马兰黄土黏性的试验研究与模型分析

 黄土黏性性质研究对认识黄土地区各种地质灾害的发育规律具有重要的意义。通过马兰黄土的直剪试验及对试验结果的分析，提出一种简单实用的方法来测定马兰黄土的黏滞系数。应用等应变直剪仪对马兰黄土原状土样进行剪切松弛试验，运用三参量黏弹性固体模型对试验数据进行分析，以确定马兰黄土的黏滞系数。通过研究，计算出不同含水量情况下马兰黄土的黏滞系数。进一步对试验结果分析表明，当含水量为13%～35%时，马兰黄土的黏性随含水量增加而逐渐增大，随正应力的增加也逐渐增大。

EXPERIMENTAL STUDY AND MODEL ANALYSIS OF VISCOSITY OF MALAN LOESS

It is of great significance to realize the development rule of geological disasters for study of the viscosity of loess. Lots of shear relaxation tests on Malan loess are conducted；and a simple and practical method is introduced to measure the coefficient of viscosity of Malan loess. On the basis of a viscoelastic solid model with three parameters，the coefficient of viscosity is determined by the measured data obtained from the shear relaxation tests by means of the least squares curve-fitting method. The coefficients of viscosity of Malan loess with different water contents are achieved. The results indicate that，when the water content is 13%－35%，the coefficient of viscosity increases with the water content and the normal stress on Malan loess.