颗粒级配对混合土力学性质影响的试验研究
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摘要
利用按质量比制备的黏土和细砂的混合土,开展混合土的固结快剪试验和压缩试验,探讨颗粒级配对混合土强度和变形特性的影响,基于分形维数对颗粒级配特征的定量描述,建立了混合土强度参数、变形参数与分形维数的函数关系。研究结果表明:分形维数较含砂量更好地反映了混合土强度和变形特性随着颗粒级配变化的规律,分形维数2.467(含砂量80%)为混合土力学性质明显变化的界限值,反映了颗粒级配渐变引起混合土力学性质突变的现象,为合理解释混合土力学特性变化提供了实验依据。
The sand-clay mixtures fabricated by mixing clay and fine sand were prepared with different dry mass ratios.The characteristics of strength and deformation of sand-clay mixtures were studied by using the consolidation direct shear test and the compression test.Based on the quantitative description of grain size distribution by fractal dimension,the function relationships between strength/deformation parameters and fractal dimension were established,respectively.The results showed that the fractal dimension was better than the sand content to reflect the change rules of strength and deformation with the grain size distribution.The fractal dimension 2.467(the sand content=80%) was a threshold,which reflected the phenomenon of the abrupt change of the mechanical properties caused by the gradual change of the grain size distribution of sand-clay mixtures.This study can provide experimental evidence to reasonably explain the change of mechanical properties of sand-clay mixtures.
The sand-clay mixtures fabricated by mixing clay and fine sand were prepared with different dry mass ratios.The characteristics of strength and deformation of sand-clay mixtures were studied by using the consolidation direct shear test and the compression test.Based on the quantitative description of grain size distribution by fractal dimension,the function relationships between strength/deformation parameters and fractal dimension were established,respectively.The results showed that the fractal dimension was better than the sand content to reflect the change rules of strength and deformation with the grain size distribution.The fractal dimension 2.467(the sand content=80%) was a threshold,which reflected the phenomenon of the abrupt change of the mechanical properties caused by the gradual change of the grain size distribution of sand-clay mixtures.This study can provide experimental evidence to reasonably explain the change of mechanical properties of sand-clay mixtures.
引文
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[16]中华人民共和国水利部.土工试验规程:SL 237—1999[S].北京:中国水利水电出版社,1999.
[2]王淑云,鲁晓兵,时忠民.颗粒级配和结构对粉砂力学性质的影响[J].岩土力学,2005,26(7):1029.
[3]IGWE O,SASSA K,WANG F.The influence of grading on the shear strength of loose sands in stress-controlled ring shear tests[J].Landslides,2007,4(1):43.
[4]蒋明镜,郑敏,王闯,等.不同颗粒级配的某火山灰的力学性质试验研究[J].岩土力学,2009,30(增刊2):64.
[5]刘映晶,李罡,尹振宇,等.颗粒级配对粒状材料不排水力学特性的影响[J].岩土力学,2015,36(2):423.
[6]贾卫兵,郭飞,杨爱武.考虑含砂量影响的砂-黏混合土应力-应变关系特性研究[J].工程地质学报,2014,22(6):1102.
[7]邓通发,艾志伟,罗嗣海,等.黏质土-砂混合物剪切特性试验研究[J].人民长江,2014,45(9):95.
[8]邱模清,艾志伟,罗嗣海,等.淤泥质土-砂混合软土的固结压缩试验研究[J].江西理工大学学报,2014,35(3):23.
[9]谢和平.分形几何及其在岩土力学中的应用[J].岩土工程学报,1992,14(1):14.
[10]FILGUEIRA R,FOURNIER L,SARLI G O,et al.Sensitivity of fractal parameters of soil aggregates to different management practices in a pohaeozem in central argentina[J].Soil and tillage research,1999,52(3):217.
[11]SAN J M F,MARTIN M A,CANIEGO F J,et al.Multifractal analysis of discretized X-ray CT images for the characterization of soil macropore structures[J].Geoderma,2010,156(1/2):32.
[12]BIRD N,DIAZ M C.Fractal and multifractal analysis of pore-scale images of soil[J].Journal of hydrology,2006,322(1/2/3/4):211.
[13]徐永福,黄寅春.分形理论在研究非饱和土力学性质中的应用[J].岩土工程学报,2006,28(5):635.
[14]TYLER S W,WHEATCRAFT S W.Fractal scaling of soil particlesize distribution:analysis and limitations[J].Soil science society of America journal,1992,56(2):362.
[15]王国梁,周生路,赵其国.土壤颗粒的体积分形维数及其在土地利用中的应用[J].土壤学报,2005,42(4):545.
[16]中华人民共和国水利部.土工试验规程:SL 237—1999[S].北京:中国水利水电出版社,1999.