磷石膏的动力学特性试验研究  

Experimental study on the dynamic characteristics of phosphogypsum

作　　者：路停 魏作安[1,2] 王文松[1,2] 杨永浩[1,2] 曹冠森 庄孙宁 LU Ting;WEI Zuoan;WANG Wensong;YANG Yonghao;CAO Guansen;ZHUANG Sunning(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;School of Resources and Safety Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学,煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]重庆大学资源与安全学院,重庆400044

出　　处：《振动与冲击》2020年第14期264-271,共8页Journal of Vibration and Shock

基　　金：国家重点研发计划项目(2017YFC0804609);国家自然科学基金资助项目(51804051,51804178);重庆市博士后科研项目特别资助(XmT2018017)。

摘　　要：利用带有弯曲元模块的GDS振动三轴试验仪,对磷石膏的动力学特性进行了系统研究。获得了磷石膏的动强度、动剪切模量Gd、阻尼比λ和动孔隙水压力μd等动力参数及其变化规律。结果表明:磷石膏的动强度曲线呈幂函数形式,不同围压下的动强度曲线归一性较差;初始动剪切模量Gd0与有效固结围压σ′0呈幂函数关系;采用Davidenkov模型对动剪切模量比Gd/Gd0进行拟合,不同围压下磷石膏的动剪切模量比归一性较好;随着干密度及围压的增加,磷石膏的孔压发展曲线由"双S"型向"单S"型变化;以Seed孔压模型为基础,建立了磷石膏的动孔压模型。The GDS dynamic triaxle test system with a bending element module was used to study systematically the dynamic characteristics of phosphogypsum. The dynamic parameters of phosphogypsum and their variation were investigated, such as the dynamic strength, dynamic shear modulus Gd, damping ratio λ and dynamic pore water pressure μd. The results show that the dynamic strength curve of phosphogypsum is in the form of a power function, and it is found the normalization of the dynamic strength curves under different confining pressure is made rather poorly. The initial dynamic shear modulus Gd0 is in a power function relationship with the effective consolidation confining pressure σ′0.The Davidenkov model was used to fit the dynamic shear modulus ratio Gd/Gd0, and the normalization of the dynamic shear modulus ratio of phosphogypsum under different confining pressure is found to be better. With the increase of dry density and confining pressure, the pore pressure development curve of phosphogypsum varies its form "double S" to "single S". Based on the Seed model, a pore pressure model suitable for the development of dynamic pore pressure of phosphogypsum was established.

关 键 词：磷石膏 土动力学 动强度 动剪切模量 阻尼比 动孔隙水压力 

分 类 号：TU435[建筑科学—岩土工程]