| In the mountain area,the excavation and protection of cutting slopes are the key to highway engineering.In view of the short cycle in highway construction,it is difficult to accurately describe characteristics of slope geological structure before excavation.Besides the theory of rock mechanics contains many uncertain factors,stability analysis and protection schemes of slope are not scientific and reasonable enough,all these determines the process of slope construction dynamically and risky.Therefore,it is necessary to co-ordinate the phased implementation,extend geological survey to the whole construction process,and analyze stability of slopes dynamically.Then dynamic design and information construction can be implemented in slope engineering.The background of the dissertation was based on some research efforts on some typical slope engineering cases,such as K95 rock slope in HangJin-qu Highway,treatment case of K141 bedding slope in Lishui Provincial Road 50,ZK1 slope reinforced by anchors in Zhu-Yong Highway.By means of a series of research methods,like site geologic survey,field monitoring and numerical analysis,the dissertation studied some aspects in the area of slope engineering as follows:(1)Based on former research achievements and literature survey results,the major influence factors of slope stability were analyzed,and the difficulties and characteristics of slope protection in mountain area were summarized.(2)Based on principle of geological unit division and geological models of typical highway slopes,the technology of dynamic stability analysis and advanced support in the process of highway slope construction was put forward.(3)Study on the application of advanced supporting measures.Based on the finite element software,three geological types of slope numerical models were built,then the reasonable form of commonly used advanced supporting measures was studied.It mainly discussed the optimum form of slope reinforcement with micro piles,the relationship between length,vertical spacing,inclination angle of anchor and safety factor of slope,and so on.(4)On the basis of ZK1 slope in Zhu-Yong Highway,the technology of dynamic stability analysis and advanced support in the process of highway slope construction was applied to engineering practice,and achieved good results. |
