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In-situ measure to internal stress of shotcrete layer in soft-rock roadway

查看全文 作　　者：Shulin [1,2]Fang;Jian [1,2]Zhang 高影响力作者 机构地区：[1]Coal Mining and Design Branch,China Coal Research Institute,Beijing 100013,China;[2]Mining&Designing Department,Tiandi Science&Technology Co.,Ltd,Beijing 100013,China高影响力机构 出　　处：《International Journal of Coal Science & Technology》索引2014年第1卷第3期,共8页高影响力期刊 摘　　要：In order to solve the difficult conditions of soft rock,water-trickling and hard-maintain of main air-return roadway in Tarangaole Colliery,high pretensioned stress and intensive bolt-shotcrete support program was designed and mechanical property of shotcrete layer was specially monitored through utilizing a type of concrete stress meter with oscillating chord after the program was carried out.It was indicated that,due to rock pressure and support resistance,the interior of shotcrete layer would emerge diverse stresses in axial,radial and tangential directions.With time passing internal stresses in three directions,whose average values were-0.061,0.043 and 0.517 MPa respectively,fluctuated first and then tended to stability slowly.The axial and radial stresses were relatively smaller than tangential stress which was 11,12 times the two formers respectively.Along the section of roadway,axial and tangential stresses distributed symmetrically and increased gradually from the top of arch to the waist of wall,but reduced at the foot of wall.Radial stresses reduced from the top of arch to the waist of arch first,and then increased in the waist of wall.Axial stresses were tensile substantially,except for stresses in arch vault tending to compressive,but all the radial stresses were compressive.Nevertheless,tangential stresses in the wall were compressive and tangential stresses in the arch were tensile.During the period of roadway excavating,the stress of shotcrete layer was less than its ultimate bearing capacity,with no significant stress concentration.At the end of this article,some suggests are given to shotcrete support design. 关 键 词：Soft-rock roadway Shotcrete layer Intemal stress measure Oscillating-chord stress meter
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