长江科学院院报2024，Vol.41Issue(4)：95-103,9.DOI:10.11988/ckyyb.20230793
节理岩体单轴瞬态卸荷动态响应机理
Dynamic Response Mechanism of Uniaxial Transient Unloading in Jointed Rock Mass
摘要
Abstract
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.关键词
深部岩体/节理岩体/瞬态卸荷/损伤力学/数值分析Key words
deep rock mass/jointed rock mass/transient unloading/damage mechanics/numerical analysis分类
建筑与水利引用本文复制引用
李新平,王良军,宋凯文,王梓,黄俊红,刘婷婷..节理岩体单轴瞬态卸荷动态响应机理[J].长江科学院院报,2024,41(4):95-103,9.基金项目
国家自然科学基金项目(52109165) （52109165）
