Effect of combined dip angle on dynamic mechanical properties of combined rock mass with hard and soft media
WANG Yanbing1，SONG Jiahui1，YANG Liu1，ZOU Baoping2，REN Bin1，LI Linqing1
(1. School of Mechanics and Civil Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；
2. School of Civil Engineering and Architecture，Zhejiang University of Science and Technology，
Hangzhou，Zhejiang 310023，China)
Abstract：In order to explore the dynamic response characteristics of the rock mass with different combined dip angles under impact load，the dynamic impact tests of the rock mass with six different combined dip angles of granite and sandstone were carried out by using the separated Hopkinson pressure bar(SHPB)，high-speed camera and discrete lattice spring method(DLSM). The stress wave propagation characteristics，stress-strain curve difference，energy dissipation law，damage evolution characteristics and the relationship between total kinetic energy and crack propagation of rock mass with six different combination dip angles were studied. The results show that the dynamic mechanical properties and energy dissipation law of the combined rock mass are related to the combined dip angle. When the combined dip angle increases from 0° to 75°，the transmitted wave amplitude，peak stress and dynamic elastic modulus of the specimen increase first and then decrease，while the reflected wave amplitude decreases first and then increases. When the combined dip angle is in the range of 45°–60°，the combined rock mass of hard and soft medium is easy to be destroyed. Combined dip angle will not only hinder the stress wave propagation but also affect the stress change of rock on both sides of the bonding surface，resulting in secondary loading phenomenon of rock on both sides of the bonding surface. The damage value of rock mass presents an inverted "V" shape with the increase of combination dip angle，and the damage value is the highest in the range of 45°–60°. The larger the combined dip angle is，the lower the total kinetic energy in the rock mass failure process，the less cracks，and the smaller the deformation and displacement of the specimen.
王雁冰1，宋佳辉1，杨 柳1，邹宝平2，任 斌1，李林青1. 组合倾角对软硬介质组合岩体动态力学特性的影响[J]. 岩石力学与工程学报, 2024, 43(S1): 3342-3353.
WANG Yanbing1，SONG Jiahui1，YANG Liu1，ZOU Baoping2，REN Bin1，LI Linqing1. Effect of combined dip angle on dynamic mechanical properties of combined rock mass with hard and soft media. , 2024, 43(S1): 3342-3353.
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2024, Vol. 43 
