真空-电渗联合作用下软基固结基础理论计算研究

STUDY ON BASIC THEORETICAL CALCULATION OF SOFT FOUNDATION CONSOLIDATION UNDER THE COMBINED ACTION OF ELECTROOSMOSIS AND VACUUM

目前广泛应用的电渗系数计算公式大多基于模型进行推导,但由于其本身模型的局限性,无法对电渗加固中的一些现象进行进一步的解释,如最佳含盐量等,且该理论计算的电渗系数与实测数据差距较大。研究基于N–P方程和模型中的相关理论,开展电渗加固作用机理研究,建立了综合考虑电场和化学场的电渗系数模型,通过与既有文献试验结果的对比,验证了本研究模型的合理性和有效性。相较于传统电渗模型,本研究模型具有如下特点:模型的推导是从电渗的微观机理角度出发,利用了基于离子迁移的N–P方程;适用的含盐量范围更大,且与模型相比计算误差更小;较为全面地考虑了毛细管中阳离子电流密度、粘土整体电导率等电场因素。

At present,most of the widely used formulas for calculating electroosmotic coefficient are based on H-S model,but due to the limitation of its own model,it is impossible to further explain some phenomena in electroosmotic reinforcement,such as the optimal salt content,and there is a big gap between the electroosmotic coefficient calculated by this theory and the measured data.In this paper,based on the relevant theories of N-P equation and H-S model,the mechanism of electroosmotic reinforcement is studied,and an electroosmotic coefficient model considering electric field and chemical field is established.The rationality and validity of the model are verified by comparing with the experimental results of the existing literature.Compared with the traditional electroosmosis model,this model has the following characteristics:the derivation of the model is based on the micro-mechanism of electroosmosis,using the N-P equation based on ion migration;the applicable range of salt content is larger,and the calculation error is smaller than that of H-S model;the electric field factors such as cationic current density in capillary and overall conductivity of clay are comprehensively considered.