›› 2017, Vol. 38 ›› Issue (9): 2701-2707.doi: 10.16285/j.rsm.2017.09.030

• Geotechnical Engineering • Previous Articles     Next Articles

A method for estimating rock mass joint size using borehole camera technique

WANG Jin-chao1, 2, WANG Chuan-ying1, TANG Xin-jian1, HU Sheng1, HAN Zeng-qiang1, WANG Yi-teng1, 2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-04-25 Online:2017-09-11 Published:2018-06-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (41372317) and Guangdong Province Science and Technology Planning Project of Research on Subway Surrounding Terrain Monitoring Technology (2013B010401020).

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Abstract: At present, determining the rock joint size is usually based on the joint trace length in exposed rock area, but the estimated results are often affected by the limited area of exposed rock mass. In this research, we try to estimate the rock mass size according to the joint characteristics around a borehole. At first, the joint and dip information in a geological drill is obtained through the borehole camera technology, a equation for joint plane is developed in the range of drilling depth. Based on this equation, the connectivity criterion among the joint surfaces is constructed and the joint surface trace length is determined; subsequently, the trace mean function of trace length. Finally, the size of rock joint is estimated according to the relationship between trace length and the rock mass size.This method is applied to the combined underground mining-ore dressing of Zhangjiawan iron ore, showing its reability and high accuracy.

Key words: borehole camera, joint size, trace length, connectivity, mean value function

CLC Number: 

  • TU 452

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