Study on Static and Dynamic Strength Characteristics of Tailings Silty Sand and Its Engineering Application
Through high pressure oedometer-undrained triaxial tests and dynamic triaxial tests, researches were conducted on the static and dynamic strength characteristics of the tailings silty sand of No. 4 tailings reservoir in De-xing copper mine. The Mohrstress circles of the tailings silty sand under all the testing confining pressure show that the single line failure envelope cant represent the strength characteristics absolutely, the double line failure envelope can express the strength properties when confining pressures are less than 1400 kPa, and the parabolic failure envelope can reflect the strength characteristics well under all the testing confining pressures. The grading curve of the tailings silty sand indicates that the grain composition is relatively homogeneous. Thus, the tailings silty sand is susceptible to liquefy under the dynamic loading. Dynamic triaxial tests of the tailings silty sand show that the tailings silty sand in deep areas has more liquefaction resistance strengths than in shallow. The possible explanation is that the structure of the deep tailings silty sand is more stable than the shallow one. The tests also reveal that the liquefaction resistance increases with the dry density when it is in the range of 1.51 to 1.61. The results can be used to guide the construction and ensure the safety of No. 4 tailings dam or other high tailings dams.
high tailings dam tailings silty sand high-pressure triaxial test dynamic triaxial test liquefaction safety factor
LIU Hai-ming YANG Chun-he ZHANG Chao MAO Hai-jun
State Key Laboratory of Ceomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
国际会议
The First International Symposium on Mine Safety Science and Engineering (首届矿山安全科学与工程学术会议)
北京
英文
27-38
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）