双向振动下高聚物胶凝戈壁土的动力特性试验研究  

Study on the dynamic characteristics of high polymer cementitious Gobi soil under bidirectional vibration

作　　者：杨海华[1,2] 夏宇 宋优建 何建新 杨武[1,2] YANG Haihua;XIA Yu;SONG Youjian;HE Jianxin;YANG Wu(College of Hydraulic and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China;Xinjiang Key Laboratory of Water Conservancy Engineering Safety and Water Disaster Prevention,Urumqi 830052,China)

机构地区：[1]新疆农业大学水利与土木工程学院,乌鲁木齐830052 [2]新疆水利工程安全与水灾害防治重点实验室,新疆乌鲁木齐830052

出　　处：《世界地震工程》2024年第4期151-163,共13页World Earthquake Engineering

基　　金：新疆水利工程安全与水灾害防治重点实验室(ZDSYS-JS-2022-02)。

摘　　要：地震灾害是我国岩土工程中经常遇到的问题之一,为研究戈壁土受地震作用时的动力特性变化规律,采用大型动静三轴试验系模拟土体在受到地震纵横波共同作用时的激振应力,研究掺入一定量的高聚物胶凝材料后的高聚物戈壁土受双向振动作用下各因素对戈壁土动剪切模量、阻尼比及残余变形的影响。研究结果表明:双向振动下,动剪切模量随动剪切应变的增长逐渐减小,随径向动应力比增加,动剪切模量呈现出先增后减的趋势;围压和固结比与动剪切模量呈现出正相关;相位在0°~180°内增长时,双向振动作用下的试样动剪应力增大,动剪切模量随之增加,而阻尼比受各因素的影响较小。高聚物胶凝戈壁土的残余变形随高聚物质量比的增大而迅速减小;在相位差为180°时的动残余体应变和残余剪应变均增大。研究结果初步探明了高聚物胶凝戈壁土在双向振动下的动力变形特性,可为高聚物胶凝戈壁土的应用及工程抗震设计提供参考。Seismic disaster is one of the frequently encountered problems in geotechnical engineering in China,in order to study the change rule of dynamic properties of Gobi soil when subjected to seismic action,a large dynamic and static triaxial test system is used to simulate the excitation stress of the soil body when subjected to the joint action of longitudinal and transversal waves of earthquakes,and to study the influence of various factors on the dynamic shear modulus,damping ratio and residual deformation of the Gobi soil when subjected to bi-directional vibration of the Gobi soil after mixing a certain amount of polymer cementing material.The effect of two-way vibration on the dynamic shear modulus,damping ratio and residual deformation.The results show that:under bidirectional vibration,the dynamic shear modulus decreases gradually with the growth of dynamic shear strain,and with the increase of radial dynamic stress ratio,the dynamic shear modulus shows a tendency of increasing and then decreasing;the peripheral pressure and consolidation ratio are positively correlated with the dynamic shear modulus;when the phase grows within 0°~180°,the dynamic shear stress of the specimen under the action of bidirectional vibration increases,and the dynamic shear modulus increases,and the damping ratio is less affected by the various factors.Smaller.The residual deformation of polymer cemented Gobi soil decreases rapidly with the increase of polymer mass ratio;the dynamic residual body strain and residual shear strain increase at a phase difference of 180°.The preliminary results of the study show that the dynamic deformation characteristics of polymer cemented Gobi soil under bidirectional vibration can provide a reference basis for the application of polymer cemented Gobi soil and the seismic design of engineering.

关 键 词：高聚物胶凝戈壁土 双向振动 动力特性 动剪切模量 阻尼比 残余变形 

分 类 号：TU43[建筑科学—岩土工程]