Elastic Plastic Finite Element Numerical Analysis For Reinforcing High-Slope Of Road Base

Slope stability depends upon two factors, material properties and change of the landscape of the slope. Due to the complexity, diversity and non-uniformity of the geological conditions, slope design in road engineering can only be a practice involving prevention as well as risk of failure. It has been shown that FEM is a useful means to simulate the change state of the slope during construction. If properly applied, it can serve as a guidance or reference to the to the design and construction of the slope.Having studied carefully data collected in the field during the construction, commercial software-ANSYS is used to simulate the excavation and anchoring of the slope at K2791 of Er-kang section of state highway G318, using elastoplastic theory as the basis. Based on the field investigation situation, it is decided that the slope of K2791 should be classified as collapse and normal regions in order to study and compare features of deformations and stabilities in these two different areas. In the study, variations of slope deformations along the slope were given as an indication of slope displacements, while slope stability was indirectly related to the yield function value of Drucker-Prager criterion in which yield region is one where yield function values were beyond zero. Finally, the calculation results were compared to the field data.Numerical simulation results show that a continuous yield region extends from the top to foot of the slope. According to the simulation results, slope surface in the collapse area moves outward the slope during excavation. It is found also that yield areas does not change significantly. Therefore, it is induced that sizable collapse is inevitable if reinforcements were not applied in time. Results further show that application of prestressed cables plays a key role in the reduction of yield areas, making the surface rock moving inward the slope. It is thus to confirmed the significant improvement of slope stability. For the normal area, slope stability was improved by both excavation and reinforcement, though influence of the latter was more apparent. As for the trend of deformation...