Abstract The present research work investigates the slope instability along NH-05 near Jhakri, Himachal Pradesh, India. Initially, field investigation has been conducted to study the slope morphometry and characteristics. The studied landslides trends along NW–SE direction with height 27.26 m from the road surface and at an angle of 63° vertically post failure. Parameters responsible for slope stability such as particle size distribution, Atterberg Limit and shear strength parameters were collected through direct shear plot using soil samples collected from field. The results reveal that the soil coarse to fine loamy with no surface vegetation long the landslide areas. The absence of vegetation exposes the soil for erosion during high monsoon rainfall. Based on the shear test results the value of c and Phi is 10.28 kPa and 18.8°. 2 D limit equilibrium model has been used using Rocscience software for slope stability assessment. LEM model reveals a safety factor value 0.43 which is less than the value considered for stale slopes. Re-enforced bench slope with soil nailing has been suggested as a suitable stabilization measure with a FOS value of 1.2 which reveals the slope can be stabilized with the mentioned approach.

中文翻译：

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印度喜马拉雅地区沿不稳定道路切割斜坡的泥石流的特定地点地质和岩土工程调查

摘要 目前的研究工作调查了印度喜马偕尔邦贾克里附近 NH-05 沿线的边坡失稳。最初，进行了实地调查以研究坡度形态学和特征。所研究的滑坡沿 NW-SE 方向发展，距路面高度为 27.26 m，破坏后垂直角度为 63°。使用从现场收集的土壤样品，通过直接剪切图收集负责斜坡稳定性的参数，例如粒度分布、阿特伯格极限和剪切强度参数。结果表明，滑坡区的土壤为粗到细壤土，没有地表植被。在季风降雨期间，植被的缺失使土壤暴露在侵蚀之中。根据剪切试验结果，c 和 Phi 的值为 10.28 kPa 和 18.8°。二维极限平衡模型已使用 Rocscience 软件进行边坡稳定性评估。LEM 模型显示的安全系数值为 0.43，该值小于为陈旧斜坡考虑的值。已建议使用土钉加固台坡作为合适的稳定措施，FOS 值为 1.2，表明可以使用上述方法稳定斜坡。