不同固结条件下尾矿粉质黏土动力变形特性分析  

Analysis of dynamic deformation characteristics of tailings silty clay under different consolidation conditions

作　　者：蔡国军[1,2] 李林[1,2] 卫俊仁 蒲洪 孙文鹏 杨森林 CAI Guojun;LI Lin;WEI Junren;PU Hong;SUN Wenpeng;YANG Senlin(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Chengdu University of Technology),Chengdu 610059,China;National Geological Engineering Experimental Teaching Demonstration Center of Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),四川成都610059 [2]成都理工大学地质工程国家级实验教学示范中心,四川成都610059

出　　处：《中国测试》2024年第1期39-45,共7页China Measurement & Test

基　　金：国家重点实验室自主课题(SKLGP2019Z017)。

摘　　要：利用GDS振动三轴试验系统,针对四川省某尾矿库的尾矿粉质黏土料,基于不同固结条件开展振动三轴试验,研究尾矿粉质黏土在分级循环荷载下的变形特性,基于不同固结条件对尾矿粉质黏土各动力变形特性参数的变化情况进行对比分析。结果表明:当固结围压σ_(3)和固结比Kc不断变大时,尾矿粉质黏土的各动力变形参数呈现出明显不同变化趋势,阻尼比λ会持续变小,动弹性模量E_(d)与动剪切模量G_(d)不断增大;在动应变ε_(d)不断增大的过程中,阻尼比λ会相应升高,但动弹性模量E_(d)与动剪切模量G_(d)却显著下降,动弹性模量比E_(d)/E_(dmax)逐渐减小,表明动弹性模量逐渐衰减,且衰减过程呈三段式;固结压力σ_(3)和固结比Kc的增大可以减缓动弹性模量E_(d)的衰减。采用沈珠江动本构模型对试验结果进行拟合,获得相关模型参数。Using the GDS vibration triaxial test system,for the tailings silty clay in a tailings pond in Sichuan Province,a vibration triaxial test was carried out based on different consolidation conditions to study the deformation characteristics of the tailings silty clay under graded cyclic loading.The changes of dynamic deformation characteristic parameters of tailings silty clay under different consolidation conditions were compared and analyzed.The results show that when the consolidation confining pressureσ_(3)and consolidation ratio Kc increase continuously,the dynamic deformation parameters of tailings silty clay show obvious different trends,the damping ratioλwill continue to decrease,and the dynamic elastic modulus E_(d)and the dynamic shear modulus G_(d)keeps increasing;when the dynamic strainε_(d)increases,the damping ratioλwill increase accordingly,but the dynamic elastic modulus E_(d)and the dynamic shear modulus G_(d)decrease significantly.The ratio E_(d)/E_(dmax)gradually decreases,indicating that the dynamic elastic modulus gradually decays,and the decay process is three-stage;the increase of consolidation pressureσ_(3)and consolidation ratio Kc can slow down the decay of dynamic elastic modulus E_(d).The Shen Zhujiang dynamic constitutive model was used to fit the test results,and the relevant model parameters were obtained.

关 键 词：尾粉黏土 振动三轴试验 动弹性模量 阻尼比 动剪切模量 沈珠江动本构模型 

分 类 号：TU47[建筑科学—结构工程]