压实膨润土膨胀变形的分形计算方法

发布时间：2018-02-24 08:51

本文关键词： 膨润土膨胀变形双电层理论分形计算方法表面分形维　出处：《岩土力学》2015年04期 　论文类型：期刊论文

【摘要】：分形计算方法能较准确地计算膨润土的膨胀变形,但系数K没有确切的计算方法,限制了该方法的广泛应用。基于双电层(DDL)理论和分形方法在双电层膨胀下都适用的理论事实,提出在双电层膨胀条件下采用DDL理论推导出分形方法中系数K的方法,并计算出商用膨润土的K值为9.15。对商用膨润土进行了N2吸附试验,利用等温吸附数据计算出该膨润土的表面分维为2.65,然后根据得出的系数K和表面分维采用分形方法计算了膨润土的最大膨胀率并与膨胀试验结果作对比。结果表明,分形方法的理论计算和试验结果基本一致,尤其是在施加压力较大而膨胀变形较小的情况下,分形计算方法计算结果比起双电层理论更符合试验数据。
[Abstract]:The fractal calculation method can calculate the expansion deformation of bentonite accurately, but the coefficient K has no exact calculation method, which limits the wide application of this method. Based on the theory of double electric layer DDL) theory and fractal method, both of them can be used under the expansion of double electric layer. In this paper, the coefficient K of fractal method is deduced by DDL theory under the condition of double electric layer expansion, and the K value of commercial bentonite is 9.15.The N2 adsorption test of commercial bentonite is carried out. The surface fractal dimension of the bentonite was calculated by isothermal adsorption data as 2.65. The maximum expansion ratio of bentonite was calculated by fractal method according to the coefficient K and surface fractal dimension, and the results were compared with the results of expansion test. The theoretical calculation of fractal method is basically consistent with the experimental results, especially when the pressure is large and the expansion deformation is small, the results of fractal calculation are more consistent with the experimental data than the double layer theory.
【作者单位】：上海交通大学船舶海洋与建筑工程学院;
【基金】：国家自然科学基金项目(No.41272318)
【分类号】：TU43

【相似文献】