Rock mass modulus deformation analysis in USAID highways segment km 27th to km 30th based on rock mass classifications

Rock mass modulus deformation and rock mass classifications utilizing RMR (rock mass rating) and GSI (geological strength index) have been conducted in USAID Highways segment from km 27th to km 30th where is built on the rocks which are highly influenced by tectonic force and deformed by tectonic activity; hence, the rock on the slopes are fractured, folded and potentially to failure. These circumstances need a rock engineering approach by applying rock mass classification methods. This research aims to identify the rock mass classifications based on RMR, GSI, and to estimate the rock mass modulus deformation working on rock slope of argillaceous limestone. Scanline approach was utilized in structural geology data acquisition for rock slope kinematic analysis and joints condition (persistence, aperture, roughness, infilling, weathering, and watering) included the strength of intact rock is obtained from rock slope in calculating the RMR and GSI ratings. The empirical approach was deployed in estimating the rock mass modulus deformation based on GSI value. Rock slope kinematic analysis reveals the possibility of rock failure that will be occurred on the slopes are plane, toppling, and wedge failures. The total RMR ratings are 60, 64, 60, and 61 for slope 1, 2, 3, and 4, while the total GSI values are 50, 51, 52, and 54 respectively. Rock mass modulus deformation for argillaceous limestone in this study area is 50 GPa for every slope. weathering, and watering) included the strength of intact rock is obtained from rock slope in calculating the RMR and GSI ratings. The empirical approach was deployed in estimating the rock mass modulus deformation based on GSI value. Rock slope kinematic analysis reveals the possibility of rock failure that will be occurred on the slopes are plane, toppling, and wedge failures. The total RMR ratings are 60, 64, 60, and 61 for slope 1, 2, 3, and 4, while the total GSI values are 50, 51, 52, and 54 respectively. Rock mass modulus deformation for argillaceous limestone in this study area is 50 GPa for every slope.