Parametric Analysis Based Mitigation Charts of Chure Landslides in Finite Element Framework

Abstract

Chure region which lies south to main boundary thrust consists of large number of landslides and site specific analysis of each landslides is practically not possible. Hence the general form of solution is essential to address landslide mitigation in Chure region. Chure landslides mitigation models have been prepared in finite element framework. Finite element method which computes the strain and deformation of the elements by strain reduction technique has been used. Mitigation measures have been proposed in the forms of specific and general solutions. General mitigating charts have been developed with the model geometry proposed by Tiwari et al. (2013) and variations have been made in the cohesion, frictional angle and angle of slope in the soil ranges found in Chure landslide region. In addition, the general solution includes vegetation effect of effective root depth 1m and 2m along with retaining wall and slope modification have been made in different soil slope condition (dry, ground water table at surface, at 2m and 4m below the surface). Athuwa khola and Ahale landslides of Sindhuli District have been selected as the site specific solutions to validate the Chure mitigation models for general solutions. It has been found that the charts holds good for all slope and soil slope conditions. Thus, general solutions can be employed to explore the quick mitigation measures of Chure landslides.