节理峰值剪切强度公式修正研究

Research on correction of joint peak shear strength criterion

节理峰值剪切强度受节理表面形貌的直接影响。为了进一步研究节理形貌对于峰值剪切强度的作用机制,对已有公式进行总结,并在此基础上建立新的公式。根据已有文献的57组三维形貌直剪试验数据,将新公式对峰值剪切强度的预测值与已有文献公式的预测值进行对比。结果表明,新公式的平均相对误差为11.6%,已有文献公式的平均相对误差分别为13.0%、19.3%、14.9%,新公式的预测精确度更高。

The joint peak shear strength is directly affected by the joint surface morphology.In order to study the relationship between joint morphology and peak shear strength,the existing criteria are summarized and optimized into a new criterion.Based on 57 sets of three-dimensional morphology direct shear test results collected from existed research,the predicted results of the new criterion and the existing criteria are compared.Results show that the average relative error of the new criterion is 11.6%,and the average relative errors of the existing criterions are 13.0%,19.3%and 14.9%,respectively.The new criterion has higher prediction accuracy.