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岩土材料的强度问题一直是岩土力学研究的热点。在对多种不同结构性原状黄土的真三轴试验基础上,分析了不同结构性原状黄土的强度变化规律。结果表明,当含水率较低时,干密度变化对结构性原状黄土的强度影响较大于含水率的变化,反之,含水率变化对结构性原状黄土的影响大于干密度的变化;当结构性黄土的强度越大时,其在π平面上的破坏线越接近于抹圆曲边三角形;反之,当结构性黄土的强度越小时,其在π平面上的破坏线越接近于抹圆角三角形;结构性黄土随着结构性的增大,在π平面上的强度破坏线从抹圆角三角形逐渐向抹圆曲边三角形发展,最终趋近于Mises圆。各种原状黄土的摩擦角φ13随中主应力比b值的增大而微弱减小,而内凝聚力c随着中主应力比b值的增大呈现先增大后减小的变化。
The strength of geomaterials has always been a hot research topic in geotechnical engineering. Based on the true triaxial tests on a variety of structurally intact loess, the strength variation of different structural intact loess was analyzed. The results show that when the moisture content is low, the change of dry density affects the strength of structural undisturbed loess more than the change of water content. On the contrary, the change of water content affects the structural undisturbed loess more than that of dry density. The larger the strength of the loess is, the more the failure line in the π plane is closer to the trimming triangle; on the contrary, when the strength of the structural loess is smaller, the breaking line in the π plane is closer to the dicing triangle; With the structural increase of structural loess, the strength failure line in the π plane gradually develops from smearing triangle to smearing circle and finally converges to Mises circle. The friction angle φ13 of all kinds of intact loess decreases weakly with the increase of the value of b, while the cohesion c increases first and then decreases with the increase of b value.