Volume 19 Issue 1
Feb.  2011
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CHEN Jian, YUE Zhongqi. 2011: DPM SYSTEM BASED DETECTION AND CHARACTERIZATION OF WEAK ZONES IN WEATHERED ROCK. JOURNAL OF ENGINEERING GEOLOGY, 19(1): 93-98.
Citation: CHEN Jian, YUE Zhongqi. 2011: DPM SYSTEM BASED DETECTION AND CHARACTERIZATION OF WEAK ZONES IN WEATHERED ROCK. JOURNAL OF ENGINEERING GEOLOGY, 19(1): 93-98.

DPM SYSTEM BASED DETECTION AND CHARACTERIZATION OF WEAK ZONES IN WEATHERED ROCK

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  • Received Date: 2010-01-27
  • Rev Recd Date: 2010-04-22
  • Publish Date: 2011-02-25
  • Weathered rock mass often contain weak zones. The weak zones reduce the mechanical strength of rock mass substantially.To locate and describe the weak zones,drillholes are employed to take rock samples. But,because of reason of economic and construction period,the number of drillholes is limited and the weak zones cannot be located accurately and efficiently. This causes problems in accurately analyzing mechanical properties of rock mass. This kind of problems can induce instability of rock mass in slopes and foundations. This paper introduces a new method to detect and characterize weak zones in weathered rock mass. This method applies Drilling Process Monitoring system(DPM)to monitor the full drilling processes for installation of soil nails,tiebacks,anti-slide piles and so on. Without taking samples,the weak zones can be detected and characterized with the analysis of DPMdata. The case study shows that this method can efficiently and quickly detect and characterize the weak zones in weathered rock mass. This method can be useful to better investigate weathered rock mass for design and construction.
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    [4] Sugawawa, J. , Yue, Z.Q. , Tham, L.G. , Lee,C.F. & Law,K.T. Weathered rock characterization using drilling parameters. Canadian Geotechnical Journal, 2003, 40 (3): 661~668.

    [5] Yue, Z.Q. , Lee, C.F. , Law, K.T. , Tham, L.G. , Sugawara,J. Use of HKU drilling process monitor in soil nailing in slope stabilization,Chinese journal of rock mechanics and engineering, 2002, 21 (11): 1685~1690.

    [6] Yue, Z.Q. , Lee, C.F. , Law,K.T. & Tham,L.G. Automatic monitoring of rotary-percussivedrilling for ground characterization - illustrated by a case example in Hong Kong,International Journal of Rock Mechanics & Mining Science, 2004, 41 : 573~612.

    [7] Yue, Z.Q. , Guo, J.Y. , Tham,L.G. & Lee,C.F. Drilling process monitoring for ground characterizations during soil nailing in weathered soil slopes,Proceedings of the 2nd International Conference on Site Characterization(ISC-2),Porto,Portugal, 2004,2, 1219~1224.

    [8] Yue, Z.Q. , Lee,C.F. & Tham,L.G. Automatic drilling process monitoring for rationalizing soil nail design and construction,Proceedings of the 2004 Annual Seminar of HKIE Geotechnical Division,Hong Kong,China, 2004,217~234.

    [9] Yue, Z.Q. , Gao, W. , Chen, J. , Lee,C.F. Drilling process monitoring for a wealth of extra factual data from drillhole site investigation, Proc. of the 10th international congress of the international association of engineering geology,Nottingham,United Kingdom, 2006, Theme 5 - Urban Site Investigation,5~746,1~10(CD RAM softcopy).

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