Back to Basics (plus a little extra) on Geotechnical ...

Back to Basics (plus a little extra) on Geotechnical Engineering: Ground Compaction Alan Parrock 1971 - First exposed to soil mechanics at university 1973 Natal Roads Department 1976 Professional engineer 1976 NITRR of the CSIR 1978 BKS now Aecom 1982 First exposed to rock mechanics 1993 Founded ARQ 2007 Fellow of SAICE 2010 Geotechnical Division Gold Medal 2011 Keynote address 15 ARC in Maputo 2013 Keynote address Geo Africa Ghana 2015 - Convenor SABS TC98 SC006 responsible for drafting the new SA Geotechnical design code and reliability based design approach COMPACTION in the beginning TMH1-1979 Test Mass (kg) Drop height (m) Number of blows Layers Input energy (kNm) Volume (m3) Energy/Volume (kNm/m3) Mod AASHTO 55 5 2415 NRB 25 5 1098 Proctor 55 3 531 Impact roller Five sided 20 1 * 132 Three sided 20 1 * 224 Ram compaction* 7*7*5 11500 20 1 170 5*5*5 11500 20 1 334 5*5*4 11500 20 1 417 Vibratory compaction Bomag 212 300 1 ** 323 * = 1m depth ** = depth, 10 passes, and 30 vibrations/second RIC 12 000 45 1 16 200 441 RIC 12 000 45 1 16 200 441 y = R = 100 1000 10000 80 85 90 95 100 105 Energy (kNm/m3) Density as a percentage of Mod AASHTO Vs=1935/2700= Vv= Vw= E=Vv/Vs

Richards Bay Cont. •Four trials were conducted in test area: –Two trials with compaction of in situ material with a 1.5m diameter foot only –One trial with a stone column spacing of 7.5m with one in the middle –One trial with a stone column spacing of 5m with one in the middle • Testing was conducted before/after compaction and ...

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