, improve the stress condition of the secondary lining of the inverted arch, and the comprehensive treatment scheme of the collapse has a good effect, which ensures the safe construction of the remaining collapse section of the tunnel.
【作者单位】：中南大学土木工程学院;韶赣高速公路管理中心;湘潭大学土木工程与力学学院;
【基金】：国家自然科学基金资助项目(50878213) 湖南省研究生创新基金项目(CX2013B078) 广东省公路管理局科技项目(2011-14)
【分类号】：U458.3

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