山区高速公路边坡监测与动态化设计施工实例分析

据对中部某山区高速公路边坡的实际监测资料,结合勘察、设计、施工情况得出了各种不利边坡稳定的因素,分析了该边坡实际变形方式。选取具有代表性的边坡监测点,监测边坡变形、锚索受力和雨量,以反应出边坡在开挖后的实际发展状态,进而对边坡变形的影响因素进行分析,对该边坡特有的反向坡体内部的变形做出解释。根据不同的边坡状态提出对该类型边坡的长期预警参考值。实际监测与研究结果表明,该边坡处于临界状态,容易受雨水、爆破施工等外界因素扰动,原有施工设计方案不完全适合于该边坡治理,优化后的设计施工方案成功完成了该边坡的抢险任务。

Case History of Monitoring and Dynamic Design and Construction of Highway Slopes in Mountainous Area

Highway slopes in a mountainous area in central China have been mornitored. The deformation characteristic of the slope is recognized based on analyses of various disvantageous factors affecting the slope stability associated with reconnaissance, design and construction. Three typical profiles have been selected and several representative points are chosen for monitoring slope deformation, stresses in anchors and rainfall. Based on the mornitored data that exhibit the deformation state of slope after excavation, the factors influencing the slope deformation are investigated and the reason is found for slope displacements in the direction downward and opposite to the slope inclination. On the basis of original design and construction of anchors, anti-sliding piles and drainage measures, long-term warning thresholds are suggested for this type of slopes under different states of stability. The analytical results show that the slope is at the critical state, susceptible to rainfall, blasting and other extrinsic factors, and the original scheme of design and construction is not appropriate for the treatment of this slope. By employing the modified scheme based on optimization, the slope has been successfully stabilized in time.