摘要
在霍普金森试验系统上进行了花岗岩动静组合加载试验,获得了花岗岩在动静组合加载下的力学性能。试验结果表明:当动载不变,改变静载大小,在弹性范围内,花岗岩强度随着静载增大而增大;当静载超过弹性极限时,花岗岩强度迅速降低;在其破坏过程中对冲击能量的吸收随静载增大而减小;变形模量呈现明显的两段特征。当静载不变,改变动载大小,花岗岩的强度随动载增大而增大;变形模量先随动载增大而增大,而后又突然变小,并不出现两段特征;在其破坏过程中对冲击能量的吸收随动载应变率的增大而逐渐增大。所得结果为岩爆、深部破岩等研究提供实验依据。
In view of current lack of deep rock mass bearing mode, the experiments of granite under coupled static-dynamic load are carried out on the SHPB system and the mechanical properties of granite failure are obtained. The experimental results show that: when dynamic load is fixed, the rock strength increases with the increasing of axial static load in the elastic range, when the static load exceeds elastic limit, the granite strength decreases rapidly; and the absorbing energy of granite decreases gradually with the increasing of the static load during granite failure; deformation modulus presents obvious two-stage characteristic. When axial static load is fixed, the rock strength increases with the increasing of dynamic load; deformation modulus first increases, then decreases suddenly; and absorbing energy of granite increases with the increasing of dynamic strain rate during granite failure.
出处
《应用力学学报》
CAS
CSCD
北大核心
2010年第3期630-634,共5页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(10472134)
