The roadway networks serve as arteries for the ongoing socio-economic activities within the Himalayan region. The perilous conditions of geologically active and fragile terrain are sustained threats to various disasters, including landslides. Large numbers of casualties and fatal incidence associated with landslides are being reported every year. The stability of road cut slopes is a crucial component for safer mobility and transportation activities. To attain a hassle-free and hazard-resilient design along the critical transportation route, a schematic and rigorous geotechnical investigation has been undermined. The present case study was undertaken to envisage cut slope stability and optimal designing of engineered slopes along the national highway-94 (NH-94) from Rishikesh to New Tehri, Garhwal Himalaya, India. The major issues associated with road cut slope failures are getting highlighted. Various rock mass classification systems including rock mass rating (RMR), slope mass rating (SMR) and its extensions, geological strength index, and Q Slope method were used to determine the prevailing stability. Stable slope angle without any reinforcement are suggested for the different probability of failure. Failure pattern was also assessed by applying kinematic analysis. Modified RMR for slopes is suggested by adjusting the orientation factor by using kinematic feasibility. Numerical simulation technique was also applied to determine safety factor. Exponential relationships are derived among Q Slope, SMR, and strength reduction factor. The guidelines to improve safety in terms of landslides are also suggested by considering the outcomes obtained by different methods.

公路网是喜马拉雅地区正在进行的社会经济活动的动脉。地质活跃而脆弱的地形的危险条件持续威胁着包括山体滑坡在内的各种灾害。每年都报告与滑坡有关的大量人员伤亡和致命事故。道路坡度的稳定性是更安全的出行和运输活动的关键组成部分。为了在关键的运输路线上实现无忧且防灾的设计，破坏了原理图和严格的岩土研究。本案例研究的目的是设想从瑞诗凯诗（Rishikesh）到印度Garhwal Himalaya的New Tehri的94国道（NH-94）沿线的边坡稳定性和优化设计的工程边坡。与道路坡度破坏相关的主要问题日益突出。各种岩体分类系统（包括岩体额定值（RMR），边坡质量评级（SMR）及其扩展名，地质强度指数和Q坡度方法）用于确定主要的稳定性。对于不同的失效概率，建议采用不加任何加固的稳定的倾斜角。失效模式也通过运动分析来评估。建议通过运动学上的可行性来调整方向系数，以对坡度进行修正的RMR。数值模拟技术也被用于确定安全系数。在Q斜率，SMR和强度折减系数之间得出指数关系。