Detection of thin weak zone in weathered rocks from automatic monitoring of pneumatic rotary-percussive drilling

【Author】

J.Chen W.Gao Z.Q.Yue Department of Civil Engineering.The University of Hong Kong,Hong Kong,China

【Abstract】

<正>Weathered rock mass can have thin weak zones or cavities.These weak zones or cavities may not be detected during conventional ground investigation because the drillhole investigation is limited and the weak zones are thin.This paper uses the recently developed DPM methodology to divide the DPM data into sub-processes such as pushing,pulling and drilling and builds criteria so that thin weak zones can be detected from the sorted DPM data.The method establishes the relationship between the drilling rate and its downward thrust pressure and the relationship between the pushing-in rate and its downward thrust pressure.Case studies are given to illustrate the detection method.The case studies demonstrate that the proposed method has good potential for accurately detecting thin weak zones in weathered granitic or volcanic rocks.

【Keywords】

Detection of thin weak zone in weathered rocks from automatic monitoring of pneumatic rotary-percussive drilling;

References

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Total: 10 articles

  • [1] N. Barton;;V. Choubey, The shear strength of rock joints in theory and practice, Rock Mechanics Felsmechanik Mécanique des Roches,
  • [2] Yue,Z.Q;Lee,C.E; & Law,K.T, Automatic monitor- ing of rotary-percussive drilling for ground characteriza- tion—illustrated by a case example in Hong Kong, Inter- national Journal of Rock Mechanics & Mining Science,
  • [3] Yue,Z.Q;Guo,J.Y;& Tham,L.G.et al, Drilling process monitoring for ground characterizations during. soil nailing in weathered soil slopes, Proceedings of the 2nd International Conference on Site Characteri- zation (ISC-2),
  • [4] Yue,Z.Q;Lee,C.F;& Tham,L.G, Automatic drilling processmonitoring for rationalizing soil nail design and construction, Proceedings of the 2004 Annual Seminar of HKIE Geotechnical Division,

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