Journal of The School of Marine Science and Technology,Vol.3 No.1
Dynamic Response of Fully Grouted Rockbolts During Shaking
Yoichi OWADA and Omer AYDAN
Abstract
Rock structures such as underground powerhouses,tunnels,dams undergo various loading conditions during their
construction and service lives.Particularly dynamic loads involve blasting,vehicle traffic and vibrations induced by
power generation. As time goes by, support system may deteriorate as a result of corrosion, micro cracking and
motions along rock discontinuities in rock masses. The main purpose of this experimental study is to clarify the
response of rockbolts and rock anchors through model tests subjected to cyclic loads by a shaking table.The model
rockbolts tested in the model tests were fully grouted rockbolts. The model experiments described in this article
clearly demonstrated that the dynamic loads may cause additional stretching on support systems utilizing rockbolts
and rock anchors due to the permanent deformation along rock discontinuities as a result of active sliding and active
toppling type of motions. Therefore, further considerations on the assessment of short and long term on support
systems utilizing the rockbolts and rock anchors as part of the total system are felt to be necessary.