剪切速率对黏性土混凝土界面抗剪强度影响的试验研究
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摘要
通过自行研制的大型恒刚度桩土界面直剪仪,进行6种剪切速率的黏性土混凝土界面剪切试验,探讨剪切速率对黏性土混凝土界面抗剪强度的影响规律。结果表明:在黏性土混凝土界面,超孔隙水压力随着剪切速率的提高而增大;法向应力和剪切速率通过影响超孔隙水压力大小,决定黏性土混凝土界面剪切峰值强度和剪切破坏位移的大小;剪应力剪切位移关系曲线由基本一致变化到一定范围内产生偏离,且法向应力和剪切速率越大偏离越显著,并出现明显的应变软化现象;剪切速率从0.4mm/min增加至5.0mm/min,黏性土混凝土界面抗剪强度减小幅度增大,摩擦系数减小0.1,有效黏着力的变化介于0.81～5.93kPa之间。
The direct shear tests of clayey soil-concrete interface with six series of shear rates were carried out by using the self-developed large-scale constant normal stiffness pile-soil interface shear apparatus.The effect of shear rate on shear strength of clayey soil-concrete interface was explored in this paper.The test results indicate that excess pore water pressure increases with the increased shear rate.The excess pore water pressure is influenced by both normal stress and shear rate,which is closely related to shear peak strength and shear failure strain of clayey soil-concrete interface.The shear stress-shear strain curves are basically identical at the beginning and then deviate in a certain range,which deviate the more obviously and present significant strain-softening appearing,with higher normal stress and faster shear rate.The decreased magnitude on shear strength of clayey soil-concrete interface increases,and the friction coefficient decreases to 0.1 and the effective adhesive force varies from 0.81 kPa to 5.93 kPa as the shear rate increases from 0.4 mm/min to 5.0 mm/min.
The direct shear tests of clayey soil-concrete interface with six series of shear rates were carried out by using the self-developed large-scale constant normal stiffness pile-soil interface shear apparatus.The effect of shear rate on shear strength of clayey soil-concrete interface was explored in this paper.The test results indicate that excess pore water pressure increases with the increased shear rate.The excess pore water pressure is influenced by both normal stress and shear rate,which is closely related to shear peak strength and shear failure strain of clayey soil-concrete interface.The shear stress-shear strain curves are basically identical at the beginning and then deviate in a certain range,which deviate the more obviously and present significant strain-softening appearing,with higher normal stress and faster shear rate.The decreased magnitude on shear strength of clayey soil-concrete interface increases,and the friction coefficient decreases to 0.1 and the effective adhesive force varies from 0.81 kPa to 5.93 kPa as the shear rate increases from 0.4 mm/min to 5.0 mm/min.
引文
[1]BASUDHAR P K.Modeling of soil-woven geotextile interface behavior from direct shear test results[J].Geotextiles and Geomembranes,2010,28(4):403-408.
[2]LIU H B,SONGE X,LING H I.Constitutive modeling of soil-structure interface through the concept of critical state soil mechanics[J].Mechanics Research Communications,2006,33(4):515-531.
[3]刘方成,尚守平,王海东.粉质黏土-混凝土接触面特性单剪试验研究[J].岩石力学与工程学报,2011,30(8):1720-1728.LIU F C,SHANG S P,WANG H D.Study of shear properties of silty clay-concrete interface by simple shear tests[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(8):1720-1728.(in Chinese)
[4]肖成志,冯晓静.土工格栅-黏性土界面特性的拉拔试验分析[J].土木建筑与环境工程,2012,34(3):47-51.XIAO C Z,FENG X J.Pullout-test analysis on properties of interface between geogrid and clay[J].Journal of Civil,Architectural&Environmental Engineering,2012,34(3):47-51.(in Chinese)
[5]RICHARD P J,TUNCER B E,PETER J R,et al.Effect of particle shape on interface behavior of demsimulated granular materials[J].The International Journal of Geomechanics,2001,1(1):1-19.
[6]王伟,卢廷浩,周爱兆.土与混凝土接触面反向单剪本构模型[J].土木建筑与环境工程,2011,33(2):1303-1306.WANG W,LU T H,ZHOU A Z.Constitutive model for negative simple-sheared soil concrete interface[J].Journal of Civil,Architectural&Environmental Engineering,2011,33(2):1303-1306.(in Chinese)
[7]GOMEZ J E,FILZ G M,EBELING R M,et al.Sandto-concrete interface response to complex load paths in a large displacement shear box[J].Geotechnical Testing Journal,2008,31(4):358-369.
