Abstract：To deal with the problems associated with rock bolt materials in the coal mines，the complete support technology using prestressed steel bars，including steel bar material，locking device，component，anchoring method，machinery and procedure，was developed，based on numerical models，laboratory and field tests；according to laboratory tests，the yield strength of steel bars is not less than 1 140 MPa，the tensile strength is not less than 1 270 MPa，the extension ratio is more than 15%，the impacting absorbing energy is not less than 30 J，and the plates and locking devices compatible with the steel bar strength are developed. Numerical models are used to analyze the distribution characteristics of the stress field caused by steel bars，as well as the main affecting factors，under high prestressed conditions，the magnitude of the stress field caused by steel bars are big，the scope of compressive stress is widely spread，and the active support performance of steel bars is obvious. Field support trials using prestressed steel bars were carried out in the water-discharging roadway of Zhangcun coal mine，Luan coalfield，the displacements of roadways are moderate，no roof separation is shown，the pre-tensioned force is 100–120 kN，the force of steel bars is stable and not affected by the roadway development，and the support performance is good. The cost of using steel bars is less than that of using high strength rock bolts by 29.5%，the spacing of steel bars is big，the installation of pre-tensioned force is fast，the speed of roadway development can be improved to some extent，and this support technology is deserved to be promoted.
张 农，高明仕. 煤巷高强预应力锚杆支护技术与应用[J]. 中国矿业大学学报，2004，33(5)：524-527.(ZHANG Nong，GAO Mingshi. High Strength and pretension bolting support of coal roadway and its application[J]. Journal of China University Mining and Technology， 2004，33(5)：524-527.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
[10]
康红普，林 健，张冰川. 小孔径预应力锚索加固困难巷道的研究与实践[J]. 岩石力学与工程学报，2003，22(3)：387-390.(KANG Hongpu，LIN Jian，ZHANG Bingchuan. Study on small borehole pretensioned cable reinforcing complicated roadway[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(3)：387-390.(in Chinese))
康红普，王金华，林 健. 高预应力强力支护系统及其在深部巷道中的应用[J]. 煤炭学报，2007，32 (12)：1 233-1 238.(KANG Hongpu，WANG Jinghua，LIN Jian. High pretensioned stress and intensive bolting system and its application in deep roadways[J]. Journal of China Coal Society，2007，32(12)：1 233-1 238.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
[11]
吴志祥，赵英利，梁建军，等. 预应力注浆锚索技术在加固大巷中的应用[J]. 煤炭科学技术，2001，29(8)：10-12.(WU Zhixiang，ZHAO Yingli，LIANG Jianjun，et al. Pre-stressed grout bolting technology applied to reinforcement of mine large cross section roadway[J]. Coal Science and Technology，2001，29(8)：10-12.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
郑雨天，朱浮声. 预应力锚杆体系—锚杆支护技术发展的新阶段[J]. 矿山压力与顶板管理，1995，(1)：2-7.(ZHENG Yutian，ZHU Fusheng. Prestressed anchor system bolt support technology of a new stage of development[J]. Ground Pressure and Strata Control，1995，(1)：2-7.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
[9]
曹晨明，吴拥政. 高预紧力强力支护系统及其在潞安矿区的应用研究[J]. 煤炭科学技术，2008，36(11)：26-29.(CAO Chenming，WU Yongzheng. High pre-stressed support system and application in Luan Mining Area[J]. Coal Science and Technology，2008，36(11)：26-29.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
[4]
康红普，姜铁明，高富强. 预应力在锚杆支护中的作用[J]. 煤炭学报，2007，32(7)：680-685.(KANG Hongpu，JIANG Tieming，GAO Fuqiang. Effect of pretensioned stress to rock bolting[J]. Journal of China Coal Society，2007，32(7)：680-685.(in Chinese))
[8]
吴拥政. 强动压下回采巷道高预紧力强力锚杆支护技术研究[J]. 煤炭科学技术，2010，38(3)：12-15.(WU Yongzheng. High pre-tension powerful bolt support technology for mining gateway under high mining-induced pressure[J]. Coal Science and Technology，2010，38(3)：12-15.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
[14]
王 强，吴拥政. 煤矿井下锚杆预紧力控制研究[J]. 煤炭科学技术，2011，39(1)：29-32.(WANG Qiang，WU Yongzheng. Study on bolt pre-tension control in underground mine[J]. Coal Science and Technology，2011，39(1)：29-32.(in Chinese))
[18]
吴建星. 锚杆托板的合理结构与支护效果研究[硕士学位论文][D]. 北京：煤炭科学研究总院，2009.(WU Jianxing. Study on the rational structure and supporting effect of rock bolt plate[M. S. Thesis][D]. Beijing：China Coal Research Institute，2009.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
邓素怀，赵海凤，孔祥涛，等. 较大直径预应力钢棒的热处理工艺[J]. 金属热处理，2011，36(2)：88-90.(DENG Suhuai，ZHAO Haifeng， KONG Xiangtao，et al. Heat Treatment process of relatively larger diameter PC steel bar[J]. Heat Treatment of Metals，2011，36(2)：88-90.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
2015, Vol. 34 
