Rock Anchors for Static Pile Load Testing: Considerations and Case Studies
By: Kulkarni, Sujan
.
Contributor(s): Vaidya, Ravikiran.
Publisher: Germany Springer 2021Edition: Vol.51(1), February.Description: 205-210p.Subject(s): Civil EngineeringOnline resources: Click here
In:
Indian geotechnical journalSummary: It is common practice in India to install rock anchors around test pile in order to obtain reaction for static load tests wherever competent rock is encountered at reasonable depths. Rock anchor design and installation require adequate attention as it is dependent on several parameters and checks. Authors have performed several static load tests across India with rock anchors up to test load of around 2000tons and also in various rock formations such as Basalt, Breccia, Tuff, Granite, Sandstone, etc. Competent rock levels also have been seen to be varied to great extent such as around 20 m from ground surface and such long free lengths offer several challenges including extension of strands equal to or more than ram stroke. Typically, for rock anchors in soft rocks, computed fixed length may be more than 10 m, and BS code 8081:1989 limits the fixed length to 10 m. In order to assess the rock anchor behavior for such condition where fixed length was more than 10 m, an effort was made to test the anchors to its full capacity and corresponding experience will also be summarized in the paper in the form of case history. This paper addresses rock anchor design philosophy including several checks required for appropriate rock anchor design, approaches for rock anchor design in soft rock, author’s experience of rock anchor design and installation with various rock types across India, along with case studies. Paper will also highlight benefits and limitations associated with installation of inclined anchors for crown girder assembly.
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School of Engineering & Technology (PG) Archieval Section | Not for loan | 2021-2022249 |
It is common practice in India to install rock anchors around test pile in order to obtain reaction for static load tests wherever competent rock is encountered at reasonable depths. Rock anchor design and installation require adequate attention as it is dependent on several parameters and checks. Authors have performed several static load tests across India with rock anchors up to test load of around 2000tons and also in various rock formations such as Basalt, Breccia, Tuff, Granite, Sandstone, etc. Competent rock levels also have been seen to be varied to great extent such as around 20 m from ground surface and such long free lengths offer several challenges including extension of strands equal to or more than ram stroke. Typically, for rock anchors in soft rocks, computed fixed length may be more than 10 m, and BS code 8081:1989 limits the fixed length to 10 m. In order to assess the rock anchor behavior for such condition where fixed length was more than 10 m, an effort was made to test the anchors to its full capacity and corresponding experience will also be summarized in the paper in the form of case history. This paper addresses rock anchor design philosophy including several checks required for appropriate rock anchor design, approaches for rock anchor design in soft rock, author’s experience of rock anchor design and installation with various rock types across India, along with case studies. Paper will also highlight benefits and limitations associated with installation of inclined anchors for crown girder assembly.
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