[8]HU L M,PU J L.Testing and modeling of soilstructure interface[J].Journal of Geotechnical and Geoenvironmental Engineering,2004,130(8):851-860.
[9]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):431-435HU L M,PU J L.Experimental study onmechanical characteristics of soil-structure interface[J].Chinese Journal of Geotechnical Engineering,2001,23(4):431-435.(in Chinese)
[10]张嘎,张建民.大型土与结构接触面循环加载剪切仪的研制及应用[J].岩土工程学报,2003,25(2):149-153.ZHANG G,ZHANG J M.Development and application of a cyclic shear apparatus for soil-structure interface[J].Chinese Journal of Geotechnical Engineering,2003,25(2):149-153.(in Chinese)
[11]龚辉,赵春风,陶帼雄,等.应力历史对黏土-混凝土界面剪切特性的影响研究[J].岩石力学与工程学报,2011,30(8):1712-1719.GONG H,ZHAO C F,TAO G X,et al.Research on effect of stress history on shear behabior of interface between clay and concrete[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(8):1712-1719.(in Chinese)
[12]陈俊桦,张家生,李键.接触面粗糙度对红黏土-混凝土接触面力学特性的影响[J].中南大学学报(自然科学版),2016,47(5):1682-1688.CHEN J H,ZHANG J S,LI J.Influence of interface roughness on mechanical properties of red clay-concrete interface[J].Chinese Journal of Rock Mechanics and Engineering,2016,47(5):1682-1688.(in Chinese)
[13]石熊,张家生,刘蓓,等.红黏土与混凝土接触面剪切特性试验研究[J].中南大学学报(自然科学版),2015,46(5):1826-1831.SHI X,ZHANG J H,LIU B,et al.Experimental research on shearing properties of interface between red clay and concrete[J].Chinese Journal of Rock Mechanics and Engineering,2015,46(5):1826-1831.(in Chinese)
[14]张嘎,张建民.夹有泥皮粗粒土与结构接触面力学特性试验研究[J].岩土力学,2005,26(9):1374-1378.ZHANG G,ZHANG J M.Experimental study on monotonic behavior of soil-structure interface with slurry[J].Rock and Soil Mechanics,2005,26(9):1374-1378.
[15]张治军,饶锡保,王志军,等.泥皮厚度对结构接触面力学特性影响的试验研究[J].岩土力学,2008,29(9):2433-2438.ZHANG Z J,RAO X B,WANG Z J,et al.Experimental study on influence of slurry thickness on mechanical behavior of interface between gravel and concrete[J].Rock and Soil Mechanics,2008,29(9):2433-2438.(in Chinese)
[16]彭凯,朱俊高,张丹,等.粗粒土与混凝土接触面力学特性单剪试验研究[J].岩石力学与工程学报,2010,29(9):1893-1900.PENG K,ZHU J G,ZHANG D,et al.Experimental study on mechanical behaviour of soil-structure interface by ring shear test[J].Rock and Soil Mechanics,2009,30(11):3256-3260.(in Chinese)
[17]朱俊高,Shakir R R,杨有莲,等.土-混凝土接触面特性环剪单剪试验比较研究[J].岩土力学,2011,32(3):692-696.ZHU J G,SHAKIR R R,YANG Y L,et al.Comparison of behaviors of soil-concrete interface from ring-shear and simple shear tests[J].Rock and Soil Mechanics,2011,32(3):692-696.(in Chinese)
[18]孙涛,洪勇,栾茂田,等.采用环剪仪对超固结黏土抗剪强度特性的研究[J].岩土力学,2009,30(7):2000-2010.SUN T,HONG Y,LUAN M T,et al.Shear strength behavior of overconsolidated clay in ring shear tests[J].Rock and Soil Mechanics,2009,30(7):2000-2010.(in Chinese)
[19]黄文熙.土的工程性质[M].北京:水利水电出版社,1983.HUANG W X.Engineering properties of soils[M].Beijing:Hydraulic and Hydropower Press,1983.(in Chinese)
[20]周杰,周国庆,赵光思,等.高应力下剪切速率对砂土抗剪强度影响研究[J].岩土力学,2010,31(9):2805-2810.ZHOU J,ZHOU G Q,ZHAO G S,et al.Analysis of influence of shear rate on shear strength of sand under high stress[J].Rock and Soil Mechanics,2010,31(9):2805-2810.(in Chinese)
[21]徐肖峰,魏厚振,孟庆山,等.直剪剪切速率对粗粒土强度与变形特性的影响[J].岩土工程学报,2013,35(4):728-733.XU X F,WEI H Z,MENG Q S,et al.Effects of shear rate on shear strength and deformation characteristics of coarse-grained soils in large-scale direct shear tests[J].Chinese Journal of Geotechnical Engineering,2013,35(4):728-733.(in Chinese)
[22]中华人民共和国国家标准编写组.土工试验方法标准:GB/T 50123-1999[S].北京:中国计划出版社,1999.The National Standards Compilation Group of People's Republic of China.Standard for soil test method:GB/T50123-1999[S].Beijing:China Planning Press,1999.(in Chinese)
