Study On Strengthening Countermeasures Of Double Highway Tunnel Undercrossing High And Steep Slope

Although the domestic and foreign scholars have done a lot of research on slope engineering, but as a result of the western mountains geological landform form is complicated, the choice of high and steep slope reinforcement technique and reinforcement methods are more and more difficult to choice, especially the problems after double hole tunnel through the potential landslide slope still difficult. Paper with KaYang hydropower station traffic engineering construction as the background, which had double hole lateral through the high and steep slope and had serious landslides during accident, comprehensive use of theoretical analysis, numerical simulation and optimization method to study reinforcement measures of double hole tunnel through the high and steep slope, the main work includes the following several aspects:1. Using the method of field investigation and literature review, combine with KaYang traffic engineering practical conditions of the mountain slope, especially the major effect of Caopingzi tunnel slope of double tunnel hole through it, comprehensive and systematic analyze double hole section of the tunnel crossing the high and steep slope engineering conditions, found under the complicated geological conditions, especially the double hole tunnel project to wear on the slope stability is very bad, so we must reinforce the slope to ensure the safety of the project.2. Using theoretical analysis and numerical simulation to analyze tunnel construction impact on slope stability, compare the difference between before and after the highway tunnel work slope stability coefficient, found after tunnel work, the stability of the slope coefficient has dropped below safe value, so we must reinforce the slope.3. Using theoretical analysis and numerical simulation, analyze reinforcement methods of anti-slide pile, slope and the combination of anti-slide pile and slope, using three kinds of typical working conditions to analysis each method, we can draw: The location of anti-slide pile and embedment depth has larger influence on the stability of the slope; the spacing and cross-sectional area of the cable has more obvious influence on the stability of the slope; when using combination of anti-slide pile and slope to reinforce the slope, the anti-slide pile has larger influence on the stability of the slope, the main influence factor is still the layout position and embedment depth.4. To the specialty of KaYang slope, considering the applicability, economy and construction difficulty, respectively analyze three kinds of reinforcement scheme and concluded that the anchor cable joint reinforcement is the most reasonable.