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中文摘要：
有关黄土抗强度及相关特性的研究甚少，其主要原因是土抵抗拉伸的能力过于微弱。近年来随着基础设施建设的快速发展，特别是黄土自然灾害的频发，使人们认识到土的抗拉强度是不能忽略的。而黄土微弱的抗拉能力使得在试验过程中任何操作引起的微小变化都可能导致其强度值的严重偏差，所以有一套严格准确的试验参数和正确无误的试验操作步骤势在必行。本文采用兰州市九州开发区的重塑黄土，用轴向压裂法系统研究了黄土在不同的加载速率、试样高度、制样方法、加载圆柱直径时的抗拉强度。结果表明轴向压裂法测试土体的抗拉强度时上述因素都有不同程度的影响。其中：加载速率在1．0mm／min下测定的不同试样强度值间的变化幅度为最小；高径比为1：1的试样的抗拉强度值既位于不同试样强度值变化过程的中间位置又处于强度相对差值的最小处；静压制样优于击实制样且其抗拉强度较大；抗拉强度测试值随加载圆柱体直径呈线性增大。研究结果可供土体抗拉强度试验参考，也可为土体抗拉强度试验方法的规范化和标准化提供基础数据和理论依据。
英文摘要：
The mechanical characteristic of loess is the most important factor that influences the stability of buildings, slopes, tunnels, underground structures, etc. Research on its tensile strength and related properties is less compared with the research on shear strength, collapsibility, and oth- er loess properties. The tensile strength of soils is seldom considered in engineering exploration, design,and stability analysis,because its tensile capacity is too weak and thus seems meaningless to common engineering. However, increasing infrastructure, such as railways, highways, airports, and high earth-rock dams, are being constructed in loess areas and natural hazards like landslides and slope avalanches keep occurring, so on one hand, the tensile strength and anti-cracking capaci- ty of loess has become much more significant to the stability of earth structures in loess. On the other hand, the very weak tensile ability of loess often has an adverse effect on research into its tensile characteristics. Because the tensile strength of loess is so small, any small change caused by sampling or testing might lead to serious deviation of test results. Therefore,rigorous test parameters and correct testing procedures are gravely needed. Using the unconfined penetration test, tensile strength characteristics of the remolded loess from the Lanzhou Jiuzhou Development Zone are thoroughly studied. The advantage of the unconfined penetration test is its simplicity and short duration. For testing, a strain-controlled triaxial apparatus is applied with different loading rate, specimen height, specimen preparation method, and penetration loading cylinder diameter, but the moisture content and dry density of the loess samples remains constant. Because the ten- sile strength of loess is very small,test error due to manipulation is inevitable, so variations in tensile strength of remolded loess with different factors are investigated with three sets of parallel tests for each factor. The test results indicate that tensile strength is af
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