Experimental Research On The Engineering Property Of Sulphate Saline Soil Improved By Fly Ash

Has dissolved sulphate saline soil subsidence, salt expansion and corrosion properties, and its composition is very different from ordinary soil, solid phase containing a crystalline salt, a salt solution containing the liquid, and the strength and deformation characteristics are also general different soil. In China, the distribution of a large area of saline land area, with the progress of construction, a number of construction projects have brought the face of saline soil engineering harm. Therefore, more and more experts and scholars began the study of saline soil, saline soil diseases they project the causes, factors were studied, and achieved certain results. This is for the development and utilization of saline soil resources, reduce unnecessary harm engineering, played a very important practical significance and social value.In this paper, Wuzhong City HONGSIBU sulphate saline soil to test the soil, by people sulphate saline soil preparation for the study, under the control of the same dry density and moisture content of the premise, systematic study of fly ash sulphate saline soil strength and improved improvement effect deformation characteristics. The results show that:through conventional undrained triaxial tests, the shear strength parameters of fly ash to improve sulphate saline soil were analyzed. Consider fly ash content, salt content and curing age and other factors on the shear strength parameters.Content in the test range, the same salt content, ash saline soil strength sulfuric acid improved during the same curing age with increasing fly ash content and continuously improve the shear strength parameters of cohesion C and internal friction angle values with increasing fly ash content and continue to improve.The same salt content, the same fly ash content, strength and growth over time continue to strengthen, but in curing period of 14 days, the shear strength parameters of cohesion C reaches a maximum, and internal friction angle values are decreased; when curing period of 28 days, the shear strength parameters of cohesion C decreased, while internal friction angle value increases.Under the same fly ash content, shear strength after curing age the same period of fly ash to improve with increasing sulfuric acid saline soil salinity decreases and then increases the salt content of 2% shear strength Min.Improved sulfuric ash carried saline soil in oedometer compression deformation properties of fly ash to improve sulphate saline soil compression deformation were analyzed. Consider fly ash content, salt content and curing age and other factors on the compression factor. Content in the test range, the same salt content, the compression factor during the same curing age of fly ash to improve with increasing sulfuric acid saline soil fly ash content decreases; the same salt content, the same powder ash content, the compression factor of the growth over time and continue to decrease, but the pre decrease faster; the same compression factor of fly ash, fly ash during the same curing age of Sulphate Salty Soil improvement with the maximum compression factor increased salinity increases after the first decrease salt content of 2%.To sum up, fly right sulphate saline soil strength and deformation characteristics improvement is possible, and there is a certain amount of time effect. Saline land area in the construction process, the results of this experimental study can provide a reference.