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Gold Science and Technology >

2020 , Vol. 28 >Issue 3: 421 - 429

DOI: https://doi.org/10.11872/j.issn.1005-2518.2020.03.164

Mining Technology and Mine Management

Experimental Study on Crack Evolution and Fracture Characteristics of Rocks with Prefabricated Cracks

  • Chengcheng WANG ,
  • Xinyao LUO ,
  • Kexu CHEN ,
  • Bing DAI ,
  • Guicheng HE
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  • School of Resource Environment and Safety Engineering, University of South China，Hengyang 421001，Hunan，China

Received date: 2019-09-30

  Revised date: 2020-04-02

  Online published: 2020-07-01

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Highlights

Fracture rock mass is a kind of engineering rock mass widely existing in nature，which is easy to cause structural failure and instability of rock mass and induce engineering accidents under the action of external force.Therefore，it is necessary to study the crack evolution law and the fracture instability mechanism of rock mass with prefabricated fractures.In this paper，a lot of rock-like samples with prefabricated crisscross cracks were made based on the similarity theory.The uniaxial compression test on the rock-like samples with different fracture length and inclination angles were carried out by using the RMT-150B rock mechanics testing machine，and crack evolution law and fracture characteristics were analyzed.The research results show that the compressive strength of the samples with crisscross crack is significantly lower than that of the intact. The peak stress decreases with the increase of secondary crack length when the principal crack length of the sample is constant. The failure mode of the sample contain crisscross crack with the dip angle are 0° and 60° respectively shows the tensile wing cracks.The failure mode of the specimen contain crisscross crack with the dip angle are 30° and 45° respectively shows the tensile-shear mixed cracks, which have both wing-shaped cracks and se-condary coplanar cracks.

Cite this article

Chengcheng WANG , Xinyao LUO , Kexu CHEN , Bing DAI , Guicheng HE . Experimental Study on Crack Evolution and Fracture Characteristics of Rocks with Prefabricated Cracks[J]. Gold Science and Technology, 2020 , 28(3) : 421 -429 . DOI: 10.11872/j.issn.1005-2518.2020.03.164

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http://www.goldsci.ac.cn/article/2020/1005-2518/1005-2518-2020-28-3-421.shtml

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