›› 2013, Vol. 34 ›› Issue (5): 1340-1344.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Variation of internal friction angle of tailings with standard penetration number under influence of water content

LI Zhi-ping1, 2，PENG Zhen-bin1，XIAO Zun-qun3，ZHANG Yue-an2   

  1. 1. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China; 2. Changsha Design and Research Institute of Ministry of Chemical Industry, Changsha 410017, China; 3. School of Civil Engineering, Central South University, Changsha 410075, China
  • Received:2012-07-17 Online:2013-05-10 Published:2013-05-14

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Abstract: The tailings sample has characteristics of easily to be disturbed in the process of both transportation and storage. However, limited by human resources as well as project budget, or else factors, it is impossible to establish field laboratory for all upstream tailings dam during their engineering geological exploration, thereby leading to errors between the shear strength index and practical situation. For this reason, an extensive field testing is carried out in a lead-zinc mine tailings dam, the water content and standard penetration number can be easily obtained from field testing; and the internal friction angles of tailings as it changes through standard penetration number under the influence of the water content are studied. Considering the effect of overburden pressure, a amended expressions of standard penetration number is proposed. And using the standard penetration number，a estimation method about the internal friction angle of tailings is deduced; Finally, several examples are given to verify that except for the situation when the amended standard penetration number is N1 >8（5%< <20%），this method can estimate the internal friction angle of tailings sand effectively. The results show that, the method has a high application value in upstream tailings dams’ engineering geological exploration in the future.

Key words: upstream tailings dam, tailings, water content, internal friction angle, standard penetration number

CLC Number: 

  • TU 411
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