A new continuum based model for the simulation of a seismically induced large-scale rockslide
A powerful earthquake can actuate large number of landslides which can cause serious economic and person loss. Understanding the mechanism of such seismically induced landslide failures and the resulting landmass runout is crucial for the design of suitable preventive measures. In nature rock slopes occur in a very complex physical form and it becomes irrational to analyze their behaviour based on simplified analytical models, therefore numerical models are prepared to reflect upon their characteristics more precisely. Numerical models for rock slopes can be classified either as a discontinuum or continuum based model. In present study, a numerical analysis has been performed to simulate the post-failure behaviour of a rock slope problem which is subjected to multi-direction seismic forces for which a continuum model has been adopted. Dynamic Finite Element method available in ABAQUS was used as the computational solver. Since rockslide is a large deformation problem, traditional Lagrangian finite element formulation is incapable of correctly simulating such phenomenon because of problems relating to mesh entanglement and mesh distortion. To address this problem, the Coupled Eulerian Lagrangian (CEL) method has been used in present study. Lagrangian description is given to the stable base block, while Eulerian description is given to the fluid like sliding mass. The seismic motion is applied as a transient boundary condition on the base block. Results showed that seismicity has a major influence on failure of the rock slope. Furthermore, post-failure behaviour of the rock slope reproduced by the CEL based continuum model is fairly in agreement when compared with the results procured from conventional discontinuum modelling approach. The paper thus introduces a continuum modelling approach for analyzing the propagation of rockslides which typify large deformation.
D. Shirole C. Moormann K.G. Sharma
Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi-110016, India;Insti Institute of Geotechnical Engineering (IGS), University of Stuttgart, Stuttgart-70569, Germany Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi-110016, India
国际会议
西安
英文
180-191
2016-05-25（万方平台首次上网日期，不代表论文的发表时间）