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《Journal of Henan Polytechnic University(Natural Science)》 2008-05
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Study on creep characters of anchorage body in soft rock tunnel

WEISi-jiang1,MAJian-hong2,SUNGuang-zhong3(1.School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;2.Office of Science and Technology,Henan Polytechnic University,Jiaozuo 454003,China;3.Department of Safety Engineering,Henan Technic College,Zhengzhou 451191,China)  
Creep is a key factor to the application of bolts in weak rock.The creep rule of anchorage body was studied in soft rock under different stress level,by means of analogue experiment.Soft rock was analogue by the mixture of wax,sand and vansline,bolt by fuse and resign by gypsum.Step loading was applied.Based on experimental results,creep regular patterns and expirical formula were obtained in different stress level.The creep character was described in Burgers model,then creep mechanical function deduced.According to creep expirical foumula,the raitional support time is 1000 to 1500 minutes when stress level is 1.1 times by using viscid and elastic analyses.
【Fund】: 国家安全生产科技计划项目(07-148);; 河南理工大学青年基金项目(Q2006-9)
【CateGory Index】: TD353
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