SLOPE STABILITY ANALYSIS AND MITIGATION ALONG CPEC ROUTE (KKH) BY USING ROCSCIENCE SLIDE MODELING;(A CASE STUDY OF LANDSLIDE AT HUMARRI, PAKISTAN

Abstract

Northern Pakistan is one of the most active and dangerous geological zones on the planet. As a result, several huge landslides have occurred in the area throughout history, destroying infrastructure, blocking the Hunza River, and seriously damaging the Karakoram highway. Due to the difficult logistics and wide distances involved, despite the high frequency of large-magnitude landslides and the subsequent destruction, the whole area remains understudied. Using the Limit Equilibrium Method, this study explores the slope failure along the Hunza River (HR), Village Humarri Nagar District Upper Hunza Gilgit Baltistan, Pakistan (LEM). Using Slide Rocscience programmer, the slope was fully studied for geological conditions, slope geometry, soil strength parameters, and FOS determination. Soil samples from the slope were gathered for analysis of geotechnical properties, and the slope's geometry was also analysed during the excursion. Moisture content (w) 1%, specific gravity (Gs) 2.64, unit weight (r) 19kN/m3, angle of internal friction (AIF) 30 and cohesion (c) 69 kPa are the strength parameters of the soil sample. The Humarri active landslide soil was classed as sandy silt with the group sign ML by the Unified Classification System (UCS). In Slide Rocscience programme, the FOS of the slope was calculated using LEM with the assumption of ordinary (O), Janbu (J), and Bishop (B) techniques. A set of instances were used to calculate the influence of Pore Water Pressure (PWP), Unit Weight, Cohesion, Angle of Internal Friction, and Overburden on FOS. FOS increases when cohesiveness and angle of internal friction rise; yet, FOS increases as unit weight and overburden of overlying materials grow. Furthermore, while PWP has some good effects, increasing it causes a significant decline in FOS. Because every FOS is larger than 1, the Humarri active landslide is judged to be stable in its current form based on available strength metrics and simulated slide conscience results.