CLASSIFICATION AND ZONING OF MARBLE SITES - HKU Libraries

- 33 -B.ISITE BOnly the preliminary ground investigation has been completed on this site.Table Bl lists the MQD values of the boreholes.Figure Bl shows the borehole rating and the bottom levels of the surface karst.Due to widely spaced borehole information, the reconstruction of the karstmorphology is not possible. However, out of the 31 boreholes plotted,, 35% (11 holes) arewith rating > 5. The site would therefore be classified as "very difficult", implying the needfor very detailed ground investigation and probably building reorientation to avoid difficultground.A NE-SW line can however be drawn across the site. The lower half of the site iscavity free. The upper half of the site would have 55% of its holes (10 out of 18) withborehole rating > 5. This half of the site would be classified as "extremely difficult 11 withall its engineering implications.