山西晋中马兰黄土劈裂特性及抗拉强度研究  

Study on splitting characteristics and tensile strength of Malan loess in Jinzhong,Shanxi Province

作　　者：吕东东 李彦荣[1] 赵金贵[1] LYU Dongdong;LI Yanrong;ZHAO Jingui(Department of Earth Sciences and Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024

出　　处：《河南理工大学学报（自然科学版）》2021年第2期173-178,共6页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(41877276)。

摘　　要：为研究干燥黄土巴西劈裂试验的稳定性和有效性,本文从试样的劈裂特征、荷载-变形关系、抗拉强度与干密度的关系、直接拉伸与巴西劈裂抗拉强度等方面开展了原状与重塑马兰黄土的巴西劈裂试验研究。结果表明:试样破坏分为不同破坏类型,它们对试验结果影响不同,偏离直径裂纹的出现会使试样结果偏小;剔除破坏类型对抗拉强度影响较大的试验结果后,根据损伤点和峰值点将试样劈裂破坏过程分为3个阶段;随着干密度增加,损伤点和峰值点对应的荷载逐渐增加,而对应的竖向变形则先增大后减小;重塑黄土的抗拉强度随干密度增加,呈指数递增;巴西劈裂抗拉强度结果小于直接拉伸试验结果,且与直接拉伸抗拉强度之间存在较好的线性相关关系。In order to study the stability and reliability of the Brazilian splitting test of dry loess,the Brazilian splitting tests of undisturbed remolded Malan loesses for the aspects of splitting characteristic,load-deformation relationship,relations between tensile strength and dry density,and comparison of tensile strengths obtained from direct tensile test and Brazilian splitting test was carried out.The results showed that different failure patterns had different effects on the test results and the underestimated tensile strength was attributed to deviation of cracks away from diameter.After removing the results of obvious effect on tensile strength of unexpected failure patterns,the failure process was divided into three stages.With the dry density increasing,the load at damage point and peak gradually increased,while the corresponding vertical deformation increased first and then decreased.The tensile strength of the remodeled loess increases exponentially with dry density increasing.The results of Brazilian split tensile strength were lower than the direct tensile strength and there was a well linear correlation between them.

关 键 词：晋中 黄土 劈裂抗拉强度 破坏形态 干密度 

分 类 号：TU443[建筑科学—岩土工程]