ABSTRACT
Steep slopes, poor geology, and increased pore water pressure are the main causes of devastating landslides in the Nepal Himalaya, which create serious challenges to the development of critical road infrastructure. An important road section, Nagdhunga-Naubise road section of Prithvi Highway, connecting Kathmandu to rest of Nepal, faces major disturbance during Monsoon season particularly due to movement of soil mass. Recent flood occurred on September 2024 causes the landslide and debris flow along and across the road section, buried vehicles and death of 40 people. In this study, Jhyaple Khola site (around 15 km far from Kathmandu city) at Nagdhunga-Naubise road section is considered as critical for landslide and soil movement. Also, the case study involves the mitigation of soil erosion using lateral and vertical restraints to prevent movement of road section. The lateral and vertical restraints involve the use of I-section micro-pile driven vertically on the slope ground at valley side. The I-section micro pile was cement grouted with w/c ratio of 0.4. This paper aims to study the construction scenario of I-section micro pile drilled vertically, as new approach to mitigate the soil erosion on slope ground in Nepal Himalaya.
