中线法堆坝尾矿料的动力特性实验研究  

Dynamic characteristics of tailings material in centerline tailings dam

作　　者：谭钦文[1] 李军林 徐涛 

机构地区：[1]西南科技大学环境及资源科学学院,四川绵阳621010 [2]重庆市统景职业中学,重庆401142 [3]重庆市奉节水利局,重庆401100

出　　处：《自然灾害学报》2010年第4期60-65,共6页Journal of Natural Disasters

基　　金：国家自然科学基金(50374084);西南科技大学博士基金(08zx7119)

摘　　要：以云南迪庆羊拉铜矿的尾矿料为研究对象,通过大量动力三轴试验,研究了中线法堆坝工艺所要求的不同粗粒含量尾矿砂的动力液化特性。结果表明,粗粒含量对尾矿砂的动力特性具有重要影响,粗粒含量变化与尾矿料动应变和动孔压变化特性之间存在紧密的相关性,随着粗粒含量的增加,尾矿砂动强度总体上呈增大趋势;动孔压的增长特性也具有类似规律,但三者在动应变达到5%时,其值均远小于围压。动应力对动应变影响显著,应力幅值越大,达到破坏标准的振次越少;动强度则随着固结压力增加而增大;而固结比Kc对动强度的影响不是单一的增大或减小,Kc=1.5时,其动强度比Kc=1.0,2.0的都大。试验同时表明,粒径组成粗细兼顾,级配良好的尾矿砂通常比粒径单一的粗尾砂具更好的抗液化性能,在通过提高粗粒含量来增大尾矿砂抗震性能时,还应考虑颗粒级配特性的影响。To investigate the coarse content effect on the dynamic properties of tailings, dynamic triaxial tests were conducted on three kinds of tailing samples simulating the compositions of centerline construction method. The results show that the coarse content has strong effect on the axial strain, pore water pressure and liquefaction resistance; under the same seismic condition, the earthquake resistance become higher with the coarse content increase. At the same time , the pore water pressure has a similar law , but when the dynamic strain reaches to the 5% , the values of the three kinds of tailings are all lower than the confining pressure. The dynamic stress level has strong effect on dynamic axial strain , the higher the dynamic stress level , the less the cracking vibration times, and the dynamic strength of railings increases with the consolidation pressure . But the dynamic strength does not simply increase or decrease with consolidated stress ratio, when the consolidated stress ratio is equal to 1.5 , the dynamic stress is higher than that for the consolidated stress ratio 1.0 or 2.0. The results still show that the tailing which is composed of different grain - size particles has a higher liquefaction resistance than that composed of coarse grain simply. So, in order to enhance the liquefaction resistance by improving the coarse content, the composing ratio character of the grain must be taken into account too.

关 键 词：尾矿砂 动力特性 孔隙水压力 尾矿坝 抗液化强度 

分 类 号：X75[环境科学与工程—环境工程]