论文部分内容阅读
根据Barton-Bandis节理峰值剪切强度准则,分析了节理峰值剪切位移与法向应力之间的变化关系,并以此为基础总结了Barton峰值剪切位移公式的不足。通过室内直剪试验验证了节理粗糙度与法向应力是影响结构面峰值剪切位移的两个主要因素。试验结果表明,峰值剪切位移与节理粗糙度成反变化关系,与法向应力成正变化关系。建立了考虑节理粗糙度与法向应力的节理峰值剪切位移计算新公式。克服了Barton经验公式只考虑节理粗糙度,而不考虑法向应力作用的局限。新公式能很好地拟合试验数据,表明其合理性。
According to the Barton-Bandis joint peak shear strength criterion, the relationship between the peak shear displacement and normal stress of the joint is analyzed. Based on this, the shortage of the Barton-peak shear displacement formula is summarized. Through the direct shear test in laboratory, it is verified that the joint roughness and the normal stress are the two main factors that affect the peak shear displacement of the structural plane. The experimental results show that the peak shear displacement is inversely related to the joint roughness and has a positive relationship with the normal stress. A new formula for calculating the peak shear displacement of joints is established considering the joint roughness and normal stress. It overcomes the Barton empirical formula to consider only the joint roughness, without considering the limitations of normal stress. The new formula can well fit the experimental data to show its rationality.