Abstract
The self-drilling prestressed anchor is a type of ground anchor used to transmit the applied tensile load into soil or rock through cement grout. The paper outlines a general construction procedure using a special self-drilling bit. Based on the load-transfer mechanism, the construction procedure is presented for load-dispersed ground anchors. In-situ pullout tests were carried out for three self-drilling prestressed anchors of the load-dispersed compression type. The test results showed that the ultimate pullout capacity could reach 800 – 1,000 kN. After prestressing, the displacement of the anchor head was decreased by 50 % – 70 % for a low load level and 30 % – 40 % for a high load level, and the displacement induced by elastic deformation was much smaller than that induced by plastic deformation. These results demonstrate that this anchor type is suitable and economical for practical engineering needs.
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