Study On Plane Strain Test Of Lime Stabilized Loess Of Jingyang

Loess as a kind of special soil, is widely distributed in the central and western regions of China. With the rapid development of economy, the engineering constructions in loess area are inevitable. But loess filling is difficult to meet the modern engineering requirements of foundation strength, deformation and durability of high standard, because of the high compressibility, collapsibility and water sensitivity of natural defect. Therefore, it is necessary for stabilized loess to meet the engineering requirements in the technology and economy and provide effective parameters for similar projects, which make important practical significance to the economic development of our country eventually.Based on the mechanical properties and test methods of previous studies on the characteristic of stabilized loess, this article will research the deformation, strength and localization of lime stabilized Loess under different influence factors by using PY-10 type of plane strain apparatus, which means under the circumstances of different lime content,moisture content, the different curing age, confining pressure, consolidation the stress ratio.Analysis of soil consolidation, the change laws of the deformation and strength of the different influence factors, and then draw the conclusion of the influence of shear strength of lime and the influence soil deformation localization at last. The main conclusions are as follows:(1) The compaction characteristics of lime stabilized loess of JingyangThe loess in different lime under compaction test showed dry density decreases significantly with the increase of moisture content increased at first and then increased with the increase of loess.Lime incorporation, optimum moisture content of lime soil ratio increases, with the increase of the quantity of added lime, incorporation of lime loess compaction curve, soil is gentle.In practical engineering and mixing lime loess compaction should be timely, otherwise it will cause the maximum dry density decreased and the influence of compaction effect.(2) The stress-strain relationship of lime stabilized loess of JingyangThere are hardening and softening two types of lime stabilized loess under plane strain stress strain curves with different influence factors. The curing time is longer in softeningcurve,and the soil showed brittle failure. But the curing age is short in the hardening curve.The stress- strain curve was influenced significantly by the confining pressure, the lime content, water content, curing time, consolidation stress ratio. With the initial moisture content decreasing, the consolidation confining pressure increased with the increase of adding lime into the amount of the stress-strain curve increased in different degrees. During period,different consolidation stress the ratio of the soil, the stress-strain curve was different.(3) The shear strength of Lime stabilized loess of JingyangIn the case of plane strain consolidation stress ratio, the amount of lime and water content on soil anti shear strength has a significant impact; whether or not isotropic consolidation and isotropic consolidation, with soil water content increasing significantly reduce the cohesion, internal friction angle increases with decreasing of moisture content of the smaller amplitude.The soil cohesion increases first and then decreases with the increase of the quantity of added lime; under the isotropic consolidation, internal friction angle of soil with lime content increases showed a trend of increase; while in the isotropic consolidation, when the initial water content of soil is small internal friction angle with lime content increases, when the initial water content of soil ratio large internal friction angle increases with the amount of lime and fly ash.(4) Lime stabilized loess, the relationship between principal stressesThe intermediate principal stress change with the shear time and are roughly three stages.The initial stage of principal stress axial strain curve with increasing rapidly, the initial slope; shear in the late of principal stress increases slowly, the slope of the curve decreases gradually.In the shear process, the shear stage σ1 and σ2 with the axial strain increases with the increase of shear; further, the stress-strain curve of σ1~ε1 and σ2~ε1 obvious inflection point inflection point, the two curves of the inflection point appeared at the same time, and probably in the axial strain ε1 =3%.(5) With the characteristics of lime stabilized loess shear JingyangPlane strain, the shear band are mainly three types: the "X" type, "V" shape of shear zone type shear band shape and single shear band shape; the Mohr-Columb theory to calculate the inclination angle of shear band is 64°~68° range, and the actual measurement of shear band inclination is 62°~70° range, the measured value is more close to the theoretical calculation value inclination.