| With the economic construction and west China development in our country, express highway construction plays an important role in leading the development of local economy. In western provinces, express highways have to traverse many mountains and hills, and its geological environment is perplexed which will evoke several geotechnical engineering problems, and bring enormous difficulties to the Express highway construction process. Some new topics in geotechnical engineering are also proposed simultaneously and the stability of the express highway contact blasting is one of the important problems.The thesis took Hunan Ru-chen highway C12Contract, No.2slope comprehensive protection project as the basis, analyzing the stability of the No.2slope by means of heoretical analysis, field engineering geology investigation, numerical simulation and field monitoring method, and putting forward the controlling measures as well. The main achievements of the thesis are as follows:(1) Based on extensive reading about domestic and foreign research materials, the geotechnical slope stability analysis method were elaborated, the factors affecting slope stability were analyzed, and commonly used in slope engineering supporting method and its applicable conditions were discussed, all of which were eventually benefit to the slope stability analysis and provided technical support to the selection of reasonable slope.(2) Apply Geotechnical engineering technology to identify the engineering geological conditions of the slope, and use the limit equilibrium theory to evaluate the stability of the slope. The calculation results showed:the safety factor of the slope without reinforcement treatment is merely0.49, an apparently unstable state.(3) Focused on the characteristics of the slope engineering, the reinforcement treatment, namely recuperative anchor and steel mesh and concrete-shooting reinforcement, was given. And then use the limit equilibrium method to evaluate the slope stability of reinforcement treatment. The calculation results showed that the safety factor of the slope with reinforcement treatment is1.425, and it can meet the requirements of relevant standards.(4) In order to further analyze the feasibility of the reinforcement treatment, the finite element software(MIDAS) is also applied to analyze the stability of the slope with reinforcement treatment. The results of numerical simulation showed after reinforcement of slope, the safety factor is1.425, which can meet the engineering safety and relevant specifications. Thus the side slope reinforcement scheme is viable.(5) Work out the slope reinforcement construction technology measures and on-site monitoring programs. The on-site monitoring of the lope construction showed that if the maximum deformation of the slope after reinforcement was within the allowable range, the slope was corresponding to a steady state. It sufficiently manifested that the slope reinforcement scheme is effective, and it could provide technical reference for similar engineering. |
