论文部分内容阅读
越来越多的岩土工程涉及到土体的抗拉强度问题,如土石坝心墙裂缝、地面开裂、水力劈裂等都是土体拉伸破坏的表现形式。为研究非饱和土的抗拉强度特性,对平卧式土体抗拉强度试验装置中侧壁倾角的设计值进行了理论推导,基于此分析对传统的土体抗拉强度试验装置进行了改进,并以非饱和细砂为研究对象,运用等速率单轴拉伸方法开展了不同干密度和含水率条件下的非饱和土抗拉强度试验研究,探讨了土体抗拉强度随干密度和含水率的变化规律,结果表明:非饱和细砂的抗拉强度随干密度的增大而增大,随含水率变化呈现“增-减-增”变化规律。
More and more geotechnical engineering involves the tensile strength of soil, such as earth-rock dam core wall cracks, ground cracking, hydraulic splitting are all forms of soil tensile damage. In order to study the tensile strength characteristics of unsaturated soils, the design value of sidewall inclination in horizontal tensile strength test device is theoretically deduced. Based on this analysis, the traditional tensile strength test device for soil is improved , And taking unsaturated fine sand as the research object, the uniaxial tension method is used to study the tensile strength of unsaturated soils with different dry densities and moisture contents. The relationship between tensile strength and dry density The results show that the tensile strength of unsaturated fine sand increases with the increase of dry density, and the variation law of “increasing-decreasing-increasing” as the moisture content changes.