INVESTIGATION ON BOND CAPACITY DEPENDENCY TO GROUT SHEAR STRENGTH IN DEFORMED ROCK BOLTS

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MOUSAVI M.; MAAREFVAND P.; PASHANEJATI M.

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Journal: Year:2002 | Volume:36 | Issue:2 (76) Page(s): 289-296

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Title

INVESTIGATION ON BOND CAPACITY DEPENDENCY TO GROUT SHEAR STRENGTH IN DEFORMED ROCK BOLTS

Author(s)

MOUSAVI M. | MAAREFVAND P. | PASHANEJATI M. | Issue Writer Certificate

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Abstract

The stability of underground excavations during and after construction is the main concern of geotechnical design engineers. Rock masses contain natural discontinuities, which may cause stability problems, therefore, most underground openings need to be stabilized to maintain their integrity during their service life. The best way to achieve this is through the use of reinforcement to help maintain the load-carrying capability of rock masses near excavation boundaries. Rock bolt is the most widely used type of reinforcement in rock engineering projects. Although numerous research on the bond capacity of a bolt is available but the detail study of the bond failure mechanism in this type of reinforcement has yet to be done. The main component of the bond capacity in rock bolts is mechanical interlocking, which after onset of slip, mobilizes the shear strength of the grout against the steel ribs. Similar to any rough interface, the most important factors controlling the shear strength at bolt-grout interface are confining pressure and grout properties. To study the pressure dependency of bond strength of a deformed bar, as well as the effect of cement shear strength and rib shape, a modified triaxial Hoek cell was designed to facilitate application of a radial confining pressure to a grouted bolt while pulling it axially. During the test, both axial displacement of the bolt as well as the radial dilation of the grout was monitored. Few deformed bolts were designed and manufactured to study the effect of the shape of the ribs. While pull out, the cement that is captured between lugs will shear which in turn emphasizes the importance of shear strength of the grout annulus. In this report, details of the laboratory test results are presented and conclusions are given based on the obtained results

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APA: Copy

MOUSAVI, M., MAAREFVAND, P., & PASHANEJATI, M.. (2002). INVESTIGATION ON BOND CAPACITY DEPENDENCY TO GROUT SHEAR STRENGTH IN DEFORMED ROCK BOLTS. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), 36(2 (76)), 289-296. SID. https://sid.ir/paper/14161/en

Vancouver: Copy

MOUSAVI M., MAAREFVAND P., PASHANEJATI M.. INVESTIGATION ON BOND CAPACITY DEPENDENCY TO GROUT SHEAR STRENGTH IN DEFORMED ROCK BOLTS. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)[Internet]. 2002;36(2 (76)):289-296. Available from: https://sid.ir/paper/14161/en

IEEE: Copy

M. MOUSAVI, P. MAAREFVAND, and M. PASHANEJATI, “INVESTIGATION ON BOND CAPACITY DEPENDENCY TO GROUT SHEAR STRENGTH IN DEFORMED ROCK BOLTS,” JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), vol. 36, no. 2 (76), pp. 289–296, 2002, [Online]. Available: https://sid.ir/paper/14161/en

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