Decompression Of The Three Axial Compression Test Of The Mechanical Characteristics Of Fissured Loess

This article makes a study on fissured loess through field investigation, indoor test andtheoretical analysis method, and describes basic features of loess fracture which is the part ofabundant fissured loess. Based on the reduced pressure tri-axial compression test, a systematicstudy is conducted on the mechanical characteristics of loess, deformation and failuremechanism and constitutive model for the system.The content of this paper is as following:Firstly, this paper describes the basic characteristics of fissure loess, classification offissure loess, and the engineering geological characteristics of fissure loess at the aspect of thestructural plane of the loess face and structure of loess.Secondly, this paper also introduces the schemes and test procedures of the reducedpressure tri-axial compression test. By making an analysis of this test in terms of strain curve,it is found that the more axial compressive force of fissure loess is increased, the moreobvious ruckbildung of strain curve is, and that peak intensity as well as elastic modulus ofsoil samples also increases with the increase of axial compressive force. In addition, thispaper also summarizes the ways of general deformation of fissure loess, its damage types andits destruction ways, and this study generalizes the deformation damage mechanics model andmaterial type.Thirdly, adopting geotechnical damage theory, general binary medium is deduced basedon loading function from Thornton Reul. And the constitutive model is established under thecondition of the reduced pressure tri-axial compression. Several groups of tests are selected toverify this constitutive model, and the result shows the constitutive model has certainapplicability.