CLASSIFICATION AND ZONING OF MARBLE SITES - HKU Libraries

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- 6 -11. POTENTIAL DEVELOPMENT 1512. REFERENCES 16LIST OF FIGURES 17APPENDIX A : CLASSIFICATION OF MARBLE SITE - SITE A 26APPENDIX B : CLASSIFICATION OF MARBLE SITE - SITE B 32PageNo.
- 7 -1. INTRODUCTIONIn January 1989, the Mainland West Division of the Geotechnical Control Officestarted a search for a system of classifying or zoning marble sites.- This report records thework done and the details of the proposed system as illustrated by case examples.2. AIMThe aim of the exercise is to develop a system of classifying or zoning marble sitesbased on borehole data to :(i)(ii)obtain an indication of the difficulty of designing andconstructing foundations.gain a better understanding of the geology.Regarding (i), there are two levels of engineering applications. The first level is toclassify sites from the preliminary stage ground investigation. The site classes should allowthe engineer to decide on the potential foundation problems and solutions and hence to plana good stage 2 ground investigation with a good idea of what to look for. The second levelis to assist interpretation of all ground investigation data to decide on a site class from whichthe engineer can draw precedent cases with regard to the choice of foundation types, foundinglevels and supervision requirement.By plotting the site classes on a geology map, we may be able to correlate site classeswith geology. This would in the future allow identification of potential difficult sites fromknown geology features and vice versa. This is however a secondary aim that may onlyrealise after data from sufficient number of sites are collected.3. CONSULTATIONThe Resident Consultant Geologist, Messrs Dames & Moore (HK) and Dr A.C.Meigh, all of them are GCO consultants serving on the marble study project, wereapproached for assistance. Dr A.C. Meigh provided a series of useful thoughts.In addition, the author is in debt to Dr R.L. Langford for his surface karst concept.4. KARST MORPHOLOGY4.1 Factors Affecting Karst DissolutionMarble or limestone is sparingly soluble in water with dissolved carbon dioxide. Thefollowing formula summarises the reaction involved.CaCO 3 + CO 2 + H 2 O ^ Ca* + + 2HCO 3 ~
Page 3: CLASSIFICATION ANDZONING OFMARBLE S
Page 7: - 5 -CONTENTSTitle Page 1PREFACE 3F
Page 11 and 12: - 9 -4.3 Karst Features in Yuen Lon
Page 13 and 14: - 11 -where lj is the length of cor
Page 15 and 16: - 13 -The ratings are applied separ
Page 17 and 18: - 15 -No simple rules exist for ver
Page 19 and 20: - 17 -LIST OF FIGURESFigureNo.PageN
Page 21 and 22: Original groundsurface£ Surfacekar
Page 23 and 24: - 21 --30M7892OOIT109.267.263.042.0
Page 25 and 26: .ReducedLevelImPD)ClassBH1FeatureRa
Page 27 and 28: -35 ODHS®DH1-40 .35®DH2 DH6® -40
Page 29 and 30: - 27 -A.ISITE ATable Al lists the M
Page 31 and 32: Table Al - MQD Values and Marble Ma
Page 33 and 34: - 31 -Borehole BH13Figure Al - Kars
Page 35 and 36: - 33 -B.ISITE BOnly the preliminary
Page 37 and 38: - 35 -Table Bl - MQD Values and Mar
Page 39 and 40: -25jfflBH9BH16BH20BH27BH2^'Legend :
Page 41 and 42: (Superseded by GEO Report No. 9)Rev
Page 43 and 44: Report on the Rainstorm of May 1982
Page 45 and 46: Geotechnical Area Studies Programme
Page 47 and 48: Mai Po : Superficial Geology (1:5 0
Page 49 and 50: Copies of GEO publications (except
Page 51 and 52: XDtDS7113LB 551,447 C45Chan, Y. C.C

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