摘要
分析了爆破动应力在岩质边坡中的分布规律,推导出了爆破动应力与质点振速及岩体物理力学参数间关系的计算表达式。分析讨论了由爆破产生的附加动应力与岩质边坡中的应力场及岩体介质中的裂纹损伤场相互耦合作用机理,并推导出了裂纹初裂强度表达式。从断裂力学及损伤力学的理论出发,建立了节理裂隙岩体的等效柔度张量以及在爆破动应力作用下裂隙岩体的附加柔度张量。从所建立的柔度张量关系式中可知,当有爆破动应力存在时,增大了岩体的柔度张量,削弱了岩体的强度。
The distribution of vibratory stress in rock slope is analyzed,and the formula of calculating vibratory stress is given.The mechanism of coupling action between vibratory stress and slope stress fields and cracks is discussed,and the damage propagation criterion of joints and cracks is put forward.Based on the theories of fracture and damage mechanics,the equivalent flexibility tensor of the jointed rock masses considering the vibratory stress is deduced.The results show that the flexibility tensor of the rock mass becomes larger and its strength becomes lower because of the blasting vibratory stress.
出处
《工程爆破》
2004年第3期1-4,共4页
Engineering Blasting
关键词
爆破动应力
岩质边坡
损伤破坏机理
柔度张量
Blasting vibratory stress
Rock slope
Damage mechanism
Flexibility tensor
