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以郴州地区典型煤系土为研究对象,制备了不同含水率的重塑煤系土试样进行三轴固结排水试验,计算得到了各含水率煤系土邓肯-张模型参数并分析了含水率对模型参数的影响。结果表明:试样均呈鼓胀破坏特征,无明显的峰值;试验初期,煤系土试样处于线弹性变形阶段,当应变达到3%~5%时,逐渐进入弹塑性变形阶段;含水率对煤系土邓肯-张模型各参数影响程度不同,其中c值受含水率影响显著,参数c、、Ei、K、Kb随含水率的增加而减小,参数m、n、Rf随含水率的增加而增大;试样含水率在15%-25%时,破坏比Rf值均在0.9以上,但并未发生剪切破坏,表明煤系土应力-应变关系呈硬化型特性。
Based on the typical coal measures of Chenzhou area, the samples of remolded coal measures with different water contents were prepared for triaxial consolidation drainage tests. The parameters of Duncan - Chang model of coal - bearing soil with various water contents were calculated and analyzed. Effect of rate on model parameters. The results show that all the samples show bulging failure characteristics and no obvious peaks. In the initial stage of the experiment, the coal-based soil samples are in the stage of linear elastic deformation. When the strain reaches 3% -5%, they gradually enter the elastoplastic deformation stage. The influences of various parameters on Duncan-Chang model of coal-bearing soil are different, among which the c value is significantly affected by the water content, and the parameters c ,, Ei, K and Kb decrease with the increase of water content. The parameters m, n, Increases and increases; when the moisture content of the sample is between 15% and 25%, the failure ratio Rf is above 0.9, but no shear failure occurs, indicating that the stress-strain relationship of the coal-based soil is in a hardening type.