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| EXPERIMENTAL STUDY OF BOND-SLIP RELATIONSHIP BETWEEN BOLT AND MORTAR AND THEORETICAL SOLUTION TO FAILURE PROCESS |
| LIU Bo1，2，LI Dongyang1，DUAN Yanfang1，JIN Guangling1，TIAN Ning1 |
| (1. School of Mechanics and Civil Engineering，China University of Mining and Technology，Beijing 100083，China；2. State Key Laboratory of Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Beijing 100083，China) |
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Abstract To research the bond-slip relationship between the bolt and mortar for rock foundation，the pullout test for short bolt in laboratory and uplift test for long bolt in field were carried out respectively. In laboratory，6 kinds of mortar were mixed to analyze the effect of the compressive strength and sand ratio of mortar on bold-slip relationship. Then，the best mix proportion is presented. Based on the local deformation theory，a mathematics model is built，and it can describe the change process of bolt-mortar interface undergoing elastic，plastic softening and slip when the long bolt is subjected to the uplift load. The model was applied to analyzing the field test data. The results show as follows：(1) The effective anchorage depth is a constant value if uplift load is less than elastic ultimate load，or it will increase. (2) The attenuation degree of axis force with depth will slow because the interface plastic softening and cracking occur in top of bolt. Finally，the calculation formula of effective anchorage depth increasing with the increase in uplift load is presented.
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Received: 06 April 2010
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2011, Vol. 30 
