Complex Rock Mass Sloped Damage And Fracture Failure Mechanism

Complex rock slope refers to the rock slope, which contains multi-group fissure,has poor mechanical properties and the stability determined by the fissure. China is amountainous country, with mountainous areas taking up2/3of the national total area.The rock slope failure is one of the familiar geological hazards, thus, the rock slopefailure usually renders a serious risk to human life and property loss. This papersupported by two National Natural Science Foundations: study on perilous rock failuremechanism (50678182) and study on the mutation mechanism and excitation effect ofperilous rock failure (11272185). Taking the complex gentle incline rock slope as theresearch object and basing on fracture mechanics, damage mechanics, elasticity andfinite element, this paper has studied on the damage and fracture mechanism of perilousrock, recession mechanism of rock cell and plane&3D failure mechanism of complexrock slope. The innovation achievements are obtained as follows:(1) Based on fracture mechanics and reliability basic principle, it establishedoptimization solution method of perilous rock reliability. With the change of depth andobliquity, standard deviation of depth and fracture toughness, it analyzed the variationlaw of the reliability index and unstable probability for perilous rock. According to thefracture mechanics, heat transfer theory and elastic mechanics, it established thecalculation method for the temperature field and stability of perilous rock, whichstability considered the coupling effect between the temperature and stress. Moreover, itrevealed the variation law of perilous rock’s stability under the combined effect oftemperature and the depth of perilous rock.(2) Basing on elastic mechanics, damage mechanics and heat transfer theory, itestablished the calculation method for damage factors of soft rock, analyzed the failuremechanism of soft rock; revealed the distributing law of temperature field for soft rockand established the calculation method for stability of perilous rock and the damagefactor for dominate fissure in the process of rock cell recession.(3) To respectively regard Complex rock slope as a plane problem andthree-dimensional problem, based on fracture mechanics and material mechanics,according to the contact relationship of rock layers, it calculated the pressure andfriction between the rock layers with the intermediate variable of rock layers’ deflection.And then it established the calculation method for block’s plane stability coefficient,calculated the pressure, friction and rotation angle between the rock layers with the intermediate variable of rock layers’ deflection and rotation angle and founded thecalculation method for block’s three-dimensional stability coefficient. At last, throughthe numerical simulation, it verified the effectiveness of the calculation method for thestability coefficient of block which was established in this paper and analyzed failuremechanism of complex rock slope under various depth of rock cell.The achievements can be used in the prevention and control of complex rock slope.It provides theoretical basis for the early warning of complex rock mass slope and thelayout of prevention and control engineering. Moreover, it enhances the pertinence andeffectiveness for prevention and control engineering.