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| Insitu test on bond fatigue characteristics of bolts for reinforcing soft shaly sandstone slopes |
| LI Guowei1，2，HE Xinrong3，WU Jiantao2，CHEN Wei3，XIONG Li3，CAO Xueshan2 |
(1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering，Hohai University，Nanjing，Jiangsu 210098，China；2. Highway and Railway Research Institute，Hohai University，Nanjing，Jiangsu 210098，China；3. Geotechnical Research Institute，Hohai University，Nanjing，Jiangsu 210098，China)
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Abstract Steel bolts were used to reinforce the underwater soft rock slope of the Yangtze River-to-Huaihe River canal project. In order to study the influence of existing detection methods on the bonding state of steel bolts in soft rocks，insitu test was carried out. The results show that the effective anchoring depth increases with increasing the load exerted on the bolt. The degree of bond damage at the interface of the bolt body is positively correlated with the magnitude of the load，and compared with the load，the loading number has minimal effect on bond damage. Longer loading time of incremental graded load will result in greater increment of the elastic elongation of the bolt under the same magnitude of the load，indicating that the degree of bond damage at the interface of the bolt body is positively correlated with the time during which the graded load is maintained. The plastic displacement at the end of the bolt is generated during the unloading process，which comes from the relative displacement at the interface between the bond body and surrounding rock and is mainly affected by the method of unloading. The faster the unloading speed is，the greater the plastic displacement is. The plastic displacement is positively correlated with the time during which the incremental graded load is maintained. Combining four different detection methods for the bond damage characteristics，a more scientific testing method for detecting the anchoring state of reinforcement bolts in soft shaly sandstone was proposed.
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2020, Vol. 39 
