Partridge Mountain Tunnel West Approach Slope Safety Evaluation Studies

In the case of complex geological condition, the long-term safety of the slope in mountain area has a direct relation with not only the safe operation of the road itself but also the life and wealth security of the dewellers who live along it. On the basis of gathering data from previous study and researching the stabilization and reinforcing technique of the typical high slope in west approach road, through in-situ tracking investigation and monitoring to the west road, and by way of studying the interaction between slope body and anchoring structure, monitoring data, the result of grey prediction and fuzzy comprehensive assessment, and adopting the idea of integrating prototype investigation and indoor experiment analysis, mechanism analysis and simulation research method, safety factor analysis and interacting relationship study, in-situ monitoring and safety evaluation, and using the theories of engineering geology, geotechnique, rock body mechanic, finite element method and fuzzy mathematics, this paper studies the long-term safety of the typical high slope specially. The main conclusions are listed as follow:1. On the basis of field investigation, we can find out the engineering geological condition of this typical high slope, ascertain the deformation and failure mechanism and the main factors that affect the stability of it. Limit equilibrium theory is used in the qualitative evaluation and quantitative calculation of the stabilization as well as in the optimizing reinforcement design of the high slope.2. Numerical simulation method is used in the analysis of the stabilization of the high slope before it is processed. At the same time, the reinforcement of it is simulated in order to analyze the interaction between slope body and engineering structures. The result shows that the stress in the canchor rod is far below its design value. so the surplus safety factor is still high.3. Through monitoring the stress in anchor rod and the displacement in the surface and below the surface as well as analyzing the data, the safety of the slope is evaluated when the project is over. The result shows that the crown accumulating displacement is mostly in the range of 50mm and the increment is becoming smaller and smaller. The maximam force in the anchor rod is 31KN, far below the design value 70KN. Conclusion is that in a long time the slope will be safe.4. Surface and deep displacement are predicted with grey prediction method. The surface and deep displacement is modeled with the monitoring data in hand. This...