水泥-纤维改良昆明地区红黏土动力特性试验  

Experiment on Dynamic Properties of Cement-fiber Improve Red Clay in Kunming Area

作　　者：龙宁波 屈俊童 杨擎宇 张翔 刘关栋 张超 LONG Ning-bo;QU Jun-tong;YANG Qing-yu;ZHANG Xiang;LIU Guan-dong;ZHANG Chao(School of Architecture and Planning,Yunnan University,Kunming 650504,China;Yunnan Electric Power Design Institute Co.,Ltd.,Kunming 650051,China)

机构地区：[1]云南大学建筑与规划学院,昆明650504 [2]云南省电力设计院有限公司,昆明650051

出　　处：《科学技术与工程》2023年第15期6560-6572,共13页Science Technology and Engineering

基　　金：云南省科技厅科技计划(2019FD125);云南大学院级科研立项资助项目(YJ20210019)。

摘　　要：为了研究水泥-玄武岩纤维对于昆明地区红黏土的动力特性的改良效果,在已有的室内试验基础上,分别对未改良红黏土和12%掺量的水泥、0.5%玄武岩纤维的改良红黏土,在一定围压和加载频率条件下进行室内动三轴试验,着重分析了围压、频率和干湿循环对动力学变形性质与动力学强度性质的影响。试验结果表明:改良前后的红黏土动力特性有所不同,改良前动应力幅值与动应变幅值符合双曲线模型,而改良后的红黏土动变形整体呈现出线弹性,符合线性回归模型与Logistic回归模型。改良后红黏土的最大动弹性模量明显增加、阻尼比会明显下降、动力破坏形式发生改变、动强度明显增大,并分析了围压、频率和干湿循环次数对改良前后红黏土的动力特性的影响,拟合并得出相关参数。In order to study the improvement effect of cement-basalt fiber on the dynamic properties of red clay in Kunming area,based on the existing laboratory experiments,the unmodified red clay and the modified red clay with 12%cement and 0.5%basalt fiber were respectively tested.Indoor dynamic triaxial tests were carried out under certain confining pressure and loading frequency,and the effects of confining pressure,frequency and wet-dry cycle on dynamic deformation properties and dynamic strength properties were emphatically analyzed.The test results show that the dynamic characteristics of the red clay before and after the improvement are different.The dynamic stress amplitude and dynamic strain amplitude before the improvement conform to the hyperbolic model,while the dynamic deformation of the improved red clay shows linear elasticity as a whole,which is in line with the linear regression model and the Logistic regression model.The maximum dynamic elastic modulus of the improved red clay increases significantly,the damping ratio decreases significantly,the dynamic failure mode changes,and the dynamic strength increases significantly.The influence of confining pressure,frequency,and dry wet cycles on the dynamic characteristics of the improved red clay was analyzed,and the relevant parameters were proposed.

关 键 词：红黏土 水泥-玄武岩纤维 动力特性 固化剂 

分 类 号：TU411.8[建筑科学—岩土工程]