Monitoring And Stability Analysis Of Xiaopanling High Rock Slope During Construction

The current situation of China's economic is in a period of rapid development, with the development of the national economy, increasing road grade, high filling and deep digging roads is inevitable. Highway construction under increasingly complex terrain conditions as complex high rock slope is increasing. Due to the high rock slope which in the construction occurs instability easier, which not only cause substantial economic losses, but also cause some casualties. Therefore, monitoring and stability analysis of high rock slope during construction has a very important practical significance.This article uses Xiaopanling high rock slope in the seventh contract section of Jianxing highway in Liaoning province as the engineering background. First summarized the rock slope's damage type, factors affecting stability and geomechanical rock slope deformation and failure mode, identify the main factors affecting Xiaopanling slope stability. Then combine numerical simulation and on-site monitoring as the method of research.Using digital photogrammetry technology to collect, analyze and classify information of structural surface of high rock slope. Then use the collected information of structural surface in discrete element software 3DEC to simulate the process of slope construction and analyze its stability and predict its deformation. Meanwhile through the fourth, the third stage of the construction process of slope deformation monitoring feedback contrast verification. Validate the numerical simulation method in line with the actual situation, continue to the next level slope excavation situation to predict and optimize the next level Slopes design.Studies have shown that, after the third stage of excavation slope excavation Z direction 0-15m slope surface area began to cut the plastic zone appears, but still maintain overall stability. Displacement vector of the second stage slope excavation, the velocity vector heavily concentrated in the Z direction on the excavation face jointed slope 0-15m area, and showed increasing trend vector size, there have been local buckling damage. Tier slope excavation process, most of the region have undergone significant displacement of the slope, and the displacement vector, velocity vector have continued to increase, then the overall slope instability failure occurs.For the slope, we propose optimized layout program of monitoring points. Slope along the direction 0?15m area increased monitoring points,16?50m area to reduce the monitoring points.After optimization, the number of monitoring points is reduced from 20 to 12. Numerical simulation of slope conditions and through different design options to determine the fourth grade slope supporting the design without adding to bolt. The third stage longer bolt length along the slope direction 0-15m area from 8m to 12m, along the direction of 16-50m spacing area to relax bolting from 2m to 5m. So as to achieve the assurance engineering safety, reduce the difficulty of construction, engineering measures aim to ensure a reasonable economy.