渗透压下岩石翼形裂纹应力强度因子及断裂判据
发布时间：2019-04-16 11:18
【摘要】：为研究渗透压下岩石翼形裂纹面部分闭合情况下的破坏行为,建立多裂纹间相互作用下压剪翼形裂纹的力学模型,推导得到岩石翼形裂纹尖端应力强度因子表达式.分析不同起裂角条件下,应力强度因子随岩石翼裂纹长度的变化规律,并对参数进行敏感性分析.基于摩尔-库伦准则,推导考虑裂纹间相互作用的部分闭合型裂纹的断裂韧度表达式,得到岩石在压剪应力作用下Ⅰ,Ⅱ型裂纹的复合断裂判据.分析结果表明:裂纹间相互作用对应力强度因子的影响效果显著;应力强度因子在起裂角为65°左右时达到最大;应力强度因子对裂纹起裂角和翼形裂纹长度较敏感,对裂纹闭合度的敏感性较小.
[Abstract]:In order to study the failure behavior under partial closure of rock wing crack surface under osmotic pressure, a mechanical model of compression shear wing crack under multi-crack interaction is established, and the expression of stress intensity factor at the tip of rock wing crack is derived. The variation rule of stress intensity factor with crack length of rock wing under different crack initiation angles is analyzed, and the sensitivity of parameters is analyzed. Based on the Moore-Coulomb criterion, the expression of fracture toughness of partially closed crack considering the interaction between cracks is derived, and the composite fracture criterion of crack 鈪，
本文编号：2458730
[Abstract]:In order to study the failure behavior under partial closure of rock wing crack surface under osmotic pressure, a mechanical model of compression shear wing crack under multi-crack interaction is established, and the expression of stress intensity factor at the tip of rock wing crack is derived. The variation rule of stress intensity factor with crack length of rock wing under different crack initiation angles is analyzed, and the sensitivity of parameters is analyzed. Based on the Moore-Coulomb criterion, the expression of fracture toughness of partially closed crack considering the interaction between cracks is derived, and the composite fracture criterion of crack 鈪，
本文编号：2458730
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