| Popis: |
The slopes in southwest of China are high and steep. Moreover, their geological conditions and form history are complicated. Stability of slope was one the most important for the expressway constructions in these areas. Based on the excavation and reinforcement of rock slopes in DaoAn highway project, combining with the strata occurrence, calculation models of slope excavation are established. Then the comprehensive process of slope excavation was simulated. Site monitoring and testing were implemented, monitoring data such as surface displacement, vertical displacement, deep horizontal displacement and anchor cable force of three typical slopes during construction are analyzed. Then dynamic warning method and index of slope monitoring during the slope construction are studied. Based on designed safety factor and failure mode of slopes, combined with field monitoring and numerical simulation, a new method to determine the monitoring & early warning index was proposed. They could give references to evaluate the safety state of rock slopes during excavation. |
