Abstract:
Rock slope failure at Kandy -Colombo highway near Peradeniya
town has been identified as a major threat to the highway as well as the people and
properties of the vicinity. This study proposes a permanent mitigation plan for the
rock slope failures at this site. Study was initiated with the analysis of similar case
studies and field studies on the site area and mitigation options. Two level surveys
were carried out to collect topographical data for preparation of a 3D model of the
slope. Material identification was done by using particle size analysis and plasticity
tests; direct shear tests were carried out to determine the friction angle, cohesion and
density of the material. Mitigation plan was designed according to the site
conditions. The design was analysed for nine sections on the slope for its stability
with the test results by using Geo-studio 2004 software. Reinforcements were
proposed to improve the stability whenever needed. An appropriate drainage
system was also designed having analysed the past rain fall data of the area. The
proposed mitigation plan in this study is a highly stable, safe, trouble-free and
economically feasible one, and that can be implemented on this site.
Citation:
Premathilaka, K.K.W., Munasinghe, M.P.N.J., Kasthurirathna, K.A.N.S., Kumara, A.L.D.P., Senapathi, L.R., Abeysinghe, A.M.K.B., Premasiri, H.M.R., Chaminda, S.P., Puswewala, U.G.A., & Wijewickrama, M.I.D.H. (2010). Structural mitigation for stabilizing rock slope failure at Peradeniya on Colombo- Kandy Main Road: geotechnical and constructional aspects. In N. P. Ratnayake, A.M.K.B. Abeysinghe, H.M.R. Premasiri & S. Karunaratne (Eds.), Proceedings of the 5th Annual Conference on Earth Resources for National Development (pp. 41-44). Department of Earth Resources Engineering, University of Moratuwa.