黄土抗拉强度和各向异性研究

项目名称： 黄土抗拉强度和各向异性研究

项目编号： No.41262010

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 梁庆国

作者单位： 兰州交通大学

项目金额： 53万元

中文摘要： 黄土是典型的结构性和水敏感性特殊岩土材料，国内外针对其湿陷性和抗剪强度等方面已展开了大量的系统研究，成果颇丰。相比而言，国内外对其抗拉强度和各向异性特点的研究相对较少。这给正确理解黄土的地质力学特性和合理确定黄土工程设计的计算参数带来一定的偏差。本课题拟以兰州及其附近地区的典型黄土为研究对象，通过对原状黄土抗拉强度试验方法、拉伸应力应变规律和各向异性特点的试验研究和统计分析，结合黄土无侧限抗压强度和抗剪强度的对比试验研究，掌握影响黄土抗拉强度和各向异性的主要影响因素，考虑黄土的各向异性特点，提出相应的计算力学参数建议和本构模型，为全面认识黄土的结构性和垂直节理等特性及其工程应用提供数据支持和理论依据。

中文关键词： 黄土；抗拉强度；各向异性；试验研究；隧道工程

英文摘要： Loess is a special kind of soil due to its structural strength and water sensitivity.Numerous systematic studies have been conducted to investigate the collapsibility and shear strength, which had yielded great achievements both at home and overseas. In contrast, the tensile strength and anisotropy of loess have attracted much less attention and the related research were very poor. So some error or inaccuracy might occur when the fundamental mechanical properties of loess need to be considered correctly and the calculation parameters of loess engineering need to be determined rationally. This research is going to investigate the experimental method of tensile strength, stress and strain characteristics and anisotropy of intact loess in Lanzhou and the adjacent areas, to grasp the major influencing factors of tensile strength and anisotropy of loess by using experimental tests and statistical analysis. Combined with the comparative experimental research on unconfined compressive strength and shear strength of intact loess, the related calculation mechanical parameters and constitutive model would be proposed, which will take the anisotropy of loess into consideration. This research could also provide the basic data and lay the theoretical foundation to comprehensively understand the structural strength and vertic

英文关键词： loess；tensile strength；anisotropy；experimental inverstigation；tunnel engineering