Numerical Modelling of Boulderly Soil Using Finite Element For Slope Stability Analysis
- 1. NUMERICAL MODELLING OF BOULDERLY SOIL USING FINITE ELEMENT FOR SLOPE STABILITY ANALYSIS Sugianto, A.1 , Rahardjo, P.P.2 ABSTRACT: Slope stability in common practice is conducted in homogenous soil or rock material, especially in Indonesia. For homogenous soil, design parameters are obtained by soil investigation and laboratory test. In case the materials are dominantly consists of heterogenous material which is defined as boulderly soil, the soil sampling will be difficult. Finite element modelling is powerful to determine characteristic of boulderly soil by making triaxial simulation test with incremental rock/gravel toward clay. It is found that shear strength of boulderly soil will higher along with increasing of rock/gravel content. From the numerical results, it will serve stress-strain characteristic of boulderly soil then calculate the cohesion and friction angle under Mohr-Coulomb model by GTS Midas. As a result, the strength parameters are implemented to analyze the slope stability in boulderly soil slope cutting. Sliding plane are compared between boulderly soil with combination parameters which is obtained from numerical modelling with realistic rock modelling in Plaxis 2D. Realistic rock modelling shows sliding plane is influenced by rock material and not defined as circular sliding plane which is shown when using combination parameters from numerical simulations. Keywords: Slope stability, Boulderly soil, Triaxial simulation test, Mohr-Coulomb Model, Sliding plane 1 PT. GEC, Bandung, currently M.T. student at Parahyangan Catholic University, email: andysugianto.sorong@gmail.com 2 Professor, Parahyangan Catholic University, Jl. Ciumbuleuit No. 94, Bandung, Indonesia