Abstract
To research the macroscopic deformation of rock microseismic damage, a high-precision microseismic monitoring system was established on the left bank slope of the Baihetan hydropower station in Southwestern China. Based on the microseismic monitoring and field deformation data, the seismic source radius was applied to characterize the rock fracture scale. Numerical simulations introduced the rock micro-fracture information into the three-dimensional numerical model of the left bank slope and established the damage constitutive model. The unloading deformation process of the left bank abutment rock mass is described by numerical calculations. The feedback analysis method considering the effect of microseismic damage is preliminary exploratory research, which provides a new idea for the stability analysis of similar high rock slopes.
Highlights
Slope stability analysis is an old and complex subject
We have considered the main geological that are conducive to the numerical simulation analysis
Based on the damage-constitutive relationship considering the scale of rock failure, the deformation feedback analysis of the surrounding rock of the left bank slope of Baihetan hydropower station was carried out
Summary
Slope stability analysis is an old and complex subject. Slope stability analysis methods mainly include the engineering geological analysis, model testing, limit equilibrium, limit analysis and numerical simulation methods. Li et al [3] combined numerical simulation and on-site monitoring methods to evaluate the stability of a rock mass. Sheng et al [11] used the high slope project of the Three Gorges ship lock as the background, established a numerical model considering the excavation influence, simulated excavation unloading of the high slope, optimized the results by using a neural network and genetic algorithm, and obtained the rock mass mechanical parameters and stress field. It is of great significance to accurately grasp the uncertain random distribution of rock parameters and to establish a reasonable model for the numerical simulation of slope stability evaluation. Based on Monte Carlo technique, Pasculli et al [15,16,17] studied the uncertainty of rock’s mechanical parameters, established a numerical model and simulated slope stability by combining the finite difference method. The functions of the FLAC3D software were expanded, providing a new idea for the quantitative evaluation of rock mass damage during the excavation of rock slopes
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