A Study of Three Intrinsic Problems of the Classic Discrete Element Method Using Flat-Joint Model

被引:250
作者
Wu, Shunchuan [1 ,2 ]
Xu, Xueliang [1 ,2 ]
机构
[1] Univ Sci & Technol Beijing, Sch Civil & Environm Engn, Beijing 100083, Peoples R China
[2] Univ Sci & Technol Beijing, Key Lab, Minist Efficient Min & Safety Met Mines, Beijing 100083, Peoples R China
关键词
Flat-joint model; UCS/TS ratio; Internal friction angle; Hoek-Brown strength parameter m(i); Post-peak behavior; Number of tensile and shear cracks; BONDED-PARTICLE MODEL; NUMERICAL-SIMULATION; MECHANICAL-BEHAVIOR; SYNTHETIC ROCK; FRACTURE; BRITTLENESS; CALIBRATION; SPECIMENS; STRENGTH;
D O I
10.1007/s00603-015-0890-z
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Discrete element methods have been proven to offer a new avenue for obtaining the mechanics of geo-materials. The standard bonded-particle model (BPM), a classic discrete element method, has been applied to a wide range of problems related to rock and soil. However, three intrinsic problems are associated with using the standard BPM: (1) an unrealistically low unconfined compressive strength to tensile strength (UCS/TS) ratio, (2) an excessively low internal friction angle, and (3) a linear strength envelope, i.e., a low Hoek-Brown (HB) strength parameter m (i) . After summarizing the underlying reasons of these problems through analyzing previous researchers' work, flat-joint model (FJM) is used to calibrate Jinping marble and is found to closely match its macro-properties. A parametric study is carried out to systematically evaluate the micro-parameters' effect on these three macro-properties. The results indicate that (1) the UCS/TS ratio increases with the increasing average coordination number (CN) and bond cohesion to tensile strength ratio, but it first decreases and then increases with the increasing crack density (CD); (2) the HB strength parameter m (i) has positive relationships to the crack density (CD), bond cohesion to tensile strength ratio, and local friction angle, but a negative relationship to the average coordination number (CN); (3) the internal friction angle increases as the crack density (CD), bond cohesion to tensile strength ratio, and local friction angle increase; (4) the residual friction angle has little effect on these three macro-properties and mainly influences post-peak behavior. Finally, a new calibration procedure is developed, which not only addresses these three problems, but also considers the post-peak behavior.
引用
收藏
页码:1813 / 1830
页数:18
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