Anisotropic shear strength characteristics of a tailings sand

被引：24

作者：

Chen, Rui ^{[1
]}

Lei, Weidong ^{[1
]}

Li, Zaihong ^{[2
]}

机构：

[1] Harbin Inst Technol, Shenzhen Grad Sch, Shenzhen Key Lab Urban & Civil Engn Disaster Prev, Shenzhen 518055, Guangdong, Peoples R China

[2] China United Engn Corp, Hangzhou 310022, Zhejiang, Peoples R China

来源：

ENVIRONMENTAL EARTH SCIENCES | 2014年 / 71卷 / 12期

基金：

中国国家自然科学基金;

关键词：

Soils; Anisotropy; Shear strength; Dilatancy; Tailings sand; Direct shear test; BEARING CAPACITY; BEHAVIOR; TESTS; WATER;

D O I：

10.1007/s12665-013-2918-6

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The deposition process of tailings in a tailings dam may lead to the anisotropy of mechanical properties of tailings. To investigate the anisotropic shear strength characteristics of a tailings sand, samples deposited under gravity were sheared in a modified direct shear apparatus along different orientations of the shear planes relative to the bedding plane. The experimental results reveal that the anisotropy has a substantial effect on the peak shear strength of the tailings sand, leading to a variation in peak friction angle of 10A degrees. It is found that the effect of anisotropy on the peak shear strength of the tailings sand is mainly attributed to the effect of anisotropy on soil dilatancy. On the other hand, the effect of anisotropy on the residual friction angle of the tailing sand is relatively smaller, likely due to the partial erasure of anisotropy at large shear deformation. The degree of anisotropy is reduced by an increase in normal stress. To achieve more accurate stability analysis of tailings dams, it is suggested to take into account the shear strength anisotropy of tailings soils.

引用

页码：5165 / 5172

页数：8

共 25 条

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