干湿循环作用下西安特殊黄土的力学特性

发布时间：2018-04-06 06:03

本文选题：干湿循环　切入点：单轴压缩试验　出处：《科学技术与工程》2017年32期

【摘要】：为了研究西安特殊黄土的强度特性,在不同含水率和不同增湿减湿作用下进行无侧限抗压强度试验和单轴压缩试验,借此观察西安特殊黄土的力学特性及强度变化规律。结果显示:西安地区特殊黄土,无论是其单轴压缩强度还是无侧限抗压强度均随着含水率的降低而逐渐增大,并且呈现出黄土的含水率越低其强度值就越大,且强度值增加越来越快的现象,当黄土为干燥状态时其强度是达到最大;无论试样经历增湿减湿循环多少次,黄土的弹性模量随着含水率的降低在持续增大,并且呈现出随着含水率的降低其下降相同比例时弹性模量增大越明显的现象;无论经历增湿减湿循环多少次,泊松比随着含水率的降低逐渐减小,但与其他参数相比,泊松比并没有明显的变化。
[Abstract]:In order to study the strength characteristics of Xi'an special loess, the unconfined compressive strength test and uniaxial compression test were carried out under the action of different moisture content and different humidification and dehumidification, so as to observe the mechanical properties and the change law of strength of Xi'an special loess.The results show that the uniaxial compressive strength and the unconfined compressive strength of the special loess in Xi'an region increase with the decrease of moisture content, and the lower the moisture content of loess is, the greater the strength is.The strength value increases more and more rapidly, when loess is dry, its strength reaches the maximum, no matter how many times the sample goes through humidification and moisture reduction cycle, the elastic modulus of loess increases continuously with the decrease of moisture content.With the decrease of moisture content, the elastic modulus increases more and more obviously, no matter how many times the cycle goes through, the Poisson's ratio decreases gradually with the decrease of moisture content, but compared with other parameters, Poisson's ratio decreases gradually with the decrease of moisture content, but compared with other parameters, Poisson's ratio decreases gradually with the decrease of moisture content.Poisson's ratio has not changed significantly.
【作者单位】：西安科技大学建筑与土木工程学院;
【基金】：国家自然科学基金(51404193) 中国博士后基金面上项目(2015M572581) 陕西省自然科学基金青年人才项目(S2015YFJQ1194)资助
【分类号】：TU444

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