The Effect of Rectangular Joint Interfaces on the Meso-mechanical Behavior of Granite-concrete Composite under Axial Compression
Considerable random and irregular joint interfaces are formed during the construction of rock mass surface,which is the key to the stability of rock-concrete composite.In this paper,based on uniaxial compression test of granite-concrete composite materials with horizontal smooth interface,the particle discrete element program PFC2D is used to model and calibra-tion parameters.Considering the rectangular joint interface with different joint inclination angle and aspect ratio,the orthogonal design method is used to conduct a mesoscale simulation study on the axial pressure behavior of granite-concrete composite with irregular rectangular joints.The results show that with the increase of joint inclination angle,the peak stress and elastic modulus of the assembly show a"V"trend,and the increase of joint inclination angle has a significant influence on the stress-strain curve,while the increase of aspect ratio will change the peak stress and strain at the same joint inclination angle.The increase of joint inclination angle will change the number and distribution area of cracks,and the final failure mode of the assembly will gradually change from compression failure to shear-slip failure with the change of inclination angle.Moreover,the through main fracture is concentrated at the corner of the rectangular joint,and the expansion along the corner point leads to the final failure of the model.At the same time,a constitutive equation considering the aspect ratio and joint inclination angle is established.
rectangular joint interfacegranite-concrete compositeaxial compressive behaviorparticle discrete element
万方数据
维普
