考虑层间效应的钢纤维混凝土隧道单层衬砌受力特征模型试验研究
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摘要
为探究考虑层间接触效应的钢纤维混凝土隧道单层衬砌内力分布规律,自行设计考虑层间效应的单层衬砌模型并研制竖向油压5MPa和侧向压力1.5MPa作为逐级施加的卧式加载试验台架,开展不同荷载作用下的钢纤维混凝土隧道单层衬砌受力特征模型试验。研究结果表明:不考虑层间接触特征的单层衬砌与考虑接触特征的单层衬砌在拱腰和墙角处的安全系数均为最低,最容易出现弯矩和轴力突变;考虑层间接触特征的单层衬砌最大弯矩与最大轴力均出现在拱脚处,层间接触面存在明显黏结力,结构的轴力增加和弯矩减小,内力变得均衡,结构的整体安全性高于不考虑层间接触面,相对不考虑层间效应,受力最不利的左右拱脚处的安全系数分别增加143.7%、149.4%;当竖向油压达到3MPa、侧向油压值达到0.9MPa时,仰拱周围层间接触面压力增长速度显著加快,仰拱处混凝土由线弹性转变为塑性,竖向油压达到4MPa,侧向油压值达到1.2MPa时,仰拱、拱角与拱顶层间接触面应力值有减小或反向增长的趋势,仰拱、墙角等界面发生破坏;钢纤维在单层衬砌裂缝扩展在30%～70%之间阻裂效果最好。
In order to investigate the influence of interlayer contact on the internal force distribution of single-layer lining of steel fiber reinforced concrete tunnel, a single-layer lining model is designed, a horizontal loading test bench with the vertical oil pressure of 5 MPa and the lateral pressure of 1.5 MPa is developed, and the mechanical characteristic model test of single-layer lining of steel fiber reinforced concrete tunnel under different loads is carried out. The results show that both the single-layer linings with and without considering the contact characteristics between the two sides of the arch and the corner have the lowest safety factors, and the sudden changes in bending moment and the axial force are most likely to occur; For the case of the single-layer lining with the contact characteristics of interlayer considered, the maximum bending moment and axial force occur at the arch foot, obvious adhesion exists at the contact surface of interlayer, the axial force increases and bending moment of structure decreases, the internal force becomes balanced, and the overall safety of structure is higher than that without considering the contact surface; compared to the case without considering the interlayer effect,the safety factors at the most dangerous left and right arch feet were increased by 143.7% and 149.4%,respectively; When the vertical oil pressure reaches 3 MPa and the lateral oil pressure reaches 0.9 MPa, the interlayer contact pressure for the inverted arch increases significantly faster, and the concrete of the inverted arch changes from linear elastic state to plastic state; when the vertical oil pressure reaches 4 MPa and the lateral oil pressure reaches 1.2 MPa, the contact stress of inverted arch, arch foot and vault tends to be smaller or to increase reversely, so that the interfaces at the inverted arch and wall corner fail; steel fiber in single-layer lining with crack propagation between 30%～70% has the best crack resistant effect.
In order to investigate the influence of interlayer contact on the internal force distribution of single-layer lining of steel fiber reinforced concrete tunnel, a single-layer lining model is designed, a horizontal loading test bench with the vertical oil pressure of 5 MPa and the lateral pressure of 1.5 MPa is developed, and the mechanical characteristic model test of single-layer lining of steel fiber reinforced concrete tunnel under different loads is carried out. The results show that both the single-layer linings with and without considering the contact characteristics between the two sides of the arch and the corner have the lowest safety factors, and the sudden changes in bending moment and the axial force are most likely to occur; For the case of the single-layer lining with the contact characteristics of interlayer considered, the maximum bending moment and axial force occur at the arch foot, obvious adhesion exists at the contact surface of interlayer, the axial force increases and bending moment of structure decreases, the internal force becomes balanced, and the overall safety of structure is higher than that without considering the contact surface; compared to the case without considering the interlayer effect,the safety factors at the most dangerous left and right arch feet were increased by 143.7% and 149.4%,respectively; When the vertical oil pressure reaches 3 MPa and the lateral oil pressure reaches 0.9 MPa, the interlayer contact pressure for the inverted arch increases significantly faster, and the concrete of the inverted arch changes from linear elastic state to plastic state; when the vertical oil pressure reaches 4 MPa and the lateral oil pressure reaches 1.2 MPa, the contact stress of inverted arch, arch foot and vault tends to be smaller or to increase reversely, so that the interfaces at the inverted arch and wall corner fail; steel fiber in single-layer lining with crack propagation between 30%～70% has the best crack resistant effect.
