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为探究灰白砂岩颗粒料在侧限压缩情形下孔隙比—应力(e-p)曲线变化规律及其数学表达,设置砂泥配比、干密度及含水率三因素共11种方案,得到各方案下砂岩颗粒料的e-p曲线,并将e-p曲线与双对数坐标指数模型曲线进行对比,评价模型理论e-p曲线与砂岩颗粒料试验曲线吻合程度。试验结果及模型分析表明,不同砂泥配比时,双对数坐标指数模型颗粒料e-p曲线变化趋势与试验曲线一致;不同干密度时,当轴向应力处于0~0.8MPa时,该模型曲线与试验曲线吻合程度较高;不同含水率作用下砂岩颗粒料试验e-p曲线呈相互穿插形态,当应力处于0.4~1.6 MPa且含水率高于6%时,模型孔隙比理论值大于试验值。可见基于标准砂不同初始孔隙比建立的双对数坐标指数模型对不同干密度砂岩颗粒料e-p曲线数学表述吻合度较高,与不同砂泥配比及初始含水率的e-p曲线吻合度较低。
In order to explore the variation law of void ratio-stress (ep) curve and the mathematical expression of gray sandstone granule under confined compression, eleven schemes of sand-mud ratio, dry density and water content were set up, The ep curves of the pellets were compared with those of the exponential curve model and the exponential curve model. The experimental results and model analysis show that the trend of ep curve of double logarithmic index model pellets is consistent with the experimental curve when the ratio of sand and mud is different. At different dry density, when the axial stress is between 0 and 0.8 MPa, the model curve And the curve of the experimental data is in good agreement with the experimental curve. The ep curves of sandstone particles interpenetrated with different moisture content. When the stress is 0.4-1.6 MPa and the water content is higher than 6%, the model porosity ratio is higher than the theoretical value. It can be seen that the double logarithmic coordinate index model established based on the different initial void ratios of standard sands has a good agreement with e-p curve of different dry density sandstone particles, which is lower than the e-p curve of different sand ratios and initial moisture content.