Dynamic Response Mechanism of Uniaxial Transient Unloading in Jointed Rock Mass
This study aims to examine the mechanical responses and deformation damage mechanisms of deep jointed rock masses during transient unloading.We investigated the mechanical behavior and dynamic responses of these rock masses during transient unloading through theoretical analyses,laboratory experiments,numerical simulations,and other methods.Our research identifies several key factors influencing the dynamic response to transient unloa-ding in jointed rock formations.We develop a numerical model that describes in-situ field conditions closely.Initial findings reveal that in the first stage of uniaxial transient unloading,the rock mass experiences no tensile stress.However,in the subsequent second stage,the reflection of tensile stress waves transforms all kinetic energy into e-lastic potential,creating tensile stresses within the rock mass.Additionally,the unloading process generates transre-flectance at rock joints,leading to an inverse relationship between joint opening and stiffness in the presence of joints.In the second stage of uniaxial transient unloading,significant joint opening occurs,causing a sudden dis-placement in the rock mass as the reflected tensile stress wave reaches the joint.This research enhances our under-standing of the mechanical behavior of rock masses under uniaxial transient unloading,providing valuable insights for addressing transient unloading challenges in deep rock mass excavations.
deep rock massjointed rock masstransient unloadingdamage mechanicsnumerical analysis
万方数据
维普
