某路堑高边坡稳定性评价及优化设计

镇清高速回龙寨服务区Ｋ９＋７００左侧属于典型破碎顺层软岩路堑高边坡，由于坡体岩质复杂，出现坡顶变形开裂和小型浅层土质滑坡等问题，施工过程中面临整体滑坡风险，由此产生边坡下部开挖及加固问题。以此高边坡工程为研究对象，利用历史和现状地面勘察的方法定性分析了潜在安全问题以及关键技术难题，基于坡体目前临界稳定状态，结合现场地质调查及参数反分析方法综合确定了现有条件下的边坡岩土力学参数，结合实际情况设计３种开挖及加固方案，并基于数值模拟方法综合评价了该边坡的稳定性。主要结论:不施加加固措施直接开挖和按初始加固设计的两种情况均不满足边坡稳定性安全控制标准；通过不同开挖及加固方案的费效性对比，开挖方案２在保证稳定的基础上最经济，为最优开挖加固设计方案。

Stability Evaluation and Reinforcement Measures Optimization of High Slope of Typical Broken Bedding Soft Rock Cutting

The left side of K9+700 in Hui Longzhai service area of Zhenqing high speed belongs to the typical soft rock road cutting slope along the broken strata. Due to the complex situation of the slope rock body, the slope roof deformation and cracking and small shallow soil landslide and other problems, the construction process is faced with the overall landslide risk, resulting in the excavation and reinforcement of the lower slope. This paper took the high slope engineering as the research object, the potential safety problems and the key technical problems were quantitively analyzed by using the method of history and present situation of ground investigation. The slope geotechnical mechanics parameters of the existing conditions were determined based on the critical stable slope body state, which is combined with field geological survey and comprehensive parameter back analysis method, the actual situation design three kinds of excavation and reinforcement scheme, and the numerical simulation method to comprehensive evaluation of the stability of the slope. The main conclusions are as follows: both the excavation without reinforcement measures and the initial reinforcement design do not meet the safety control standard of slope stability;through the cost-effectiveness comparison of different excavation and reinforcement schemes, excavation scheme 2 is the most economical on the basis of ensuring stability, which is the optimal excavation and reinforcement design scheme.