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通过理论分析和室内直剪试验,对充填水泥浆岩石节理的峰值剪切强度模型进行研究。首先,建立考虑三维形貌特征的充填水泥浆岩石节理峰值剪切强度模型;其次,采用建立的强度模型计算充填水泥浆节理的峰值剪切强度并与直剪试验结果进行对比;最后,对模型计算值和试验值之间的误差进行分析。研究结果表明,建立的充填水泥浆节理峰值剪切强度模型描述了三维形貌、充填度、节理岩壁与水泥结石强度比对充填节理峰值剪切强度的影响;模型计算的充填水泥浆节理峰值剪切强度与试验结果吻合较好,验证了模型的合理性;模型预测的峰值剪切强度与试验值之间存在一定误差,造成误差的主要原因包括模型本身缺陷和试件制备导致的节理黏结缺陷。充填水泥浆岩石节理峰值剪切强度模型的建立具有一定的理论意义,为进一步建立充填水泥浆节理本构理论奠定了基础。
Through theoretical analysis and indoor direct shear test, the peak shear strength model of rock joints filled with cement slurry is studied. Firstly, the model of peak shear strength of filled rock cement with three-dimensional topography is established. Secondly, the peak shear strength of filled grouted joints is calculated by using the established strength model and compared with the results of direct shear test. Finally, The error between the calculated value and the experimental value is analyzed. The results show that the model of peak shear strength of filled grouted joints describes the effect of three-dimensional morphology, filling degree, strength ratio of jointed rock wall and cement stone on the peak shear strength of filling joint. The calculated peak value of grouted joints The shear strength is in good agreement with the experimental results, which proves the rationality of the model. There is a certain error between the predicted peak shear strength and the experimental value. The main causes of the error include the defect of the model itself and the joint bonding caused by the specimen preparation defect. The establishment of peak shear strength model of filled cement rock joints has some theoretical significance, which lays the foundation for further establishment of the constitutive theory of filled cement joints.