Volume 35 Issue 5
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Wang Xiaobing, Wang Junqing. Characteristics of Rock Joints and Fissures Based on Borehole Television Technology[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2021, 35(5): 286-293. doi: 10.3969/j.issn.1007-2993.2021.05.002
Citation: Wang Xiaobing, Wang Junqing. Characteristics of Rock Joints and Fissures Based on Borehole Television Technology[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2021, 35(5): 286-293. doi: 10.3969/j.issn.1007-2993.2021.05.002
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Characteristics of Rock Joints and Fissures Based on Borehole Television Technology

doi: 10.3969/j.issn.1007-2993.2021.05.002

  • China Nuclear Industry Geotechnical Engineering Co., Ltd., Zhengzhou, Henan, Zhengzhou 450000, Henan, China

  • Received Date: 2020-10-14
  • Publish Date: 2021-10-22
    Abstract
  • The analysis of rock joints and fissures is an important basis for engineering geological evaluation of rock mass characteristics. Panoramic borehole television technology can clearly and intuitively observe the development characteristics of rock joints and fissures in the borehole. based on the panoramic borehole television image, through the interpretation, statistics and other quantitative analysis of the joints and fissures in two boreholes of a nuclear power project in Hainan, the strike and dip range of the main joints in the rock mass are determined, and the dominant joints are analyzed; the dip angle and linear density of the joints and fissures in the rock mass are statistically analyzed. On this basis, IRMI index of rock mass quality is used to evaluate the rock integrity of the test holes, and the RQD value and acoustic test results are compared. The limitations of panoramic borehole television technology is analyzed. The results show that: the IRMI value of rock mass quality index of borehole television is higher than that of drilling RQD, and the quality degree of rock mass is better than RQD; the structural position, occurrence and filling material of rock mass can be observed directly and clearly through borehole television, and the mechanical fracture and joint fracture of rock mass can be distinguished, which can make up for the lack of core drilling technology to a certain extent. It is more accurate to evaluate the quality of rock mass by combining IRMI index, RQD value and acoustic test results.

     

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