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粗粒土与混凝土接触面特性单剪试验研究

ISSN号：1000-6915
期刊名称：《岩石力学与工程学报》
时间：0
分类：TU41[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098, [2]河海大学岩土工程科学研究所,江苏南京210098, [3]成都勘测设计研究院工程分院,四川成都610072
相关基金：国家自然科学基金、雅砻江水电开发联合研究基金项目（50639050）; 水利部公益性行业科研专项经费项目（200801133）; 中央高校基本科研业务费专项资金项目（2010B14814）

关键词：土工试验, 接触面, 混合土, 单剪试验, 剪缩, 剪胀, soil test, contact interface, mixed soil, simple shear test, shear contraction, shear dilatation

中文摘要：

采用大型单剪仪进行粗粒土与混凝土接触面在膨润土以及混合土（膨润土中掺入水泥）泥皮条件下的剪切试验。通过对不同水泥浆含量的混合土泥皮接触面进行试验,揭示不同泥皮条件下接触面的力学特性。结果表明,与无泥皮或膨润土泥皮时不同,存在混合土泥皮时,剪应力与剪应变关系曲线存在明显软化段,峰值强度的位置与水泥含量以及法向应力大小有关。水泥含量越大其相应的强度越大,水泥含量由10%提高到40%时,其相应的内摩擦角提高约3.2倍,水泥含量为40%时,其强度达到无泥皮时的84%。剪切破坏时,在同一高度处,法向应力越大,切向位移也越大;同样的法向应力及高度处,切向位移随水泥含量的提高而增大。无泥皮、低法向应力下,试样出现明显的剪胀现象,而泥皮条件下试样均表现为剪缩。试样的有效高度对粗粒料的强度及变形有一定的影响,最大粒径为20mm时,高度分别为100与30mm的试样相比,其内摩擦角及水平位移偏差分别为3%和6%左右。与最大粒径为60mm试样相比,最大粒径20mm试样的内摩擦角要小1.9°,减幅4.8%。

英文摘要：

The mechanical behaviors of interface between coarse-grained soil and concrete were investigated by simple shear tests with both bentonite slurry and mixed soil slurry（bentonite mixed with cement grout）.In addition,the mechanical behaviors of interface were analyzed with different slurries.The results show that the relation curves between shear stress and shear strain exist strain softening,and strain hardening appears with bentonite slurry or without slurry,when mixed soil slurry exists;and the position of peak strength is mainly related to normal stress and cement content.The more the cement content is,the larger the strength becomes.The value of friction angle with 40 percent cement grouts is 3.2 times higher than that with 10 percent cement grouts,the strength accounts for 84 percent of the interface strength without slurry.The shear displacement increases with increasing normal stress and cement content at the same height in shear failure state.Shear dilatation is significantwhen the surface without slurry in small normal stress state,while shear contraction is significant with the bentonite slurry and the mixted soil slurry.Compared the sample with height of 100 mm to that with height of 30 mm,the errors of friction angle and horizontal displacement are about 3% and 6%,respectively,when the maximum grain size is 20 mm,which shows that the height of sample affects the strength and deformation to some extent.In addition,the friction angle reduces by 4.8%,i.e.1.9°,compared to the maximum grain size of 60 mm.

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