干湿循环效应下黄土抗拉强度试验研究

发布时间：2018-03-25 23:28

本文选题：土力学　切入点：黄土　出处：《岩石力学与工程学报》2017年S1期

【摘要】：采用单轴拉伸法对原状和重塑黄土干湿循环下的抗拉强度进行试验研究,通过试验数据探讨原状和重塑黄土的抗拉强度与含水率和干湿循环次数的关系,分析干湿循环下黄土的抗拉强度衰减机制。试验结果表明:原状和重塑黄土的抗拉强度随含水率的减小呈非线性的增大,为负指数函数关系;同一含水率下的原状和重塑黄土的抗拉强度随干湿循环次数的增加而减小,最后基本趋于稳定。多次的干湿循环后原状黄土的抗拉强度衰减值与重塑黄土的抗拉强度衰减值和黄土抗拉结构强度之和基本相等,证明多次的干湿循环作用打破了原状黄土的原有结构,使得其抗拉结构强度消失;间接说明经过多次干湿循环后原状和重塑黄土的吸附强度衰减值相同,并使得原状和重塑黄土具有基本相同的结构。
[Abstract]:The tensile strength of undisturbed and remolded loess under dry-wet cycle was studied by uniaxial tensile method. The relationship between tensile strength of undisturbed loess and remolded loess, moisture content and times of dry-wet cycle was discussed through test data. The tensile strength attenuation mechanism of loess under dry-wet cycle is analyzed. The experimental results show that the tensile strength of undisturbed and remolded loess increases nonlinearly with the decrease of moisture content and is a negative exponential function. The tensile strength of undisturbed and remolded loess under the same moisture content decreases with the increase of dry-wet cycles. After repeated dry and wet cycles, the tensile strength attenuation value of undisturbed loess is basically equal to that of remolded loess and the sum of tensile structural strength of loess. It is proved that many dry and wet cycles break the original structure of undisturbed loess and make its tensile strength disappear, which indirectly indicates that the attenuation value of adsorption strength of undisturbed loess is the same as that of remolded loess after several dry and wet cycles. And make the original and remoulded loess have the same structure.
【作者单位】：南昌工程学院水利与生态工程学院;长安大学地质工程与测绘学院;铁道第三勘察设计院集团有限公司;
【基金】：国家科技支撑计划课题(2013BAJ06B04) 陕西省科技统筹创新工程计划项目(2012KTDZD03 04)~~
【分类号】：TU444

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