[23]唐世栋,何连生,傅纵.软土地基中单桩施工引起的超孔隙水压力[J].岩土力学,2002,23(6):725-732.TANG S D,HE L S,FU Z.Excess pore water pressure caused by an installing pile in soft foundation[J].Rock and Soil Mechanics,2002,23(6):725-732.(in Chinese)
[24]王育兴,孙钧.打桩施工对周围土性及孔隙水压力的影响[J].岩石力学与工程学报,2004,23(1):153-158.WANG Y X,SUN J.Influence of pile driving on properties of soils around pile and pore water pressure[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(1):153-158.(in Chinese)
[2]LIU H B,SONGE X,LING H I.Constitutive modeling of soil-structure interface through the concept of critical state soil mechanics[J].Mechanics Research Communications,2006,33(4):515-531.
[3]刘方成,尚守平,王海东.粉质黏土-混凝土接触面特性单剪试验研究[J].岩石力学与工程学报,2011,30(8):1720-1728.LIU F C,SHANG S P,WANG H D.Study of shear properties of silty clay-concrete interface by simple shear tests[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(8):1720-1728.(in Chinese)
[4]肖成志,冯晓静.土工格栅-黏性土界面特性的拉拔试验分析[J].土木建筑与环境工程,2012,34(3):47-51.XIAO C Z,FENG X J.Pullout-test analysis on properties of interface between geogrid and clay[J].Journal of Civil,Architectural&Environmental Engineering,2012,34(3):47-51.(in Chinese)
[5]RICHARD P J,TUNCER B E,PETER J R,et al.Effect of particle shape on interface behavior of demsimulated granular materials[J].The International Journal of Geomechanics,2001,1(1):1-19.
[6]王伟,卢廷浩,周爱兆.土与混凝土接触面反向单剪本构模型[J].土木建筑与环境工程,2011,33(2):1303-1306.WANG W,LU T H,ZHOU A Z.Constitutive model for negative simple-sheared soil concrete interface[J].Journal of Civil,Architectural&Environmental Engineering,2011,33(2):1303-1306.(in Chinese)
[7]GOMEZ J E,FILZ G M,EBELING R M,et al.Sandto-concrete interface response to complex load paths in a large displacement shear box[J].Geotechnical Testing Journal,2008,31(4):358-369.
[8]HU L M,PU J L.Testing and modeling of soilstructure interface[J].Journal of Geotechnical and Geoenvironmental Engineering,2004,130(8):851-860.
[9]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):431-435HU L M,PU J L.Experimental study onmechanical characteristics of soil-structure interface[J].Chinese Journal of Geotechnical Engineering,2001,23(4):431-435.(in Chinese)
[10]张嘎,张建民.大型土与结构接触面循环加载剪切仪的研制及应用[J].岩土工程学报,2003,25(2):149-153.ZHANG G,ZHANG J M.Development and application of a cyclic shear apparatus for soil-structure interface[J].Chinese Journal of Geotechnical Engineering,2003,25(2):149-153.(in Chinese)
[11]龚辉,赵春风,陶帼雄,等.应力历史对黏土-混凝土界面剪切特性的影响研究[J].岩石力学与工程学报,2011,30(8):1712-1719.GONG H,ZHAO C F,TAO G X,et al.Research on effect of stress history on shear behabior of interface between clay and concrete[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(8):1712-1719.(in Chinese)
[12]陈俊桦,张家生,李键.接触面粗糙度对红黏土-混凝土接触面力学特性的影响[J].中南大学学报(自然科学版),2016,47(5):1682-1688.CHEN J H,ZHANG J S,LI J.Influence of interface roughness on mechanical properties of red clay-concrete interface[J].Chinese Journal of Rock Mechanics and Engineering,2016,47(5):1682-1688.(in Chinese)
[13]石熊,张家生,刘蓓,等.红黏土与混凝土接触面剪切特性试验研究[J].中南大学学报(自然科学版),2015,46(5):1826-1831.SHI X,ZHANG J H,LIU B,et al.Experimental research on shearing properties of interface between red clay and concrete[J].Chinese Journal of Rock Mechanics and Engineering,2015,46(5):1826-1831.(in Chinese)
[14]张嘎,张建民.夹有泥皮粗粒土与结构接触面力学特性试验研究[J].岩土力学,2005,26(9):1374-1378.ZHANG G,ZHANG J M.Experimental study on monotonic behavior of soil-structure interface with slurry[J].Rock and Soil Mechanics,2005,26(9):1374-1378.
