岩体结构面产状测量的钻孔摄像技术及其可靠性

曹洋兵; 晏鄂川; 胡德新; 季惠彬

doi:10.3799/dqkx.2014.045

Volume 39 Issue 4

Apr. 2014

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Cao Yangbing, Yan Echuan, Hu Dexin, Ji Huibin, 2014. Calculation Methods of Rock Mass Discontinuity Orientation Measured by Borehole Camera Technology and Technology Reliability. Earth Science, 39(4): 473-480. doi: 10.3799/dqkx.2014.045

Citation:

Cao Yangbing, Yan Echuan, Hu Dexin, Ji Huibin, 2014. Calculation Methods of Rock Mass Discontinuity Orientation Measured by Borehole Camera Technology and Technology Reliability. Earth Science, 39(4): 473-480. doi: 10.3799/dqkx.2014.045

Citation:

Cao Yangbing, Yan Echuan, Hu Dexin, Ji Huibin, 2014. Calculation Methods of Rock Mass Discontinuity Orientation Measured by Borehole Camera Technology and Technology Reliability. Earth Science, 39(4): 473-480. doi: 10.3799/dqkx.2014.045

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Calculation Methods of Rock Mass Discontinuity Orientation Measured by Borehole Camera Technology and Technology Reliability

doi: 10.3799/dqkx.2014.045

1.
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
2.
Beijing New Oriental Star Petrochemical Engineering Co. Ltd., Beijing 100070, China

Received Date: 2013-06-19
Publish Date: 2014-04-15

Abstract

Abstract

For the issue that borehole camera technology only is applied to the vertical borehole currently, the calculation process for discontinuity orientation in inclined borehole is presented in this paper. With the circle centre of drill orifice as the origin, the left-handed Cartesian coordinate system is constructed and the precise analytic formulas for discontinuity orientation in inclined borehole are obtained. On this basis, the IDOIB software is developed using C# programming language. The validity of analytic formulas and program are verified by the principle of borehole camera technology. In addition, the PVC pipe experiments are conducted to examine the reliability of borehole camera technology for measurement of discontinuity orientation. Results show that: (1) For vertical holes, absolute errors of dip directions range from -3° to 4°, and those of dips range from -1.5° to 1.0°. The technology is reliable for measurement of discontinuity orientation in vertical boreholes, and it can satisfy the needs of rock engineering. (2) For inclined PVC pipes with trend of 270° and plunge of 25°, the reliability degree of discontinuity orientation is 0.10; while inclined PVC pipes with trend of 176° and plunge of 60°, the reliability degree of discontinuity orientation is 0.67. The difference of pipe plunge results in the reliability difference of discontinuity orientation. (3) The reliability of discontinuity orientation should be high (the reliability degree is no less than 0.8) for general rock engineering, so the plunge of inclined borehole should be no less than 71°.
- borehole camera technology,
- rock,
- discontinuity,
- orientation,
- reliability,
- image interpretation,
- engineering geology

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References(32)

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Calculation Methods of Rock Mass Discontinuity Orientation Measured by Borehole Camera Technology and Technology Reliability

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