(1) field exploration <br>field exploration completed by the rig 100, the opening diameter of 146mm, 110mm diameter final hole, using all drilling mud wall core drilling, the drilling specific control operation according to the method "investigation of geotechnical engineering" (GB 50021 - 2001, 2009 edition) and section 9.2.4 "construction engineering geological exploration and sampling technical Specification" (JGJ87 / T-2012) to perform. <br>To avoid causing exploration to project adversely harm (hazards), and observation after test drilling work is completed, all with the original soil or dry powdered clay for the drilling location hierarchy irrigation real backfill.
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