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| EXPERIMENTAL STUDY OF CRACK PREVENTION EFFECT OF PRE-STRESSED BOLT ANCHORING |
| ZHOU Hui1，XU Rongchao2，ZHANG Chuanqing1，SHEN Zheng1，MENG Fanzhen1，LIU Haitao1 |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. College of Resources and Environment，North China University of Water Resources and Electric Power，Zhengzhou，Henan 450011，China) |
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Abstract Specimens with different angles of pre-existing fissures were made using the high-strength gypsum. The anchoring effect of the pre-stressed bolt on crack prevention was studied under uniaxial compression. The results showed that the elastic modulus，the crack initiation strength，the peak strength and the residual strength of anchored specimens increased to certain extent and increased with the increase of the pre-stress in bolt. The anchoring effect with the angle of 45 degree was more obvious than that of 30 degree and 60 degree. The pre-stressed bolt not only effectively restrained the separation of the failure planes of wing crack but also changed the expansion modes of the secondary crack. The change of the axial stress of bolt during the deformation of specimens was divided into four stages：the slow growth stage，the rapid growth stage，the sharp rising stage and the decelerated growth stage. The peak value of axial stress increased with the improvement of pre-stress of bolt. The anchoring mechanisms were analyzed with the theory of fracture mechanics. The role of the pre-stressed bolt played before peak strength was axial pressure and after peak strength was a combination of anti-shearing and axial pressure.
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2015, Vol. 34 