引文
[1]康亚明,刘长武,韩小刚,等.钢纤维几何尺寸对钢纤维混凝土损伤变形特性的影响[J].土木工程学报,2010,43(4):119-124(Kang Yaming,Liu Changwu,Han Xiaogang,et al.A study of the damage and deformation characteristics of steel fiber reinforced concrete with different steel fiber reinforced concrete with different steel fiber sizes[J].China Civil Engineering Journal,2010,43(4):119-124(in Chinese))
[2]朱海堂,高丹盈,汤寄予.钢纤维高强混凝土的强度指标及其相互关系[J].建筑材料学报,2009,12(3):323-327(Zhu Haitang,Gao Danying,Tang Jiyu.Strength indexes of steel fiber reinforced high strength concrete and their interrelations[J].Journal of Building Materials,2009,12(3):323-327(in Chinese))
[3]高丹盈,史科,赵顺波.基于软化拉压杆模型的钢筋钢纤维混凝土梁柱节点受剪承载力计算方法[J].土木工程学报,2014,47(9):101-109(Gao Danying,Shi Ke,Zhao Shunbo.Calculation method for shear capacity of steel fiber reinforced concrete beam-column joints based on softened strut-and-tie model[J].China Civil Engineering Journal,2014,47(9):101-109(in Chinese))
[4]韩菊红,高丹盈,丁自强.钢纤维混凝土替代构造配筋混凝土梁受弯性能试验研究[J].土木工程学报,2006,39(8):33-37(Han Juhong,Gao Danying,Ding Ziqiang.An experimental study on the flexural performances of SFRC beams replacing composition RCbeams[J].China Civil Engineering Journal,2006,39(8):33-37(in Chinese))
[5]孔宪京,屈永倩,邹德高,等.钢纤维混凝土面板堆石坝的抗震性能数值分析[J].水利学报,2016,47(7):841-849(Kong Xianjing,Qu Yongqian,Zou Degao,et al.Numerical analysis of seismic performance of steel fiber reinforced concrete face rockfill dam[J].Journal of Hydraulic Engineering,2016,47(7):841-849(in Chinese))
[6]侯利军,刘泓,徐世烺,等.锈蚀钢筋与钢纤维混凝土的黏结性能试验研究[J].建筑结构学报,2017,38(7):146-155(Hou Lijun,Liu Hong,Xu Shilang,et al.Experimental study on bond behavior corroded rebar and steel rebar reinforced concrete[J].Journal of Building Structures,2017,38(7):146-155(in Chinese))
[7]崔光耀,王道远,倪嵩陟,等.软弱围岩隧道钢纤维混凝土衬砌承载特性模型试验研究[J].岩土工程学报,2017,39(10):1807-1813(Cui Guangyao,Wang Daoyuan,Ni Songzhi,et al.Model test study of steel fiber concrete lining bear characteristic of weak surrounding rock tunnel[J].Chinese Journal of Geotechnical Engineering,2017,39(10):1807-1813(in Chinese))
[8]赵顺波,杜晖,钱晓军,等.钢纤维高强混凝土配合比直接设计方法研究[J].土木工程学报,2008,41(7):1-6(Zhao Shunbo,Du Hui,Qian Xiaojun,et al.Study on direct mix design method for steel fiber reinforced high-strengh concrete[J].China Civil Engineering Journal,2008,41(7):1-6(in Chinese))
[9]韩嵘,赵顺波,曲福来.钢纤维混凝土抗拉性能试验研究[J].土木工程学报,2006,39(11):63-67(Han Rong,Zhao Shunbo,Qu Fulai.Experimental study on the tensile performance of steel fiber reinforced concrete[J].China Civil Engineering Journal,2006,39(11):63-67(in Chinese))
[10]丁一宁,刘思国.钢纤维自密实混凝土弯曲韧性和剪切韧性试验研究[J].土木工程学报,2010,43(11):55-63(Ding Yining,Liu Siguo.Study of the flexural and shear toughness of steel fiber reinforced self-compacting concrete[J].China Civil Engineering Journal,2010,43(11):55-63(in Chinese))
[11]刘新荣,祝云华,李晓红,等.隧道钢纤维喷射混凝土单层衬砌试验研究[J].岩土力学,2009,30(8):2319-2323(Liu Xinrong,Zhu Yunhua,Li Xiaohong,et al.Experimental research on single-layer tunnel lining of steel fiber shotcrete[J].Rock and Soil Mechanics,2009,30(8):2319-2323(in Chinese))
[12]杜国平,刘新荣,祝云华,等.隧道钢纤维喷射混凝土性能试验及其工程应用[J].岩石力学与工程学报,2008,27(7):1448-1454(Du Guoping,Liu Xinrong,Zhu Yunhua,et al.Performance examination of steel fiber reinforced shotcrete in tunnel and ITS engineering application[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(7):1448-1454(in Chinese))
[13]王家滨,牛荻涛,张永利.喷射混凝土力学性能?渗透性及耐久性试验研究[J].土木工程学报,2016,49(5):96-109(Wang Jiabin,Niu Ditao,Zhang Yongli.Investigation of mechanical,permeability and durability performance of shotcrete with and without steel fiber[J].China Civil Engineering Journal,2016,49(5):96-109(in Chinese))
[14]Jeng F S,Lin M L,Yuan S C.Performance of toughness indices for steel fiber reinforced shotcrete[J].Tunneling and Underground Space Technology,2002,17(1):69-82
