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SUMMARY:Geotechnical Properties and Foundation Requirements of the Lunar L
 aser Ranger at Matjiesfontein Space Geodesy Observatory
DTSTART;VALUE=DATE-TIME:20140930T123000Z
DTEND;VALUE=DATE-TIME:20140930T124500Z
DTSTAMP;VALUE=DATE-TIME:20261006T151655Z
UID:indico-contribution-3996@events.saip.org.za
DESCRIPTION:Speakers: Susan Bothma (Stellenbosch University)\nThe intentio
 n of this project is to investigate and analyse the requirements for the e
 mplacement of the Lunar Laser Ranger (LLR) at the Matjiesfontein Space Geo
 desy Observatory (MGO). To ensure accurate measurements and pointing to th
 e exact location on the moon the LLR needs a very stable foundation. The f
 oundation of the LLR should be such that it would cushion the smallest mov
 ement of the ground. To ensure that the ground on which the 7 ton LLR will
  be built is stable a complete slope stability analysis needs to be done. 
 This includes investigations for circular slip failure\, wedge failure and
  planar failure. Other slope stability analyses that have been done at the
  MGO include the area adjacent to the Gravimeter Vault site\, a proposed s
 ite for the LLR and the proposed site for the main buildings. All of these
  studies have determined that these areas are safe to circular slip\, topp
 ling and wedge failure. The only instability that may occur on the site is
  possible planar failure if an access road with a cut of 2m is to be made 
 on the northern side of the site. The cut will expose the toe of the incli
 ned quartzitic sandstone that may lead to a failure. A retaining wall was 
 designed for the site where the administrative buildings will be placed to
  ensure the safety of the building as a cut will be made into the toe of t
 he slope. More detailed analysis will be done to determine the rock proper
 ties of the LLR site and to confirm the stability. \nThe main concern duri
 ng construction is early thermal shrinkage. Early thermal shrinkage can in
 fluence the geometry and dimensions of a structure. The cracks can cause d
 isplacement of the LLR and lower the accuracy of the measurements. Various
  construction risks have to be taken into consideration to ensure smooth o
 perations during construction. A complete risk register will be developed 
 prior to the start of construction operations.\n\nhttps://events.saip.org.
 za/event/40/contributions/3996/
LOCATION:Matjiesfontein's Lord Milner Hotel Conference Room\, Matjiesfonte
 in Station
URL:https://events.saip.org.za/event/40/contributions/3996/
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