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基于不同p H值溶液中泥质页岩的循环崩解试验,得到了不同粒径范围颗粒百分含量随崩解次数的变化关系。结果表明,p H值较小时小粒径的颗粒百分含量普遍较大,且随着崩解次数的增加而增大,最终趋于稳定。基于能量耗散原理,建立了岩石单次崩解后新增表面能及循环崩解累积新增表面能的计算公式,重点论述了p H值变化对泥质页岩崩解过程新增表面能的影响规律,结果表明:随着崩解循环次数的增加,岩石表面能单次增量越小,酸碱度变化对泥质页岩崩解表面能单次增量的影响较大;p H值越小,岩石循环崩解累积表面能增量越大,且趋于稳定所需的循环次数越少,说明酸性溶液有助于加速泥质页岩的崩解,碱性溶液对泥质页岩的崩解影响较小。最后,建立了泥质页岩崩解过程中能量耗散量预测的对数函数表征公式,分析认为,模型参数随p H值的增大基本呈相似的递减规律。
Based on the cyclic disintegration test of shale shale in solutions with different p H values, the variation of percentage of particles in different particle sizes with the number of disintegration was obtained. The results showed that the particles with small p H values were generally larger in percentage, and increased with the increase of disintegration times and finally stabilized. Based on the principle of energy dissipation, the formulas for calculating the surface energy added by single disintegration after rock disintegration and the surface energy added by cyclic disintegration are established. The new surface energy of disintegration of shale shale is mainly discussed. The results show that with the increase of the number of disintegration cycles, the single increment of rock surface energy is smaller and the change of pH has a greater effect on the single increment of the surface energy of shale shale. The p H value Small, cyclic disintegration of rock The larger the increase in cumulative surface energy and the less number of cycles that tend to stabilize, indicating that the acidic solution helps to accelerate the disintegration of shale shale, the alkaline solution to shale shale Disintegration less affected. Finally, a logarithmic formula for predicting the energy dissipation in shale shale during the disintegration process is established. The analysis shows that the model parameters decrease with the increase of p H value.