充填水泥浆岩石节理峰值剪切强度模型  

A PEAK SHEAR STRENGTH MODEL FOR CEMENT FILLED ROCK JOINTS

作　　者：孙辅庭[1] 佘成学[1] 万利台 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《岩石力学与工程学报》2014年第12期2481-2489,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51079108);中央高校基本科研业务费专项资金资助项目(2012206020208)

摘　　要：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。A peak shear strength model for cement filled rock joints was proposed based on the results of theoretical analysis and direct shear tests. Firstly,three-dimensional morphology parameters of the cement filled rock joints was obtained. Then,the peak shear strength of the cement filled rock joints was calculated using the proposed model and comparisons were made between the calculated and measured results. Finally,the errors between the predicted and the measured peak shear strengths were analyzed. The predicted results was close to the measured ones. The model was found to capture well the influence of the three-dimensional morphology characteristics,the percentage of cement filling and the strength ratio of joint rock wall to cement stone. Errors were mainly caused by the inaccuracy of the proposed model and the defect of bond between joint and cement stone.

关 键 词：岩石力学 充填模型 峰值剪切强度 灌浆节理 直剪试验 

分 类 号：TU45[建筑科学—岩土工程]