High quality and cost effective drilling system for ...
2013-12-1 · An innovative mechanical drilling system (MDS) has been developed for the preparation of vertical smooth surface borehole of constant diameter for the pressuremeter testing. The PMT was conducted in boreholes drilled by MDS, rotary rig (RR) and hand auger (HA) at a site that comprised clayey silt (CL-ML) and sandy silt (ML) deposits.
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