摘要
本文通过对应力波加载岩样的理论分析和实验研究,指出:岩石吸能存在有一临界入射应力值,当入射应力小于该值时,即使应力波延续时间最长,岩石也难于破碎;当入射应力大得足以在单次冲击下破碎岩石时,每一入射应力下均存在有一与之相对应的临界应力波延续时间;应力幅值为岩石破碎强度的1.33～2倍时,对应的岩石吸能最大,但最大的岩石吸能也只有入射能的40％～50％。
In this paper, the energy absorption of rocks under dynamic loads varying with its duration and its amplitude is studied by means of SHPB method. Through experimentation and theoretical analysis, we have obtained the following conclu- sions: First, there exists a critical stress value of rocks for every kind of rocks, i.e. for one kind of rock, if the incident wave stress amplitude is smaller than its critical value, its energy absorption is approximately zero for arbitary duration of the incident wave. Second when the incident wave stress amplitude is large enough to fracture rocks, there exists a corresponding critical duration of the incident wave. The third one is that the maximan limit of energy absorption of rocks is about 40%～50% the incident wave energy when the amplitude value of the incident wave is equal to 1. 33～2 times the fractured strength of rocks.
关键词
应力波
延续时间
破岩
效果
stress wave
energy absorption
rock mechanics
impact fracture
impact test
