基于正交试验的重塑黄土抗拉强度影响分析

Analysis of influence on tensile strength of remolded loess based on orthogonal test

随着国家对西北地区基础设施的快速建设,黄土区域中的地质灾害频频发生,其中黄土抗拉强度成为不可忽略的影响因素。为了探求室内试验下黄土抗拉强度的影响因素,本文基于正交试验法开展了轴向压裂试验,分析了含水率、干密度、衬垫直径、试样高度、制样方式5个因素对黄土抗拉强度的影响程度,并通过极差分析和方差分析得出了单因素和综合因素对黄土抗拉强度值的影响。结果表明:含水率对抗拉强度值的影响程度明显大于其他因素;抗拉强度值随含水率的增大而减小,并与衬垫直径和干密度呈线性关系。试验结果对原有试验方法的修正和完善土体的强度理论有着重要意义,对解决实际工程问题有着重大的应用价值。

With the rapid construction of infrastructure in northwest China,geological disasters occur frequently in the loess region,in which the tensile strength of loess becomes a non-negligible factor. In quest of the laboratory test of tensile strength of loess under the influence of factors,this article is based on the orthogonal experiment method under axial fracturing test,analysis of moisture content,dry density,pad diameter,height of sample,sample preparation methods of five factors on the influence degree of the tensile strength of loess, the poor through the single factor analysis and variance analysis and comprehensive factors influence on loess tensile strength values.The results show that the influence of water content on the tensile strength of remolded loess is greater than other factors.The tensile strength decreases with the increase of water content and has a linear relation with liner diameter and dry density.The test results are of great significance to the modification of the original test methods and the improvement of the strength theory of soil mass,and have great application value to solve practical engineering problems.