Effect of fine-grained dipping interlayers on mechanical behavior of tailings using discrete element method

被引：28

作者：

Chen, Qinglin ^{[1
]}

Zhang, Chao ^{[2
]}

Yang, Chunhe ^{[1
,2
]}

Ma, Changkun ^{[2
]}

Pan, Zhenkai ^{[2
]}

机构：

[1] Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Coll Resources & Environm Sci, Chongqing 400044, Peoples R China

[2] Chinese Acad Sci, State Key Lab Geomech & Geotech Engn, Inst Rock & Soil Mech, Wuhan 430071, Hubei, Peoples R China

来源：

ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS | 2019年 / 104卷

基金：

中国国家自然科学基金;

关键词：

Fine-grained interlayer; Deformation mode; Micro-mechanism; DEM; Contact fabric; FLEXIBLE MEMBRANE; CEMENTED SAND; ASSEMBLIES; ANISOTROPY; BOUNDARY; STRENGTH; STRESS; MODEL; SCALE; STATE;

D O I：

10.1016/j.enganabound.2019.03.029

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Due to the presence of fine-grained interlayers (frequently called lenticles), the stability of tailings dams can deteriorate. In this study, a two-dimensional numerical model with flexible boundary was constructed, and biaxial tests were carried out for samples with interlayers at different dip angles. The influence of the interlayer inclination on the mechanical properties of tailings was analyzed. The simulation results revealed that the shear strength of tailings with interlayers decreases with the increase in the interlayer dip angle. Obvious anisotropy of shear strengths was observed due to the presence of interlayers. All the deformations of the samples with interlayers were well captured in the DEM simulations. Bulging deformations were found in the samples with interlayers at dip angles of 0, 15 and 30. Shear slip along the fine interlayer plane was generated in the samples with inter layers with dip angles of 45 and 60. The principal orientation of the contact unit normal and the normal contact force aligns with the loading direction for the samples with interlayer at small dip angle (i.e., 0). However, for the sample with interlayer at large dip angle (i.e., 60), the principal orientation trends to the direction normal to the interlayer.

引用

页码：288 / 299

页数：12

共 49 条

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