Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (3): 66-72.doi: 10.6040/j.issn.1672-3961.0.2019.393

• Civil Engineering • Previous Articles     Next Articles

Numerical simulation of mechanical properties of layered jointed rock mass

Ziyao XU(),Song YU*(),Qiang FU   

  1. School of Civil Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2019-07-15 Online:2020-06-01 Published:2020-06-16
  • Contact: Song YU E-mail:xuizyaoshenlan@foxmail.com;yusong@sdu.edu.cn
  • Supported by:
    国家自然科学基金面上资助项目(51579140)

Abstract:

GDEM software was used to analyze the mechanical properties of parallel layered jointed rock masses from different angles, and explore the influence of the change of the angle between the joint angle and the loading direction on the failure mode of the specimen, the parallel layered joint model was established by using different interlayer rock materials commonly in engineering. Through three loading methods, such as static load uniaxial compression, biaxial compression and pure shear, failure forms of such rock mass model at different inclined angles, the stress-strain relationship in the loading process and the variation trend of peak load were analyzed. This study found that the mechanical properties and peak strength of the parallel-level jointed rock mass were directly related to the joint inclination angle. It was found by simulation that the parallel-level jointed rock mass obvious elastic-brittle mechanics under three loading conditions.

Key words: joints, discrete element method, failure mode, mechanical properties, anisotropy

CLC Number: 

  • TU45

Table 1

Mechanical parameter of rock and joint sets"

介质 密度/(kN·m-3) 弹性模量/GPa 泊松比 内摩擦角/(°) 粘聚力/MPa
泥岩 14 30 0.3 30 7.3
砂岩 25 12 0.25 40 4.2
石灰岩 22 37 0.4 37 4.0
节理 10 10 0.1 20 0.6

Fig.1

Layered jointed rock mass model at different angles"

Fig.2

Stress condition of model"

Fig.3

Principal stress contour maps"

Fig.4

Stress-strain curves of jointed rock massunder uniaxial pressure"

Fig.5

Curve of uniaxial compression strengths varieswith different slant angle"

Fig.6

Principal stress contour map with 0.5 MPa lateral pressure"

Fig.7

Stress-strain curves with 0.5 MPa lateral pressure"

Fig.8

Curves of peak strength under 0.5 MPa lateral pressure with different slant angle"

Fig.9

Principal stress contour map of shearing test"

Fig.10

Stress-strain curves of jointed rock massunder shearing load"

Fig.11

Curve of shearing strength with different slant angle"

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