[15]Lee S,Kim D.An experimental study on the durability of high performance shotcrete for permanent tunnel support[J].Tunneling and Underground Space Technology,2004,21(3/4):998-1004
[2]朱海堂,高丹盈,汤寄予.钢纤维高强混凝土的强度指标及其相互关系[J].建筑材料学报,2009,12(3):323-327(Zhu Haitang,Gao Danying,Tang Jiyu.Strength indexes of steel fiber reinforced high strength concrete and their interrelations[J].Journal of Building Materials,2009,12(3):323-327(in Chinese))
[3]高丹盈,史科,赵顺波.基于软化拉压杆模型的钢筋钢纤维混凝土梁柱节点受剪承载力计算方法[J].土木工程学报,2014,47(9):101-109(Gao Danying,Shi Ke,Zhao Shunbo.Calculation method for shear capacity of steel fiber reinforced concrete beam-column joints based on softened strut-and-tie model[J].China Civil Engineering Journal,2014,47(9):101-109(in Chinese))
[4]韩菊红,高丹盈,丁自强.钢纤维混凝土替代构造配筋混凝土梁受弯性能试验研究[J].土木工程学报,2006,39(8):33-37(Han Juhong,Gao Danying,Ding Ziqiang.An experimental study on the flexural performances of SFRC beams replacing composition RCbeams[J].China Civil Engineering Journal,2006,39(8):33-37(in Chinese))
[5]孔宪京,屈永倩,邹德高,等.钢纤维混凝土面板堆石坝的抗震性能数值分析[J].水利学报,2016,47(7):841-849(Kong Xianjing,Qu Yongqian,Zou Degao,et al.Numerical analysis of seismic performance of steel fiber reinforced concrete face rockfill dam[J].Journal of Hydraulic Engineering,2016,47(7):841-849(in Chinese))
[6]侯利军,刘泓,徐世烺,等.锈蚀钢筋与钢纤维混凝土的黏结性能试验研究[J].建筑结构学报,2017,38(7):146-155(Hou Lijun,Liu Hong,Xu Shilang,et al.Experimental study on bond behavior corroded rebar and steel rebar reinforced concrete[J].Journal of Building Structures,2017,38(7):146-155(in Chinese))
[7]崔光耀,王道远,倪嵩陟,等.软弱围岩隧道钢纤维混凝土衬砌承载特性模型试验研究[J].岩土工程学报,2017,39(10):1807-1813(Cui Guangyao,Wang Daoyuan,Ni Songzhi,et al.Model test study of steel fiber concrete lining bear characteristic of weak surrounding rock tunnel[J].Chinese Journal of Geotechnical Engineering,2017,39(10):1807-1813(in Chinese))
[8]赵顺波,杜晖,钱晓军,等.钢纤维高强混凝土配合比直接设计方法研究[J].土木工程学报,2008,41(7):1-6(Zhao Shunbo,Du Hui,Qian Xiaojun,et al.Study on direct mix design method for steel fiber reinforced high-strengh concrete[J].China Civil Engineering Journal,2008,41(7):1-6(in Chinese))
[9]韩嵘,赵顺波,曲福来.钢纤维混凝土抗拉性能试验研究[J].土木工程学报,2006,39(11):63-67(Han Rong,Zhao Shunbo,Qu Fulai.Experimental study on the tensile performance of steel fiber reinforced concrete[J].China Civil Engineering Journal,2006,39(11):63-67(in Chinese))
[10]丁一宁,刘思国.钢纤维自密实混凝土弯曲韧性和剪切韧性试验研究[J].土木工程学报,2010,43(11):55-63(Ding Yining,Liu Siguo.Study of the flexural and shear toughness of steel fiber reinforced self-compacting concrete[J].China Civil Engineering Journal,2010,43(11):55-63(in Chinese))
[11]刘新荣,祝云华,李晓红,等.隧道钢纤维喷射混凝土单层衬砌试验研究[J].岩土力学,2009,30(8):2319-2323(Liu Xinrong,Zhu Yunhua,Li Xiaohong,et al.Experimental research on single-layer tunnel lining of steel fiber shotcrete[J].Rock and Soil Mechanics,2009,30(8):2319-2323(in Chinese))
[12]杜国平,刘新荣,祝云华,等.隧道钢纤维喷射混凝土性能试验及其工程应用[J].岩石力学与工程学报,2008,27(7):1448-1454(Du Guoping,Liu Xinrong,Zhu Yunhua,et al.Performance examination of steel fiber reinforced shotcrete in tunnel and ITS engineering application[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(7):1448-1454(in Chinese))
[13]王家滨,牛荻涛,张永利.喷射混凝土力学性能?渗透性及耐久性试验研究[J].土木工程学报,2016,49(5):96-109(Wang Jiabin,Niu Ditao,Zhang Yongli.Investigation of mechanical,permeability and durability performance of shotcrete with and without steel fiber[J].China Civil Engineering Journal,2016,49(5):96-109(in Chinese))
[14]Jeng F S,Lin M L,Yuan S C.Performance of toughness indices for steel fiber reinforced shotcrete[J].Tunneling and Underground Space Technology,2002,17(1):69-82
[15]Lee S,Kim D.An experimental study on the durability of high performance shotcrete for permanent tunnel support[J].Tunneling and Underground Space Technology,2004,21(3/4):998-1004