某挖方边坡失稳机理分析与处治方案设计

ANALYSIS OF INSTABILITY MECHANISM AND DESIGN OF TREATMENT PLAN FOR A CUT SLOPE

山区公路挖方边坡失稳是常见的地质灾害,对公路建设安全产生极大威胁。文中以某公路K0+520~K0+620段左侧挖方边坡为案例,深入分析了边坡的变形特征和失稳机理。研究阐述了降水、施工开挖以及地形地貌对边坡稳定性的影响,同时根据钻孔资料确定滑面位置,并利用岩土力学参数反算方法,系统评估了失稳风险。从卸载和支挡两个方面,提出3种防治方案,从安全、经济和环保的角度进行比较,最终确定了双排抗滑桩方案。方案的实施有效改善了边坡的稳定性,确保了施工进度。不仅揭示地形和地质特征对边坡稳定性的重要影响,同时多角度地给出了相应的防治方案,为公路工程建设提供有价值的借鉴和参考。

The instability of cut slopes in mountainous road construction is a common geological hazard that poses significant threats to road safety.Using a left cut slope segment from kilometer point K0+520 to K0+620 of a specific highway as a case study,this research delves into the deformation characteristics and mechanisms underlying slope instability.The influences of precipitation,excavation activities,and terrain on slope stability are studied.The bore-hole data is employed to determine the location of the sliding surface and a back-calculation method is utilized for geotechnical parameters,and the research systematically assesses the risk of instability.Three mitigation proposals are presented for addressing both unloading and support aspects.The proposals are compared from the perspectives of safety,economy,and environmental conservation,culminating in the endorsement of a dual-row anti-slide pile scheme.Implementation of the scheme effectively enhances slope stability and ensures construction progress.The study not only unveils the significant impacts of terrain and geological features on slope stability but also offers com-prehensive mitigation solutions from multiple angles.Consequently,it furnishes valuable insights and references for highway construction,demonstrating the research's significance in both theoretical and practical realms.