The mechanical characteristics of the structural plane are determined by surrounding rock structure,the location and tensile strength of the structural plane significantly affect the propagation of stress waves in rocks.In this research,sandstone was used as the research sample,and laboratory experiments were performed to invesiti-gate the failure characteristics of the surrounding rock with low stress wave transmission structural planes.The ABAQUS/Explicit numerical model of the surrounding rock with high stress wave transmission structural planes was established.The experimental results were used to verify the model.The failure characteristics of the overall chamber's surrounding rock under different conditions of high transmission structural plane tensile strength,posi-tion,and incident wave amplitude were studied.With the increase of the tensile strength of the structural plane,the length of the surrounding rocks'spallation with low stress wave transmission structural planes gradually de-creases,while the spall length of the high stress wave transmission structural planes is irrelevant to the tensile strength of the structural plane.The surrounding rock with high stress wave transmission structural planes often fails before the structural plane under the disturbance of stress waves,which is different from the mode that the structural plane fails before the surrounding rock in the experiment of rock bars with low stress wave transmission structural planes.When the high stress wave transmission structural plane is far away from the free end in the chamber's surrounding rock,it does not affect the location of spallation.When it is close to the free end,only the structural plane fails.With the increase of stress wave amplitude,the failure modes of surrounding rock with the high stress wave transmission structural planes are:no failure,intact surrounding rock-structural plane tensile failure,and surrounding rock spalling failure-structural plane tensile failure.The results are important for the safety and stability of underground chambers.
国家科技期刊平台
NSTL
维普
万方数据
