In-Situ Evaluation of Adhesion Resistance in Anchor Root Zone

Evirgen B., Tuncan M., Tuncan A.

2nd GeoMEast International Congress and Exhibition on Sustainable Civil Infrastructures, Egypt 2018 - The official international congress of the Soil-Structure Interaction Group in Egypt, SSIGE 2018, Cairo, Egypt, 24 - 28 November 2018, pp.181-190 identifier

  • Publication Type: Conference Paper / Full Text
  • Doi Number: 10.1007/978-3-030-01884-9_13
  • City: Cairo
  • Country: Egypt
  • Page Numbers: pp.181-190
  • Keywords: Anchor Cables, Bond Zone, Grouting Material, Pullout Capacity, Soil Nailing
  • Anadolu University Affiliated: Yes


© 2019, Springer Nature Switzerland AG.An anchor body is formed by two parts as root zone (bonded length) and the free zone (unbonded length). The main resisting part against the pull out force is the root zone. The similar phenomena is valid for pile or pier foundations, which work according to the side friction arising from external pulling elements. Serious problems can be occur in case the loss of adhesion or frictional resistance between injected grouting material and soil interaction surface. Twelve boreholes were drilled with 22.0 cm in diameter and 2.0 m in length within the aim of assessing this problem. Four different concrete mixtures consist of standard injection mix, gravelly, fine sandy and clayey soils were poured into the holes over 1.0 m from the bottom level. Tremie pipe was also used to elimination of segregation. An anchor cable was placed in the center of each hole with 3.5 m length before the pouring process of mixtures. At the end of 28 days, after completion the setting time of concrete, tendons were subjected to the pull out tests in vertical direction. Pulling force, side friction and displacement values were compared. Thereby, the influence of impurities such as gravel, sand and clay on the adhesion strength were compared that change the mix properties during concrete pouring or injection into the anchor hole.