粉质黏土与再生混凝土接触面剪切特性试验研究
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摘要
采用大型直剪仪进行粉质黏土与再生混凝土及普通混凝土的接触面剪切试验,用建筑垃圾和铁尾矿配制再生混凝土,接触面采用在粉质黏土上现浇混凝土形成,研究不同法向应力下接触面的剪切特性。试验结果表明:再生混凝土接触面的剪切位移-剪应力曲线与普通混凝土接触面的类似;接触面的抗剪强度与法向应力呈线性关系,在相同法向应力下再生混凝土接触面的抗剪强度大于普通混凝土接触面的抗剪强度;两种接触面的抗剪强度均小于土体自身的抗剪强度。接触面的初始剪切刚度模量随着法向应力的增加而增大,剪切刚度模量与大气压强的比值与法向应力与大气压强的比值在双对数坐标系上呈线性关系。
The shear characteristics of silty clay and recycled concrete and normal concrete interface were investigated by using the large scale direct shear apparatus,the recycled concrete was made from construction waste and iron tailings and its interface is made of cast-in-site concrete on silty clay. The test results reveal that shear displacement-shear stress curves of recycled concrete interface is similar to that of normal concrete interface. The shear strength of recycled concrete interface is linear with normal stress. Under the same normal stress,interface is higher than that of normal concrete interface. And two kinds of shear strength of recycled concrete is less than that of the silty clay itself. The initial shear stiffness modulus of contact surface increases with the increase of normal stress.The ratio of shear stiffness modulus to atmospheric pressure and the ratio of normal stress to atmospheric pressure are linear in the double logarithmic coordinate system.
The shear characteristics of silty clay and recycled concrete and normal concrete interface were investigated by using the large scale direct shear apparatus,the recycled concrete was made from construction waste and iron tailings and its interface is made of cast-in-site concrete on silty clay. The test results reveal that shear displacement-shear stress curves of recycled concrete interface is similar to that of normal concrete interface. The shear strength of recycled concrete interface is linear with normal stress. Under the same normal stress,interface is higher than that of normal concrete interface. And two kinds of shear strength of recycled concrete is less than that of the silty clay itself. The initial shear stiffness modulus of contact surface increases with the increase of normal stress.The ratio of shear stiffness modulus to atmospheric pressure and the ratio of normal stress to atmospheric pressure are linear in the double logarithmic coordinate system.
引文
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13杨有莲,朱俊高,余挺,等.土与结构接触面力学特性环剪试验研究[J].岩土力学,2009,30(11):3256-3260Yang Youlian,Zhu Jungao,Yu Ting,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
2徐萌波,王社良,张明明.再生混凝土力学性能试验研究[J].混凝土,2018(7):72-75Xu Mengbo,Wang Sheliang,Zhang Mingming.Experimental study on mechanical properties of recycled concrete[J].Concrete,2018(7):72-75
3刘康宁,王社良,彭晓晖,等.矿物料改性再生混凝土基本力学性能试验研究[J].混凝土,2018(6):93-96,100Liu Kangning,Wang Sheliang,Peng Xiaohui,et al.Experimental study on basic mechanical properties of recycled aggregate concrete modified with mineral materials[J].Concrete,2018(6):93-96,100
4刘坚,吴城斌.再生混凝土发展现状及性能研究[J].混凝土,2018(6):148-150Liu Jian,Wu Chengbin.Development status and performance research of recycled concrete[J].Concrete,2018(6):148-150
5乔宏霞,关利娟,曹辉,等.再生骨料混凝土研究现状及进展[J].混凝土,2017(7):77-82Qiao Hongxia,Guan Lijuan,Cao Hui,et al.Recycled aggregate concrete research status and progress[J].Concrete,2017(7):77-82
6陈琛,冷伍明,杨奇,等.混凝土桩-泥皮-砂土接触面力学特性试验研究[J].岩土力学,2018,39(7):2461-2472Chen Chen,Leng Wuming,Yang Qi,et al.Experimental study of mechanical properties of concrete pile-slurry-sand interface[J].Rock and Soil Mechanics,2018,39(7):2461-2472
7赵春风,吴悦,赵程,等.考虑卸荷效应的砂土-混凝土接触面剪切特性影响研究[J].岩石力学与工程学报,2018,37(4):1020-1029Zhao Chunfeng,Wu Yue,Zhao Cheng,et al.Effect of unloading on shear behavior of interface between sand and concrete[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(4):1020-1029
8金子豪,杨奇,陈琛,等.粗糙度对混凝土-砂土接触面力学特性的影响试验研究[J].岩石力学与工程学报,2018,37(3):754-765Jin Zihao,Yang Qi,Chen Chen,et al.Experimental study on effects of the roughness on mechanical behaviors of concrete-sand interface[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(3):754-765
9王博,刘志强,赵晓东,等.高压正融土与结构接触面剪切力学特性试验研究[J].岩土力学,2017,38(12):3540-3546Wang Bo,Liu Zhiqiang,Zhao Xiaodong,et al.Experimental study on shearing mechanical characteristics of thawing soil and structure interface under high pressure[J].Rock and Soil Mechanics,2017,38(12):3540-3546
10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):1826-1831Shi Xiong,Zhang Jiasheng,Liu Bei,et al.Experimental research on shearing properties of interface between red clay and concrete[J].Journal of Central South University(Science and Technology),2015,46(5):1826-1831
11冯大阔,张建民.粗粒土与结构接触面静动力学特性的大型单剪试验研究[J].岩土工程学报,2012,34(7):1201-1208Feng Dakuo,Zhang Jianmin.Monotonic and cyclic behaviors of coarse-grained soil-structure interface using large-scale simple shear device[J].Chinese Journal of Geotechnical Engineering,2012,34(7):1201-1208
12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):1720-1728Liu Fangcheng,Shang Shouping,Wang Haidong.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.
13杨有莲,朱俊高,余挺,等.土与结构接触面力学特性环剪试验研究[J].岩土力学,2009,30(11):3256-3260Yang Youlian,Zhu Jungao,Yu Ting,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