热处理高强钢筋格栅在隧道工程应用的试验研究
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摘要
热处理高强钢筋具有高强度、延展性能优越、强屈比高、焊接与冷弯性能优越等诸多优点,能够有效降低工程中钢筋的用量、提高工程质量,在国内外许多工程中得到了成功的应用,但是在隧道工程中的应用刚刚起步。结合铁路、公路隧道工程建设,开展热处理高强钢筋格栅应用的现场试验研究,对比分析高强钢筋格栅与原设计的I20b型钢拱架的支护性能。试验结果表明,格栅拱架试验段相比I20b型钢拱架试验段的沉降收敛减少约7%～30%,围岩压力相差不多,但格栅拱架应力略高。由于格栅与混凝土的粘结性更好,格栅+喷混凝土的最终承载能力大于型钢+喷混凝土,且格栅拱架的钢材用量比I20b型钢拱架的用钢量节约36%,具有显著的经济和社会效益。
The heat treated-high strength steel bar have many advantages,such as high strength,good ductility,high strength ratio,good welding and cold bending performance,etc. It could effectively reduce the amount of steel bars and improve the project quality,and was successfully applied in civil engineering at home and abroad. However,the application of heat treated-high strength steel bar has limited study in the tunnel engineering. Based on the railway and highway tunnel construction,field tests of heat treatment high-strength lattice girders was carried out. By comparing the results,the supporting performance of high-strength lattice girders and I20b steel was analyzed. The result showed that settlement and convergence between high-strength lattice girders test section and I20b steel was reduced 7% ～ 30%,and the surrounding rock pressure was close. But the steel stress of high-strength lattice girders was higher than I20b steel. Because of better combination between lattice girders and shotcrete,high-strength lattice girders ultimate bearing capacity was bigger than I20b steel,and steel material consumption of high-strength lattice girders was about 36% less than I20b steel. So high-strength lattice girders had good social and economic efficiency.
The heat treated-high strength steel bar have many advantages,such as high strength,good ductility,high strength ratio,good welding and cold bending performance,etc. It could effectively reduce the amount of steel bars and improve the project quality,and was successfully applied in civil engineering at home and abroad. However,the application of heat treated-high strength steel bar has limited study in the tunnel engineering. Based on the railway and highway tunnel construction,field tests of heat treatment high-strength lattice girders was carried out. By comparing the results,the supporting performance of high-strength lattice girders and I20b steel was analyzed. The result showed that settlement and convergence between high-strength lattice girders test section and I20b steel was reduced 7% ～ 30%,and the surrounding rock pressure was close. But the steel stress of high-strength lattice girders was higher than I20b steel. Because of better combination between lattice girders and shotcrete,high-strength lattice girders ultimate bearing capacity was bigger than I20b steel,and steel material consumption of high-strength lattice girders was about 36% less than I20b steel. So high-strength lattice girders had good social and economic efficiency.
引文
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[2]高策,林辉,徐升桥.铁路桥梁工程应用高强钢筋经济性分析[J].铁道标准设计,2018,62(8):59-63.GAO Ce,LIN Hui,XU shengqiao.Economic analysis of high-strength bars in railw ay bridge engineering Application[J].Railw ay Standard Design,2018,62(8):59-63.
[3]杜毛毛.高强钢筋在混凝土结构中的应用评价[J].混凝土,2012(9):121-122,125.DU M aomao.Comment on the application of highstrength steel bars in concrete structures[J].Concrete,2012(9):121-122,125.
[4]于富才,张顶立,房倩,等.高强钢筋格栅混凝土复合支护特性的试验研究[J].土木工程学报,2015,48(9):104-111.YU Fucai,ZHANG Dingli,FANG Qian,et al.Experimental study on characteristics of composite support w ith high-strength reinforcing lattice girders embedded in concrete[J].China Civil Engineering Journal,2015,48(9):104-111.
[5]关宝树.漫谈矿山法隧道技术第四讲-钢架[J].隧道建设,2016,36(2):123-130.GUAN Baoshu.Tunneling by mining method:lectureⅣ:steel arch[J].Tunnel Construction,2016,36(2):123-130.
[6]曲海峰,朱合华,黄成造.隧道初期支护的钢拱架与钢格栅选择研究[J].地下空间与工程学报,2005,3(2):258-262.QU Haifeng,ZHU Hehua,HUANG Chengzao.Study on selection of section-steel and grid-steel in primary support system of tunnel[J].Chinese Journal of Underground Space and Engineering,2005,3(2):258-262.
[7]谭忠盛,喻渝,王明年,等.大断面黄土隧道中型钢与格栅适应性的对比试验[J].岩土工程学报,2009,31(4):628-633.TAN Zhongsheng,YU Yu,WANG M ingnian,et al.Comparative tests on section steel and steel grid for loess tunnels w ith large section[J].Chinese Journal of Geotechnical Engineering,2009,31(4):628-633.
[8]陈中学,胡百万,李信臻,等.拱架在隧道初期支护中的效果研究[J].施工技术,2012,41(增刊2):29-31CHEN Zhongxue,HU Baiw an,LI Xinzhen,et al.Study on effect of steel framew ork in tunnel preliminary bracing[J].Construction Technology,2012,41(Suppl.2):29-31.
[9]李洪泉,杨成永,徐明新,等.隧道格栅拱架喷射混凝土支护安全性评价[J].岩石力学与工程学报,2009,28(增刊2):3903-3908.LI Hongquan,YANG Chengyong,XU M ingxin,et al.Assessment on safety of lattice girder reinforced shotcrete support for tunnels[J].Chinese Journal of Rock M echanicas and Engineering,2009,28(Suppl.2):3903-3908.
[10]KOMSELIS C,BLAYNEY N,HINDLE D.The use of lattice girders in the construction of tunnels[J].The M asterbuilder,2012,14(4):88-94.
[11]KIM S,HAN T H,BAEK J S,et al.Evaluation of the structural performance of tetragonal lattice girders[J].International Journal of Steel Structures,2013,13(1):31-47.
[12]NOMIKOS P P,SOFIANOS A I,SAKKAS K M,et al.Nonlinear simulation of lattice girder segment tests[J].Tunnelling and Underground Space Technology,2013,38:180-188.
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[14]丁远振,谭忠盛,马栋,等.高强钢筋格栅在Ⅳ级围岩隧道中的支护效果研究[J].土木工程学报,2017,50(增刊2):98-103.DING Yuanzhen,TAN Zhongsheng,M A Dong,et al.Study on support effect of high-strength steel grille in tunnel w ithⅣgrade surrounding rock[J].China Civil Engineering Journal,2017,50(Suppl.2):98-103.
[15]马栋,谭忠盛,丁远振,等.高强钢筋格栅在Ⅴ级围岩隧道中的支护效果研究[J].土木工程学报,2017,50(增刊2):14-20.M A Dong,TAN Zhongsheng,DING Yuanzhen,et al.Study on support effect of high-strength steel grille in tunnel w ithⅤgrade surrounding rock[J].China Civil Engineering Journal,2017,50(Suppl.2):14-20.
[16]王梦恕.中国隧道及地下工程修建技术[M].北京:人民交通出版社,2010.