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| TESTING STUDY OF CHANGING LAW OF ANCHORING
FORCE UNDER DIFFERENT LATERAL PRESSURE COEFFICIENTS |
| ZHA Wenhua1，2，WANG Xiaopo1，2，SHI Chong3，LIU Chunsheng4 |
| (1. Provincal and MOE Joint Established Key Laboratory of Mine Safety and High Efficient Mining，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. School of Energy and Safety，Anhui University of Science and Technology，Huainan，Anhui 232001，China；3. Institute of Geotechnical Engineering，Hohai University，Nanjing，Jiangsu 210098，China；4. Wuhan Conourish Engineering Exploration Technology Development Co.，Ltd.，Wuhan，Hubei 430312，China) |
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Abstract In order to research the invalidation mode of anchor bolt and the changing rule of anchoring force under different lateral pressure coefficients，pull-out tests were performed. The results show that：it was dominated by losing binding between anchor bolt with anchor layer interface accompanying that breaking of anchor layer and also losing binding between anchor layer with drilling hole wall，and the largest load force enlarged with the lateral pressure coefficients increase，when the coefficient reach 1.3，the largest load force of anchor blot was received，after that it was decreased by lateral pressure coefficients increased. The elastic deformation zone，plastic slip deformation zone and the losing binding deformation zone were emerged one after another on binding interface with anchor damaged. The friction force was enhanced by radial load on slip deformation zone between anchor bolt and anchor layer interface and then the largest pull-out load was increased.
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Received: 22 May 2013
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2013, Vol. 32 
