煤层开采过程中，开采工作面围岩一定范围内的岩体会产生卸荷裂缝或新裂隙，其中有一部分裂缝和裂隙存在张开的经历。由于张开的裂隙和缝隙内没有力的传递介质，在这些裂缝、裂隙附近区域的应力会从因重力引起的应力大值降低到一个很小的值，但不一定会达到应力为0值。裂缝、裂隙附近区域的应力由于之后的应力重分布可以发生调整而振荡，裂缝、裂隙相应地可以闭合，甚至可以承受很大的剪应力。基于一部分采动张开裂隙附近区域的应力大值曾经历过大幅度卸载到一个很小值这一动态过程，提出了一种识别采动裂隙带发育的动态应力追踪方法。以宁夏石嘴山矿区三号煤层为工程背景，利用离散元UDEC软件包计算确定煤层开采过程中覆岩内部不同开采阶段的应力分布。借助于后处理软件TechPlot，利用提出的动态应力追踪方法，识别该矿采动裂隙带的范围和高度；研究结果表明，所提出的动态应力追逐方法具有可行性和很好的适用性。

Disturbance cracks or fractures are generated in the surrounding rock mass of mining face in the process of coal mining. Among these cracks or fractures, some experience the opening process. Due to the fact that there is no substance in these opened cracks or fractures to transmit force, the stresses in the zone near to these cracks or fractures will decrease to a small value from their initial gravity-induced large stress values but not necessarily reach 0. After these cracks or fractures are generated, the stresses in the zone near to them would adjust and cause vibration due to stress redistribution. Accordingly, these cracks or fractures would be closed again, they could even bear great shear stresses. Based on the described phenomenon that the stress in the zone near to disturbance cracks or fractures have experienced the process of stress unloading from large to small values, a method referred to as “dynamic stress tracing method” is developed to identify the range and height of disturbance factures/cracks zone. The No.3 coal seam mining of Shizuishan in Ningxia province is given as a case. The discrete element software package UDEC is applied to determine the stress distribution during the process of coal mining. Based on the proposed dynamic stress tracing method, the range and height of the disturbance fractures/cracks zones are estimated using the post-processing package TecPlot. It is indicated that the proposed dynamic stress tracing method for identifying the height of coal mining disturbance fractured/cracks zone is feasible, and owns good suitability.