[15]张治军,饶锡保,王志军,等.泥皮厚度对结构接触面力学特性影响的试验研究[J].岩土力学,2008,29(9):2433-2438.ZHANG Z J,RAO X B,WANG Z J,et al.Experimental study on influence of slurry thickness on mechanical behavior of interface between gravel and concrete[J].Rock and Soil Mechanics,2008,29(9):2433-2438.(in Chinese)
[16]彭凯,朱俊高,张丹,等.粗粒土与混凝土接触面力学特性单剪试验研究[J].岩石力学与工程学报,2010,29(9):1893-1900.PENG K,ZHU J G,ZHANG D,et al.Experimental study on mechanical behaviour of soil-structure interface by ring shear test[J].Rock and Soil Mechanics,2009,30(11):3256-3260.(in Chinese)
[17]朱俊高,Shakir R R,杨有莲,等.土-混凝土接触面特性环剪单剪试验比较研究[J].岩土力学,2011,32(3):692-696.ZHU J G,SHAKIR R R,YANG Y L,et al.Comparison of behaviors of soil-concrete interface from ring-shear and simple shear tests[J].Rock and Soil Mechanics,2011,32(3):692-696.(in Chinese)
[18]孙涛,洪勇,栾茂田,等.采用环剪仪对超固结黏土抗剪强度特性的研究[J].岩土力学,2009,30(7):2000-2010.SUN T,HONG Y,LUAN M T,et al.Shear strength behavior of overconsolidated clay in ring shear tests[J].Rock and Soil Mechanics,2009,30(7):2000-2010.(in Chinese)
[19]黄文熙.土的工程性质[M].北京:水利水电出版社,1983.HUANG W X.Engineering properties of soils[M].Beijing:Hydraulic and Hydropower Press,1983.(in Chinese)
[20]周杰,周国庆,赵光思,等.高应力下剪切速率对砂土抗剪强度影响研究[J].岩土力学,2010,31(9):2805-2810.ZHOU J,ZHOU G Q,ZHAO G S,et al.Analysis of influence of shear rate on shear strength of sand under high stress[J].Rock and Soil Mechanics,2010,31(9):2805-2810.(in Chinese)
[21]徐肖峰,魏厚振,孟庆山,等.直剪剪切速率对粗粒土强度与变形特性的影响[J].岩土工程学报,2013,35(4):728-733.XU X F,WEI H Z,MENG Q S,et al.Effects of shear rate on shear strength and deformation characteristics of coarse-grained soils in large-scale direct shear tests[J].Chinese Journal of Geotechnical Engineering,2013,35(4):728-733.(in Chinese)
[22]中华人民共和国国家标准编写组.土工试验方法标准:GB/T 50123-1999[S].北京:中国计划出版社,1999.The National Standards Compilation Group of People's Republic of China.Standard for soil test method:GB/T50123-1999[S].Beijing:China Planning Press,1999.(in Chinese)
[23]唐世栋,何连生,傅纵.软土地基中单桩施工引起的超孔隙水压力[J].岩土力学,2002,23(6):725-732.TANG S D,HE L S,FU Z.Excess pore water pressure caused by an installing pile in soft foundation[J].Rock and Soil Mechanics,2002,23(6):725-732.(in Chinese)
[24]王育兴,孙钧.打桩施工对周围土性及孔隙水压力的影响[J].岩石力学与工程学报,2004,23(1):153-158.WANG Y X,SUN J.Influence of pile driving on properties of soils around pile and pore water pressure[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(1):153-158.(in Chinese)
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