|
Is an urgent need to adapt to the sustained, rapid and coordinated development of China's railway modernization implementation of leapfrog development ideas to accelerate the expansion of the size of the road network, improve the structure of the road network, the full implementation of the new concept of railway construction, especially large-scale development of the western region of depth, tunnel CROSSLINE often become the best choice for mountain railway, increasingly large share of the line of the railway tunnel. Reconstructed railway Huhanrong channel Xiangfan, Xiangfan to the well-being of additional second-line segment to Hu Jia camp, mostly through the low mountain valley of northwestern Hubei, low Zhongshan valley railway tunnel under construction during the construction period due to the complexity of the geological conditions, no little problem, one of the most prominent geological disasters and tunnel lining deformation and failure. In this paper, Xiangfan-Chongqing, Xiang Hu paragraph, additional second-line railway tunnel, for example, the main problem in the construction of the railway tunnel under complicated geological conditions, geological disasters during the construction of the tunnel, the tunnel lining disease and tunnel monitoring. Main understanding through the study, obtained as follows: (1) hole in front of no cutting, must be as early into the night out without destroying the mountain environment, to minimize the side slope disturbance promote \hole drainage system around. (2) the tunnel entrance, with shallow, weak broken and prone to collapse the Lot complex conditions of the existing tunnel with small clear distance, deformation and failure must improve the difficult lot of security risks and construction difficulty understanding, attention to hole ago, before the construction of complete construction program for the preparatory work (site layout, pre-reinforcement measures, construction methods, etc.), program audited approval after construction, not free to change the course of the program. (3) The construction of the tunnel with shallow, weak broken lots, the primary emphasis on the control of the surrounding rock deformation rather than the surrounding rock deformation release specific approach is: (1) initial support is stronger, the timely applied for stiffness initial support to effectively control the surrounding rock deformation and surface subsidence; ② The secondary lining to be applied for in a timely manner, without having to adhere to the surrounding rock deformation rate must be less than 0.2mm / d before provisions. (4) must be solid after digging, strict implementation of the 27-character principle \anti-collapse and deformation and failure and control surface subsidence most reliable principle in through a special section with shallow, weak broken. (5) The construction of the tunnel with shallow, weak broken lots must be a short step construction method, try to shorten the step length, the early closure of the invert into a ring, special difficulties lot more steps remain the core indigenous ring excavation construction, can effectively inhibit the sink and the convergence of the tunnel arch deformation. (6) Monitoring and Measurement is the core of the construction must seriously get fast results, to grasp the changes in the characteristics of the cavern, with particular emphasis on stability doubled the Diameter at and up and down stairs position, which often collapse, the most dangerous time of deformation segments. Must pay attention to the spatial and temporal changes in effect, do four in a timely manner, and that timely support, timely measurement and timely feedback and timely correction. (7) must adhere to the dynamic design, dynamic construction and dynamic management; must follow the feedback of information design, information construction and dynamic management of information technology. (8) security risk management at different levels, and higher prices for better quality management to promote the construction of the tunnel project establish reasonable safety risk management at different levels, and higher prices for better quality management system, and to reduce the level of security incidents and the quality of the tunnel project hidden.
|