尾矿粉土液化后的大变形特性试验研究  

Experimental Study on Large Post-Liquefaction Deformation Behavior of Tailings Silt

作　　者：杜艳强[1] 杨春和[1,2] 张超[2] 巫尚蔚 

机构地区：[1]重庆大学资源及环境科学学院,重庆400044 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《东北大学学报（自然科学版）》2016年第8期1166-1171,共6页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金重点资助项目(51234004);国家自然科学基金资助项目(41272391)

摘　　要：利用GDS动三轴试验系统研究尾矿粉土液化后的变形特性.首先对饱和尾矿粉土进行振动使其液化,再施加静力荷载;分析了固结围压、相对密度、加载速率等因素对变形与孔隙水压力的影响,研究了饱和尾矿粉土液化后的流动变形与孔隙水消散的变化规律.结果表明：不排水试验条件下,固结围压、相对密度对尾矿粉土液化后的流动变形特性影响明显,而加载速率的影响较小;加载试验的最终孔压比一般介于0.7-0.9之间,相对密度对孔压消散过程的影响大于围压的影响.根据试验结果提出了描述尾矿粉土液化后变形特性的三参数模型,并进行了模型参数的拟合计算及模型验证和对比,结果表明该模型具有良好的适用性.The GDS dynamic triaxial testing system was used to study the reloading feature of liquefied tailings silt.First,the saturated tailings silt was liquefied by cyclic loadings,then,the static loadings were applied to the liquefied tailings silt.The deformation and pore water pressure of the liquefied tailings silt were experimentally studied,with confining pressure,relative density and loading rate considered.The results showthat,the confining pressure and relative density impact on the deformation of liquefied tailings silt obviously,while the loading rate has little effect,under undrainage condition.Pore water pressure ratio is usually between 0.7 - 0.9 at the end of the experiment.Relative density has greater impact on the pore water pressure than confining pressure.Based on the experimental data,a newthree-parameter constitutive model of liquefied tailings silt is presented and the model parameters are determined by fitting.It is validated that the model proposed has good applicability and forecast precision.

关 键 词：尾矿粉土 孔隙水压力 液化 变形 本构模型 

分 类 号：TD315[矿业工程—矿井建设]