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粒间吸力的计算是非饱和土有效应力原理研究的重点之一。首先考虑土颗粒间胶结面积,建立了微观状态下土颗粒相互作用的理想简化模型,推导给出了土颗粒接触点处各个力之间的相互关系,并分析了宏观上两种典型的堆积方式,从而总结得到了粒间吸力的统一表达式。而后,讨论了土颗粒间胶结面积对粒间吸力的影响。结果表明,直接使用表面张力分量来计算粒间吸力,可以简化粒间吸力的计算。最后,通过算例分析,阐明了颗粒间胶结面积对粒间吸力大小的影响。并基于多孔介质双重有效应力的假说,引入本研究给出的考虑土颗粒间胶结面积的粒间吸力公式,推导得到了适用于低含水率条件下非饱和土双重有效应力的计算公式。
The calculation of interparticle suction is one of the focuses of the study on the principle of effective stress in unsaturated soils. Firstly, considering the cementing area between the soil particles, an ideal simplified model of soil particle interaction under the micro state was established. The relationship between each force at the contact point of the soil particles was deduced. Two macroscopic typical stacking modes , Thus concluded that the unified expression of the inter-particle suction. Then, the effect of intergranular cementing area on interparticle suction was discussed. The results show that the direct use of surface tension components to calculate the intergranular suction can simplify the calculation of intergranular suction. Finally, the influence of intergranular cementing area on the magnitude of intergranular suction is clarified through an example analysis. Based on the hypothesis of dual effective stress of porous media, the formula of intergrain suction considering the intergranular cementing area is introduced and the formula for calculating double effective stress of unsaturated soils under low water content is deduced.