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| Large scale model test on the distribution characteristics of the prestressed field of end-anchored bolts |
| LIN Jian1，2，3，SHI Yao1，2，3，SUN Zhiyong1，2，3，WANG Zhengsheng1，2，3，CAI Jiafang1，2，3 |
| (1. Coal Mining and Designing Department，Tiandi Science and Technology Co.，Ltd.，Beijing 100013，China；2. Coal Mining and Designing Branch，China Coal Research Institute，Beijing 100013，China；3. State Key Laboratory of Coal Resource High-efficiency Mining and Clean Utilization，China Coal Research Institute，Beijing 100013，China) |
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Abstract A large scale field test bench for prestressed bolt was manufactured to study the distribution characteristics of the prestressed field around the end-anchored bolt. The results show that the distribution pattern of the prestressed field of a single anchor is similar to the shape of pomegranate. The stress contour surfaces vary gradually from dense to sparse，the stress values descend gradually and the distribution ranges enlarge gradually. Two concentration zones of compressive stresses form in the rock in the vicinity of the anchorage and a concentration zone of tensile stress forms near the anchor head. The distribution of the stress along the axis of the bolt is related to the distance between the measuring line and the anchor bolt. The variation of the stress along the horizontal direction is related to the distance between the measuring line and the surface of the model. Although the pre-loads are different，the stress field distributions are basically the same，but the distribution ranges of the stress contour surfaces change significantly.
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2016, Vol. 35 
