随着水化的进行,黏土矿物在不同的水化阶段所吸附的水有不同的结构和性质,可分为自由水和结合水,他们和黏土的连结形式不同.国内外相关学者更多地考虑不同结合水类型及含量的定性分析,而定量分析黏土吸附水、研究不同吸附水类型及含量对岩石力学参数的影响,可以为建立力-化学耦合模型提供定量化修正.在假设钠蒙脱土矿物颗粒为六面体的前提下,结合其微观吸水特性,建立钠蒙脱土结合水含量与总吸附含水量的幂函数关系模型.并用热失重分析法测定室温吸水样、风干含水样、室温吸附样及等温吸附样等钠蒙脱土含水样的吸附水类型及含量.将实验数据与模型求解数据拟合,结果表明,所建模型的相对误差之乘积与相对误差之几何平均值均近似等于1,因此所建立的模型有较高的预测精度.%In hydration process, water molecules adsorbed by clay particles in different hydration stages have different structures and properties. The adsorbed water includes free water and bound water, which have different ways of being attached onto clay particles. Researchers both at home and abroad have paid more attention to qualitative analysis of the type and amount of the bound water, the quantitative analysis of bound water and research on the effects of the type and amount of bound water on rock mechanics, on the other hand, provides a quantitative correction method for the establishment of force – chemistry coupling model. Assume that the sodium montmorillonite particles are in a shape of hexahedron, a power function model describing the relationship between the amount of bound water and the total adsorbed water of sodium montmorillonite can be established taking into account the micro characteristics of water adsorption. The type and amount of water adsorbed by sodium montmorillonite can be measured with thermogravimetry, air-drying of clay, adsorption in room temperature and isotherm adsorption. The experimental data are then fitted with data from model calculation. The results show that the product of the relative errors and the geometric mean of relative errors of the established model are both approximately equal to 1, indicating that the established model has good precision of prediction.
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