Experimental study on mechanical properties and constitutive relation of CSG materials
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摘要: 通过大型三轴试验得到了胶凝堆石料应力-应变关系曲线，分析了其力学性能，并针对关系曲线存在明显的非线性及软化特性，采用分段描述的方法建立了胶凝堆石料的本构关系，即破坏强度前考虑剪切所引起的体积变化采用双模量K-G模型描述，峰值强度后软化曲线的数学模型通过数据的回归分析和参数反演方式分析得到，各模型参数均可通过大三轴试验获取，方便可靠。Abstract: The stress-strain relationship curve of cementitious CSG materials is obtained through the large-scale triaxial tests, and its mechanical properties are analyzed. In response to the obvious nonlinear and softening characteristics of the relationship curve, a segmented description method is used to establish the constitutive relation of cementitious CSG materials. The volume change caused by shear is considered in the curve before failure strength, and a two-modulus K-G model is used to describe it. The mathematical model for the softening curve after the peak strength is obtained through the regression analysis of data and parameter inversion analysis.The parameters of each model can be easily determined through the large-scale triaxial tests.
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Keywords:
- CSG material /
- stress and strain /
- age /
- constitutive relation /
- large-scale triaxial test
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表 1 60 d龄期胶凝堆石料各向等压固结试验结果
Table 1 Results of isotropic isobaric consolidation tests on CSG materials at age of 60 d
压力p/kPa 试样初始体积Vc/cm3 固体颗粒体积Vs/cm3 排水量Vf/cm3 孔隙比e 400 44405.70 36400 1506.9 4.14 600 44836.02 36400 1335.8 3.67 800 44193.49 36400 1187.5 3.26 
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