Western Ghats (WG) in India is endowed with one of the most distinctive and picturesque mountainous landscapes. The region encounters unprecedented rain and non-engineered excavations (especially along highway cut slopes), that turns out to be detrimental to the stability of rock and soil slopes. The present research focuses on accounting the vulnerability condition of rock slopes of differential deterioration intensities along National Highway corridor 66 (NH 66) at Ratnagiri–Sangameshwar (RS) stretch. Rock mass and associated slope stability condition were encapsulated, and studied locations were classified using different geo-engineering classification (GEC) systems such as RMR (Rock Mass Rating), SMR (Slope Mass Rating), CSMR (Continuous Slope Mass Rating), GSI (Geological Strength Index) and RDA (Rock slope Deterioration Assessment). The study introduces a new class in RDA for igneous rocks that are susceptible to high deterioration. Some useful insights have been added and discussed in the light of deterioration-induced block failures which have been integrated with detailed kinematic analysis. The present study recommends that RDA would prove more efficient and informative in the preliminary stage of slope stability investigation for high deterioration susceptible igneous rock masses as compared to other geo-engineering systems.

印度的西高止山脉（WG）被赋予了最独特和风景如画的山区景观之一。该地区遭遇前所未有的降雨和非工程开挖（尤其是沿高速公路切开的斜坡），结果不利于岩石和土壤斜坡的稳定性。本研究的重点是在拉特纳吉里–桑加美什瓦（RS）伸展带沿国道66号公路（NH 66）沿不同劣化强度变化的岩质边坡的易损性条件。封装了岩石质量和相关的边坡稳定性条件，并使用不同的地球工程分类（GEC）系统对研究位置进行了分类，例如RMR（岩石质量等级），SMR（边坡质量等级），CSMR（连续边坡质量等级），GSI （地质强度指数）和RDA（岩质坡度恶化评估）。该研究针对易变质的火成岩引入了RDA中的新类别。根据恶化引起的块故障，已经添加了一些有用的见解，并进行了讨论，并结合了详细的运动学分析。本研究建议，与其他岩土工程系统相比，RDA在坡度稳定性调查的初期，对于易变质高火成岩岩体，将被证明更为有效和有益。