不排水条件下轴向加卸载时结构性土的力学特性探讨

发布时间：2018-05-17 16:38

本文选题：土力学 + 结构性土　；参考：《岩石力学与工程学报》2017年02期

【摘要】：为研究结构性土在不排水条件下的力学特性,开展固结不排水条件下初始应力各向异性结构性土、各向同性结构性土及重塑土在25,50,100,200及400 k Pa共5种围压下的三轴加卸载试验,并利用二元介质概念对试验现象进行了分析。结果表明:结构性土在固结应力较低时结构性保持较好,存在明显的结构屈服强度,不同应力循环中平均模量无明显变化;固结应力较高时结构性减弱,表现为与重塑土相似的特性,受结构性减弱及正孔压等因素影响,平均模量随εa增加而减小;结构性土胶结元破损率与摩擦元中土颗粒间距随轴向应变增加而增大,卸载时体缩趋于明显。
[Abstract]:In order to study the mechanical properties of structural soils under undrained conditions, triaxial loading and unloading tests of initial stress anisotropic structural soils, isotropic structural soils and remolded soils under five confining pressures of 2550 100 200 and 400 KPA were carried out. The experimental phenomena are analyzed by using the concept of binary medium. The results show that the structural properties of structural soils are good when the consolidation stress is low, and there is obvious structural yield strength, and the average modulus of different stress cycles has no obvious change, while the structural strength weakens when the consolidation stress is high. The average modulus decreases with the increase of 蔚 a, and the damage rate of the cemented elements and the spacing of soil particles in the friction element increase with the increase of axial strain, the average modulus decreases with the increase of 蔚 a, and is similar to that of the remolded soil, and the average modulus decreases with the increase of 蔚 a, and the soil particle spacing increases with the increase of axial strain. The volume shrinkage tends to be obvious when unloading.
【作者单位】：四川大学水力学与山区河流开发保护国家重点实验室;四川大学水利水电学院;中国电建集团昆明勘测设计研究院有限公司;
【基金】：国家自然科学基金资助项目(51009103)~~
【分类号】：TU43

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