Effect of hole shapes on mechanical behavior of layered rocks using FDEM numerical method
To reveal the influence of hole shapes on the mechanical behaviors and failure modes of layered rocks,a series of numerical simulations were carried out using the combined finite-discrete element method(FDEM).Firstly,the basic principle of FDEM simulation of layered rocks was introduced,and then the uniaxial compression simulation of intact samples with different foliation angles was carried out,and compared with the experimental results.Finally,a series of uniaxial compression simulations were carried out for layered rock samples(β=0°,30°,45°,60°,and 90°)with circular,elliptical,triangular,rectangular,and square holes.The results show that for samples with different hole shapes,the compressive strength and the damage degree of samples show a V-shaped change trend with the increase of foliation angles,and the compressive strength reaches the maximum when the foliation angle is 0°,and the damage degree is the most serious when it is 90°.The existence of holes seriously deteriorates the mechanical properties of the samples,and the weakening extent is closely related to the shape of holes.The weakening ability to compressive strength of square and circular holes is the weakest.The failure modes of samples containing holes with different shapes are mainly divided into tensile-shear mixed failure across the bedding plane(β=0°),tensile-shear mixed failure along the bedding plane and across the bedding plane(β=30°),shear failure along the bedding plane(β=45° and 60°)and tensile-shear splitting failure along the bedding plane(β=90°).
combined finite-discrete element methodlayered rockhole shapesuniaxial compression simulationmechanical behavior
万方数据
维普
