Proceedings of IOE Graduate Conference, 2017 Volume: 5 ISSN: 2350-8914 (Online), 2350-8906 (Print) Analysis of Landslides and Slopes (Nepalthok–Khurkot section) using SVSLOPE model and Remediation using Soil Nail Ojaswi Sharma a , Indra Prasad Acharya b a, b Department of Civil Engineering, Pulchowk Campus, IOE, TU, Nepal Corresponding Email: a sharmaoju93@gmail.com, b indragb@gmail.com Abstract Landslide and slope failure, a specific category of geomorphological calamitous events endangering human life and property, are recurrent phenomenon and repeated withering risks in the Nepalese Himalaya. The study area incorporated in this paper for slope analysis comprises of two slopes as: Landslide slope (ch.82+835 to ch.82+885 (from Dhulikhel)) stretches up to 50m and critical slope (ch.79+060 to ch.79+220 (from Dhulikhel)) stretches up to 160m. The objective of the study has been focused primarily in analyzing the mechanism and contributing to the reduction of risk posed to human life and economic values through mitigation measures because of landslides and slope instability. Fundamentally, the commencement of this research has been with field mapping, data collection and soil sample collection with the material properties being determined from laboratory and consequently verified by various literature. SVSLOPE 3D model has been the major tool for analysis of both slopes and soil nailing has been proposed as a remedial measure for risk reduction. Numerical verification of both slopes have been done using PLAXIS-3D and parametric verification of nail has been done using PHASE and literature along with sensitivity analysis of parameters being carried out. Keywords Landslide – slope failure – soil nailling – SVSLOPE–PLAXIS–PHASE 1. Introduction 1.1 Background Slope stability analysis are performed to access the safe and economic design of human made or natural slopes. Slope stability are generally assessed in terms of factor of safety, if FOS is greater than one it is considered to be stable otherwise remedial measures are used to stabilize the slope. Method of analysis of slope include: Limit Equilibrium Method and Finite Element Method. LEM is mostly used method for analysis of slope despite a lot of prior assumption. On the other hand FEM has less prior assumption and also uses complex phenomenon for safety calculation. If slope has factor of safety less than one than careful analysis of mitigation measure and appropriate choice of mitigation measure is vital. Traditionally different measures have been practiced in slope stability like anchor, grouted tieback etc and soil nailing is one of the recent development in stabilization of slope. Soil nailing shows significant promises however, very scatter research has been made on the field of soil nailing. This paper attempts to explore various aspects of nail stabilized slopes (where should nail be positioned in the slope, at what inclination nail should be used) as to make them as engineering solution. 1.2 Study area Study area considered in this paper is BP highway (Banepa- Bardibas), within it Nepalthok-Khurkot section is taken which is aligned along Sunkoshi river valley. Two slopes are considered one as landslide slope (actual landslide area) and other as critical slope (probability of failure is high, as there is unequal distribution of soil mass along the slope). Characterstics of slope: latitude, longitude, altitude at top and base(ft), slope length(m), chainage(from Dhulikhel(Km+m))- 27.33861, 85.99358, 1627,1662,50,82+835 and Pages: 581 – 587