吸力对弱膨胀土应力应变关系和强度的影响
发布时间：2018-08-01 09:29
【摘要】：本文对不同吸力的南阳弱膨胀土进行了一系列吸力控制的三轴剪切试验。试验结果表明:在净应力相同的条件下,试样的应力应变关系曲线随着吸力的增加而升高、剪缩体变小,并且随着吸力的增加其应力比-应变关系与强度、体变表现出类似超固结土的特性明显。其主要原因是试样受到较大的吸力,有效应力增加,弱膨胀土试样失水收缩、孔隙比减小均明显,使试样剪切过程中表现出类似超固结黏土的特性。吸力所引起弱膨胀性土体积收缩明显,不可忽视。因此预测非饱和弱膨胀性土的应力应变关系和强度特性需考虑吸力所引起的体积收缩影响。
[Abstract]:In this paper, a series of triaxial shear tests controlled by suction are carried out on Nanyang weakly expansive soil with different suction forces. The experimental results show that under the same net stress, the stress-strain relationship curve increases with the increase of suction, and the shear shrinkage becomes smaller, and the stress-to-strain relationship and strength increase with the increase of suction. Bulk deformation shows obvious characteristics similar to that of overconsolidated soil. The main reason is that the specimen is subjected to a larger suction, the effective stress increases, the weak expansive soil sample loses water and shrinks obviously, and the void ratio decreases obviously, which makes the specimen exhibit similar characteristics of overconsolidated clay in the shear process. The volume shrinkage of weakly expansive soil caused by suction can not be ignored. Therefore, to predict the stress-strain relationship and strength characteristics of unsaturated weakly expansive soils, the effect of volume shrinkage caused by suction should be considered.
【作者单位】： 华北水利水电大学河南省岩土力学与结构工程重点实验室;上海大学土木工程系;
【基金】：国家自然科学基金项目(11272194) 河南省基础与前沿研究计划项目(132300410021) 华北水利水电大学高层次人才基金项目
【分类号】：TU443
，
本文编号：2157133
[Abstract]:In this paper, a series of triaxial shear tests controlled by suction are carried out on Nanyang weakly expansive soil with different suction forces. The experimental results show that under the same net stress, the stress-strain relationship curve increases with the increase of suction, and the shear shrinkage becomes smaller, and the stress-to-strain relationship and strength increase with the increase of suction. Bulk deformation shows obvious characteristics similar to that of overconsolidated soil. The main reason is that the specimen is subjected to a larger suction, the effective stress increases, the weak expansive soil sample loses water and shrinks obviously, and the void ratio decreases obviously, which makes the specimen exhibit similar characteristics of overconsolidated clay in the shear process. The volume shrinkage of weakly expansive soil caused by suction can not be ignored. Therefore, to predict the stress-strain relationship and strength characteristics of unsaturated weakly expansive soils, the effect of volume shrinkage caused by suction should be considered.
【作者单位】： 华北水利水电大学河南省岩土力学与结构工程重点实验室;上海大学土木工程系;
【基金】：国家自然科学基金项目(11272194) 河南省基础与前沿研究计划项目(132300410021) 华北水利水电大学高层次人才基金项目
【分类号】：TU443
，
本文编号：2157133
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