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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。
Fractal calculation method can more accurately calculate the expansion deformation of bentonite, but there is no exact calculation of the coefficient K, which limits the wide application of this method. Based on the theoretical fact that both electric double layer (DDL) theory and fractal method are applicable under the double-layer expansion, the method of deducing the coefficient K in the fractal method by using DDL theory under the condition of double-layer expansion is proposed and the calculation method of commercial bentonite K value is 9.15. N2 adsorption test on commercial bentonite was carried out. The surface fractal dimension of bentonite was calculated to be 2.65 by isothermal adsorption data. The maximum swelling rate of bentonite was calculated by the coefficient K and surface fractal dimension. For comparison. The results show that the theoretical calculation of the fractal method is basically consistent with the experimental results. Especially when the applied pressure is large and the expansion deformation is small, the fractal calculation method is more in line with the experimental data than the electric double layer theory.