Strength reduction model for jointed rock masses and peridynamics simulation of uniaxial compression testing

2021 ◽  
Vol 7 (2) ◽  
Author(s):  
Chenglu Gao ◽  
Zongqing Zhou ◽  
Liping Li ◽  
Zhuohui Li ◽  
Daosheng Zhang ◽  
...  
Keyword(s):  
Uniaxial Compression ◽  
Jointed Rock ◽  
Strength Reduction ◽  
Compression Testing ◽  
Rock Masses ◽  
Jointed Rock Masses ◽  
Reduction Model

An experimental study of mechanical behavior of brittle rock-like specimens with multi-non-persistent joints under uniaxial compression and damage analysis

2019 ◽  
Vol 28 (10) ◽  
pp. 1490-1522 ◽  
Author(s):  
Wendong Yang ◽  
Guizhi Li ◽  
PG Ranjith ◽  
Lindong Fang
Keyword(s):  
Mechanical Behavior ◽  
Young’S Modulus ◽  
Uniaxial Compression ◽  
Joint Angle ◽  
Young's Modulus ◽  
Jointed Rock ◽  
Peak Strength ◽  
Rock Masses ◽  
Jointed Rock Masses ◽  
Joint Length

The mechanical behavior of jointed rock masses significantly affects the stability of rock engineering applications. In this paper, the peak strength, Young's modulus and failure patterns of brittle rock-like specimens with multi-non-persistent joints under uniaxial compression are investigated. The joint geometry is defined by four factors: joint angle, spacing, joint length, and rock bridge length. The experiment results show that the joint angle has the greatest influence on the peak strength and Young's modulus of specimens, followed by joint length. A damage mechanical theory is adopted which deals with some sets of joints distributed in rock masses. Based on the geometrical distribution of joints, a macro damage model which considers the influence of the normal vector and area density of joints is used to describe the joints. The peak strength and Young's modulus of jointed specimens predicted by the damage mechanics method reflect the trend of the experimental results, which proves the influence of initial geometric damage of joints on the peak strength and Young's modulus of jointed specimens. The initial geometric damage of joints is mainly induced by the joint area density. Finally, from the micro damage aspect, to analyze the damage evolution and strain softening process of jointed rock masses, a modified numerical model (damage strainsofting model) on the basis of secondary development in fast Lagrangian analysis of Continua is proposed to simulate the fracture development of jointed rock masses. The peak strengths, Young's modulus and failure modes of rock specimens with non-persistent joints under uniaxial compressions are simulated and compared with the results obtained from the lab experiments indicating that the model is capable to replicate the physical processes.

scholarly journals Mechanical and failure characteristics of rock-like material with multiple crossed joint sets under uniaxial compression

2017 ◽  
Vol 9 (7) ◽  
pp. 168781401770871 ◽  
Author(s):  
Jiaming Liu ◽  
Shaorui Sun ◽  
Ling Yue ◽  
Jihong Wei ◽  
Jimin Wu
Keyword(s):  
Compressive Strength ◽  
Young’S Modulus ◽  
Uniaxial Compression ◽  
Unconfined Compressive Strength ◽  
Failure Modes ◽  
Young's Modulus ◽  
Jointed Rock ◽  
Rock Masses ◽  
Joint Spacing ◽  
Jointed Rock Masses

The strength and deformation of rock masses transected by persistent joints are controlled by the fracture network. In this work, bonded particle model modeled by particle flow code in three dimensions was used to study the effect of geometry parameters on the strength and behavior of jointed rock masses under uniaxial compression. The effect of the number of crossed joint sets, joint orientation, and joint spacing on the uniaxial compressive strength was investigated, and this article presents the results of the numerical simulations. Rigorous validation process had done before the numerical experiments. Four types of blocks (Series A, B, C, and D) with different numbers of joint sets were considered in this article. Then, a sensitivity study is undertaken to investigate the effects of joint set numbers and joint geometry configuration on the failure mode, unconfined compressive strength, and Young’s modulus of jointed rock mass. The interaction among the crossed joint sets was found to have marked effects on the mechanical properties and failure modes. A study about the effects of joint spacing on the failure modes, unconfined compressive strength, and Young’s modulus was also conducted. Joint spacing was found to have no significant effect on the failure modes of jointed rock masses in a certain range. It is also shown that the range and variance of unconfined compressive strength are affected principally by joint set numbers and decreased slightly with the decrease in joint spacing. The effect of crossed joint sets on the stress field was carried out. Stress concentration was found to be the reason for relatively lower strength of blocks with crossed joint sets compared to the block with the same weakest single joint set. The result in this article is of great help to reveal the mechanism of damage and fracture of jointed rocks under uniaxial compression.

A Multivariate Technique for Evaluating the Statistical Homogeneity of Jointed Rock Masses

2014 ◽  
Vol 48 (5) ◽  
pp. 1821-1831 ◽  
Author(s):  
Yanyan Li ◽  
Qing Wang ◽  
Jianping Chen ◽  
Shengyuan Song ◽  
Yunkai Ruan ◽  
...  
Keyword(s):  
Jointed Rock ◽  
Rock Masses ◽  
Jointed Rock Masses ◽  
Multivariate Technique ◽  
Statistical Homogeneity
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