深部煤岩动力扰动响应特征及数值分析

Characteristics of dynamic disturbance response in deep coal and rock and its numerical analysis

理论分析了动力扰动引起的应力波在煤岩空间内的传播规律;探讨了动力扰动引起的煤岩附加能量场特征规律;采用LS-DYNA软件进行数值模拟,分析了煤岩系统对扰动频率与幅度的响应特征及能量变化规律.结果表明:扰动幅度和频率对深部围岩稳定性具有较大影响,由动力扰动引起的附加能流密度与扰动幅度的平方成正比,扰动促使围岩应力集中区前移;最大反射能流密度峰值位置离自由面距离与扰动频率符合幂函数关系,扰动频率的增大加快了能量流动的速度,降低了单位时间流入煤岩单元的能量,表现为"高频低能,低频高能",扰动伴随着能量流的不均衡发展并相互促进.

The stress wave propagation law caused by dynamic disturbance is analyzed in coal rock.Additional energy domain is also explored.The disturbance frequency and amplitude response characteristics and energy distribution law of coal or rock system is studied.The results show that the disturbance amplitude and frequency greatly affect the stability indeep surrounding rock.Additional energy flow density is proportional to the square of dynamic disturbance amplitude,and the disturbance also caused surrounding rock stress abutement zone forward.Distance from the maximum reflection energy flow density peak position to the free surface and perturbation frequency conforms to a power function relation.The increase of disturbance frequency accelerates the energy flow rate and reduces the inflow of energy into coal rock in unit time.This process can be expressed as ＂higher frequency with lower energy and lower frequency with higher energy＂.Disturbance is coupled with unbalanced development of energy flow and which promotes each other.