FDEM NUMERICAL STUDY ON THE FRACTURE AND SWELLING DEFORMATION OF HETEROGENEOUS ROCK MASS AROUND TUNNEL BASED ON WEIBULL DISTRIBUTION

被引：0
|
作者：
Deng P.-H. [1 ]
Liu Q.-S. [1 ]
Huang X. [2 ]
机构：
[1] School of Civil Engineering, Wuhan University, Hubei, Wuhan
[2] Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Hubei, Wuhan
来源：
Gongcheng Lixue/Engineering Mechanics | 2024年 / 41卷 / 07期
关键词：
FDEM; fracture and swelling deformation; heterogeneity; heterogeneous rock mass; rock mass around tunnel; Weibull distribution;
D O I：
10.6052/j.issn.1000-4750.2022.06.0541
中图分类号：
学科分类号：
摘要：
Rock materials are heterogeneous, and the strength of mineral particles and cementitious materials obey Weibull distribution statistically. Based on the combined finite-discrete element numerical method (FDEM), the parameter assignment process of elastic modulus and strength which obey to Weibull distribution is proposed. Then, the mechanical characteristics and failure behavior of heterogeneous rock samples under uniaxial compression, triaxial compression and Brazilian splitting are studied. Finally, the fracture and swelling deformation mechanism of heterogeneous rock mass around tunnel with high in-situ stress is investigated. The results show that: The FDEM numerical model, the number of triangular element with different elastic modulus obeys Weibull distribution, can be built by using the random parameter assignment method proposed in this paper; The uniaxial compressive strength, triaxial compressive strength, Brazilian splitting tensile strength, equivalent cohesion and equivalent internal friction angle of heterogeneous rock samples increase exponentially with the increase of heterogeneity m, and then approach to homogeneous materials; With the increase of m, the shape of fracture network changes little, mainly conjugate shear fracture, accompanied by a small number of tensile fractures, however, the failure degree of surrounding rock mass and the fracture propagation range decreases exponentially. © 2024 Tsinghua University. All rights reserved.
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页码：40 / 59
页数：19
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