充填模袋体界面剪切特性  

Interfacial shear characteristics of tailings filling geotextile tubes

作　　者：刘小文[1] 吴泽铭 郭飞阳 万忠豪 LIU Xiaowen;WU Zeming;GUO Feiyang;WAN Zhonghao(School of Infrastructure Engineering Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学工程建设学院,江西南昌330031

出　　处：《南昌大学学报（理科版）》2024年第4期324-329,共6页Journal of Nanchang University(Natural Science)

基　　金：国家自然科学基金资助项目(52169026、52369024)。

摘　　要：模袋筑坝安全稳定性与模袋体界面强度密切相关。基于ABAQUS有限元析软件,建立模袋体界面剪切模型进行剪切试验模拟,分析了模袋体界面剪切过程中的剪应力、剪位移变化规律以及不同尺寸对界面剪切强度影响,并将数值模拟结果与室内剪切试验结果进行了对比验证。结果表明:模袋体界面剪切是一个渐进屈服破坏的过程且剪切面中间部位的塑性变形最大;数值模拟能够较好的反映出模袋体的剪切变形规律;大尺寸模袋体界面抗剪强度相较于小尺寸模袋体强度有所增加,且主要体现在界面摩擦角的增大;剪切过程中大尺寸模袋体界面剪应力存在明显峰值并出现应变软化现象。结论对工程中尾砂充填模袋筑坝具有一定指导意义。The safety and stability of the mold bag dam are closely related to the interface strength of the mold bag.Based on ABAQUS finite element analysis software,the interface model of the geotextile tubes was established for shear test simulation.The shear stress,shear displacement variation law and the influence of different sizes on the interface shear strength during the shear process of the geotextile tubes interface were analyzed.The numerical simulation results were compared with the indoor shear test results.The results showed that the interfacial shear of the geotextile tubes was a progressive yield failure process and the plastic deformation in the middle of the shear plane was the largest.Numerical simulation can better reflect the shear deformation law of the geotextile tubes.The shear strength of the interface of the large-size geotextile tubes was higher than that of the small-size mold bag,and it was mainly reflected in the increase of the interface friction angle.During the shearing process,the interface shear stress of the large-size geotextile tubes has an obvious peak value and the strain softening phenomenon occurs.The conclusion has certain guiding significance for the dam construction of tailings filling the geotextile tubes in the project.

关 键 词：有限元 土工模袋 界面剪切 模袋尺寸 

分 类 号：TD926.4[矿业工程—选矿]