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| EXPERIMENT AND CALCULATION MODEL FOR ESTIMATING EFFECTS OF ANCHOR-ROOT AT BOTTOM OF FULL-LENGTH BONDED BOLT |
| LIU Bo1，2，LI Dongyang1 |
(1. School of Mechanics and Civil Engineering，China University of Mining and Technology，Beijing 100083，China；
2. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Beijing，100083，China) |
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Abstract Installing the anchor-root at the bottom of full-length bonded bolt in rock foundation could not only strengthen the anti-pullout capability of bolt anchorage system but also reduce the bolt length. A series of laboratory and in-situ tests are carried out to study the behavior of anchor-root. Two groups of bolts with different lengths are tested for comparing the curves of axis force along the depth，and one group of anchor-root bolts is installed for tests. The relationships between the installation location of anchor-root，the anchorage length，the bolt diameter，the shear stiffness between bolt and mortar are studied. The experiment results show that because the load transmits from the top to the bottom，the anchor-root plays the role when the small load is applied on short full-length bonded bolt. On the basis of curve characteristics of bolt axis force，an assumption that the anchor-root role is equivalent to anchorage length added is proposed，and the calculation model is established. Compared with measured data，this model can be used to predict the effect of anchor-root at the bottom of full-length bonded bolt.
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Received: 06 April 2010
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2011, Vol. 30 
