CAJ | 학술논문

借助理论模型和试验测试结果分析初始应力对岩石弹性波速的影响,运用数值模拟手段对比研究爆炸扰动作用下不同初始应力时的应力波形状,包括质点应力、位移和速度,得到初始应力对应力波传播影响的一般规律.建立构造块体在爆炸扰动下的运动模型,通过对模型的计算和分析,研究不同初始应力下单个块体的相对位移.研究结果表明:(1) 在低初始应力下,岩石中的弹性波速随压力增大而迅速增大,增大的梯度在低应力下较高,在高应力下趋于一常数值;(2) 当初始应力增大时,相同距离处的峰值径向应力和峰值位移会降低,而且衰减较快,波形变窄;(3) 块体间的相对位移与初始应力的大小成反比.
차조이론모형화시험측시결과분석초시응력대암석탄성파속적영향,운용수치모의수단대비연구폭작우동작용하불동초시응력시적응력파형상,포괄질점응력、위이화속도,득도초시응력대응력파전파영향적일반규률.건립구조괴체재폭작우동하적운동모형,통과대모형적계산화분석,연구불동초시응력하단개괴체적상대위이.연구결과표명:(1) 재저초시응력하,암석중적탄성파속수압력증대이신속증대,증대적제도재저응력하교고,재고응력하추우일상수치;(2) 당초시응력증대시,상동거리처적봉치경향응력화봉치위이회강저,이차쇠감교쾌,파형변착;(3) 괴체간적상대위이여초시응력적대소성반비.
The effect of initial stress on velocity of wave propagation in rock is analyzed by theoretic models and test results. The shapes of stress wave including particle stress,displacement and velocity with different initial stresses under the condition of explosion disturbances are studied by method of numerical simulation,and the basic law of initial stress effect on wave propagation is obtained. The movement model of structural block under the effect of explosion is built. The relative displacement of single block with different initial stresses is studied through increasing calculating and analyzing the numerical model. The results show that:(1) the velocity of wave propagation in rock increases rapidly under low initial stress,and tends to be constant under high initial stress;(2) the radial stress and displacement at the same distance will decrease with increasing of initial stress rapidly,and the wave shape will become narrow;and (3) the relative displacement of single block has inverse ratio to the value of initial stress.