Numerical Simulation And Analysis Of Deformation And Failure Of Jointed Rock Slopes

With weak surface of the rock, its strength mainly controlled by the structure. It is very important for designing safe slopes and maintaining these slopes to analyze quantificationally and appraise the stability of slopes influenced by the primary facts. There are some traditional stability analysis methods, such as limit equilibrium method, limit analysis method, which exist some relative disadvantage.But RFPA-Slope analysis procedure basing on the Strength Degradation principle that considers the inhomogeneity of geomaterials, the tension and shear fracture mechanism, which made RFPA-Slope program analyze roundly the fracture model of geomaterials. It also simulates dynamically the gradual failure progress of the slope, search automatically the slide surface when the slope is breaking down. Thus in this thesis, the stability analysis of jointed rock slope was conducted by using the software RFPA-Slope as well as EMU-Slope program that is incorporated with strength reduction theory. The failure surface of slope and relevant safety factor were thus displayed directly. It was proved that the joints were the major influencing factor on the failure mode of jointed rock slope. In addition, the failure process as shown by RFPA-Slope is significantly meaningful for the investigation of failure mechanism of jointed rock slope. The case study indicates that RFPA-Slope can rather rationally predict both safety factor of slope and the corresponding shape and position of the potential slip surface. Accordingly, practical applicability of the proposed technique to complicated cases is verified.The following work is completed in this paper:1. Through RFPA analysis procedure basing on the strength degradation principle for a single crack, double-crack, multiple-crack interaction characteristics of the stress field analysis, research that when the rock with a single crack was loaded, in the crack tip which stress concentration area will be generated. And research failure mode when the concentration of stress to the ultimate strength of rock. With RFPA analyse interaction of double cracks.Finally with RFPA research the failure of multiple cracks.2. RFPA-Slope analysis procedure basing on the strength degradation principle was firstly introduced systematically, and then RFPA-Slope analysis procedure was applied to the stability analysis of rock slopes. At last validated with EMU-Slope procedure, the stability coefficient of rock slopes was right, thereby this showed that RFPA-Slope analysis procedure was very fit for analyzing the slope's stability.3. Through analyzing the distortion rule of rock slopes with single weak structure surface and double groups of weak structure surface with RFPA-Slope analysis procedure, and research how the factor that jointed rock through rate, geometric position, angle and the length of rock bridge and so on effect in slope failure.And how these factor effect the size of the safety coefficient.And finally proved jointed is a major factor undermining of rock slope failure.