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以重庆市在建的笔架山隧道为现场原型,室内采用几何比为1∶25的大比例模型试验,选取不同围岩类别、不同地应力场及不同缺陷形式条件下,进行加载试验至结构产生病害后,采取不同的组合补强措施,再加载至结构破坏,重点对各种不同条件下,补强后结构的最终破坏形式、承载力状况进行研究,得出对于无空洞缺陷或无衬砌减薄的病害隧道,应根据结构是以受拉或是以受压产生的病害来决定内表面的补强形式,然后再结合锚杆补强的组合补强方式;对于有空洞或有衬砌减薄缺陷的隧道结构,补强时首先是进行回填压注,然后再与内衬.拱架+锚杆补强或与内表面补强+锚杆补强两种补强方式合用。而对于无仰拱病害隧道的补强,对两个拱脚应做特别处理,内表面采用内衬.拱架补强时应施作基础,否则采用注浆和打锁脚锚杆的方式加固。
Taking Beijiao Mountain Tunnel under construction in Chongqing as a prototype, a large-scale model test with a geometric ratio of 1:25 was adopted in the laboratory. Loading tests were carried out under different conditions of different surrounding rock types, different ground stress fields and structural defects After the disease, take different combination of reinforcement measures, and then loaded to the structural damage, focusing on various conditions, the final form of damage after reinforcement, the carrying capacity of the situation, come to no void defect or no lining Thin tunnel disease, the structure should be based on the tension or compression of the disease to determine the form of reinforcement of the inner surface, and then combined with the bolt reinforcement combined reinforcement; for the hollow or lined thinning Defective tunnel structure, the first reinforcement is backfill pressure injection, and then with the lining. Arch + bolt reinforcement or reinforcement with the inner surface + bolt reinforcement two kinds of reinforcement combined. For reinforcement without tunnel arch tunnels, the two arches should be specially treated and the inner surface should be lined. The foundation should be used for reinforcement of the arched frame, otherwise, grouting and locking foot bolts are used to reinforce .