福建山区某典型路堑高边坡滑动变形机理分析

福建境内某高速K85边坡为典型福建山区路堑高边坡，在治理过程中边坡出现开裂与局部溜塌，形成滑坡病害，影响线路的顺利通车，故对该边坡的变形机理研究对类似边坡的治理具有重要意义。本文通过对该边坡地质环境及开挖过程变形的分析来阐述其变形破坏机理，表明其变形破坏模式为上覆风化岩土体沿其下伏基岩顶面产生的滑动变形和破坏。采用有限元数值模拟对设计方案和实际施工工况进行稳态分析，并结合现场监测成果印证该类边坡的变形机理。同时，分析了该类边坡治理过程的风险防控节点。最后，针对滑坡失稳情况进行边坡防治加固方案优化，以数值模拟和新设监测孔监测成果验证优化方案合理可行。

ANALYSIS OF SLIDING DEFORMATION MECHANISM OF A TYPICAL HIGH CUTTING SLOPE IN THE MOUNTAIN OF FUJIAN PROVINCE

The K85 slope is a typical high cutting slope in the mountain of Fujian province, which is located in an expressway of Fujian province. During the slope treatment, there appeared cracking deformation and partially collapse, and formed a landslide disaster. The landslide affected the smooth opening of the line. So, for the similar slopes, it is great significance to study the deformation mechanism of this slope. In this paper, by analyzing the geological environment of the slope and the deformation of the slope excavation, the deformation and failure mechanism is described. It indicates that the deformation and failure mode is that the overlying weathered rock mass along the underlying rock surface caused the sliding deformation and damage. It uses finite element numerical simulation to analyze the steady-state of design schemes and actual construction conditions. And combining with on-site monitoring results, it confirms the deformation mechanism of these slopes. Meanwhile, it analyzes the risk prevention and control nodes about the treatment process in this kind of slope. Finally, the slope prevention and reinforcement scheme is optimized for the instability landslide. And, it is reasonable and feasible to verify the scheme by numerical simulation and new monitoring results.