考虑粗糙度和粒径影响的钢-砂界面剪切特性试验研究
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摘要
结构表面粗糙度和土颗粒组成大小对界面的摩擦特性有重要影响,揭示不同介质间界面的力学特性对工程建设具有重要意义。利用改进的直剪仪,对钢板与四组不同粒径组砂粒进行界面剪切试验,研究不同砂粒组、粗糙度和法向应力下的钢-砂界面剪切应力-位移关系、粗糙界面剪切面性状、粗糙界面抗剪强度构成。结果表明:界面峰值剪切应力随法向应力、砂粒组和粗糙度的增大而增加;光面钢板与砂粒在接触表面形成光滑的剪切面,刻纹路部位钢板与砂粒间的剪切面随纹路宽度与粒径的大小而有所不同;粒组粒径不大于刻纹宽度时,在砂-砂间形成剪切面;粒组粒径介于刻纹宽度1~2倍时,可能在砂-砂间形成曲形剪切面,也可能在钢-砂接触部分形成剪切面,粒径远大于刻纹宽度的,形成水平间断剪切面;刻有纹路的抗剪强度由未刻纹路区域与纹路区域提供;界面摩擦角随粒径和粗糙度增大而增加,大致在22°~30°。
Roughness of structural surface and particle size of sand influence significiently the frictional characteristics of structural interface. An improved direct shear apparatus was used to study the interface shear stressdisplacement relationship,including surface charactertistic,roughness and normal stress. The sand with four different particle sizes were used. Test results indicated that the peak values of shear stress increased with normal stress,particle size and interface roughness.The shearing surface between plain steel plate and sands was a smooth horizontal plane. The shearing surface between steel plates cut grains and sands were different with width of grain and ticle sizes. As the width of grain was large than the particle sizes,the shearing surface was a curve between sands. As the width was 1 to 2 times the particle diameter,the shearing surface was alternative a curve between sands or between steel plate and sands.When the particle sizes were much larger than the width,the shearing surface was horizontal discontinuity between sands and steel plate. The shear strength of steel plate engraved surface was composed by cut and uncut areas. The interface friction angle increased with particle size and roughness,the values ranged from 22° to 30°.
Roughness of structural surface and particle size of sand influence significiently the frictional characteristics of structural interface. An improved direct shear apparatus was used to study the interface shear stressdisplacement relationship,including surface charactertistic,roughness and normal stress. The sand with four different particle sizes were used. Test results indicated that the peak values of shear stress increased with normal stress,particle size and interface roughness.The shearing surface between plain steel plate and sands was a smooth horizontal plane. The shearing surface between steel plates cut grains and sands were different with width of grain and ticle sizes. As the width of grain was large than the particle sizes,the shearing surface was a curve between sands. As the width was 1 to 2 times the particle diameter,the shearing surface was alternative a curve between sands or between steel plate and sands.When the particle sizes were much larger than the width,the shearing surface was horizontal discontinuity between sands and steel plate. The shear strength of steel plate engraved surface was composed by cut and uncut areas. The interface friction angle increased with particle size and roughness,the values ranged from 22° to 30°.
引文
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[2]田建勃,韩晓雷,刘江元.砂土与混凝土接触面力学特性大型单剪试验研究[J].工业建筑,2012,42(7):110-114.
[3]蒋劲羽,方琴.不同桩侧粗糙度对桩-土接触面力学特性的影响研究[J].贵州大学学报(自然科学版),2016,33(4):104-107.
[4]肖杰,屈文俊,朱鹏,等.砂土与硫酸腐蚀混凝土接触面剪切试验研究[J].岩土力学,2017,38(9):2613-2620.
[5]胡黎明,濮家骝.土与结构物接触面物理力学特性试验研究[J].岩土工程学报,2001,23(4):431-435.
[6] MORTARA G,FERRARA D,FOTIA G. Simple Model for the Cyclic Behavior of Smooth Sand-Steel Interface[J]. Journal of Geotechnical and Geoenvironmental Engineering,2010,136(7):1004-1009.
[7] TIWARI B,AL-ADHADH A R. Influence of Relative Density on Static Soil-Structure Frictional Resistance of Dry and Saturated Sand[J]. Geotechnical&Geological Engineering,2014,32(2):411-427.
[8] HANSON J,FLORES A,MANHEIM D,et al. Temperature Effects on Sand-Steel Interface Shear and Quantification of PostShear Surface Texture Characteristics of Steel[C]//The International Foundations Congress and Equipment Expo. 2015.
[9] WU X,YANG J. Tests of the Interface Between Structures and Filling Soil of Mountain Area Airport[J]. Geomechanics&Engineering,2017,12(3):399-415.
[10]胡顺洋,李文帅,吴健,等.砂土-钢接触面力学特性的直剪试验研究[J].工业建筑,2018,48(8):118-121,196.
[11]中华人民共和国建设部.土工试验方法标准:GB/T 50123—1999[S].北京:中国建筑工业出版社,1999.
[12]赵志方,赵国藩.采用高压水射法处理新老混凝土黏结面的试验研究[J].大连理工大学学报,1999,39(4):558-561.
[13] CLOUGH G W,DUNCAN J M. Finite Element Analyses of Retaining Wall Behavior[J]. ASCE Soil Mechanics Foundation Division Journal,1973,97(12):1657-1673.