Numerical Simulation of Fracture and Acoustic Emission Evolution of Hetero-geneous Rocks

CHENG Hao; XU Tao; ZHOU Guanglei; FANG Ke

doi:10.11872/j.issn.1005-2518.2018.02.170

Gold Science and Technology >

2018 , Vol. 26 >Issue 2: 170 - 178

DOI: https://doi.org/10.11872/j.issn.1005-2518.2018.02.170

Numerical Simulation of Fracture and Acoustic Emission Evolution of Hetero-geneous Rocks

CHENG Hao ,
XU Tao ,
ZHOU Guanglei ,
FANG Ke

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1.Tianjin Harbour Engineering Co.，Ltd.，China Communications Construction Co.，Ltd.，Tianjin 300450，China;2.Centre for Rock Instability & Seismicity Research，Northeastern University，Shenyang 110819，China

Received date: 2017-07-13

Revised date: 2017-09-29

Online published: 2018-05-19

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Abstract

Based on strain softening constitutive model，a damage softening constitutive model of heterogeneous rocks was established by considering the heterogeneity of rock material and the weakening characteristics of mechanical properties during damage process.The difference scheme of damage softening constitutive model was deduced and the further development of the damage softening constitutive model was achieved in FLAC3D under VC++ environment.The influence of different homogenization on mechanical properties and acoustic emission characteristic of rocks were numerically investigated. The results show that material heterogeneity has remarkable influence on the mechanical properties of rock samples. With the increase of material heterogeneity，there is a transition from ductile behavior into brittle fracture in rock failure. Meanwhile，peak strength and peak strain of rocks gradually increase，but residual strength of rocks gradually decreases.It is also found that the through-going shear fractures in the rock specimen lag behind for the more heterogeneous rock. Furthermore，there is a transition from low intensity and high frequency to high intensity and low frequency in AE characteristics of rock under uniaxial loading with an increase in heterogeneity of rock，and three typical AE patterns，swarm shock，foreshock-main shock-aftershock，and main shock，can be observed.

Key words： FLAC3D; strain softening; heterogeneity; rock failure; acoustic emission; compressive strength

Cite this article

CHENG Hao , XU Tao , ZHOU Guanglei , FANG Ke . Numerical Simulation of Fracture and Acoustic Emission Evolution of Hetero-geneous Rocks[J]. Gold Science and Technology, 2018 , 26(2) : 170 -178 . DOI: 10.11872/j.issn.1005-2518.2018.02.170

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