A Study On Permeability Of Soda-saline Soil By Crystalline Aluminium Chloride

Saline soil in China are widely distributed, because of their special engeering properties, so rich in saline land above the road infrastructure as a process of re-building difficult. Songnen plain a large area of the distribution of saline soil, the majority belonging to inland saline soil type soda. Soda-type composition of saline soil mainly in NaHCO₃ and Na₂CO₃, the unique engeering properties in highway construction as follows: soda-type saline soil resulted in poor drainage capacity of the road to settlement, such as road embankment collapse disease.Songnen plain areas of long-term construction of highway embankment filling replacement method using a stable replacement of the nature of the soil as the embankment in order to avoid the saline soil of the highway have a disease. However, the method can not fundamentally solve the problem of road diseases caused by: on the one hand, after replacement of the embankment fill and the surrounding saline soil border, after a period of time will still be renewable salinization, disease recurrence Highway; On the other hand spoil placement areas of agriculture and the environment placed in saline soil after the migration of harmful effects.In this study, subjects selected for the Songnen Plain soda saline soil type, the use of the AlCl₃ volume on the field started to recover soil samples disturbance type soda Improvement of saline soil permeability. Infiltration through the soil tests, dispersion tests, soil pH testing and determination of the micro-structure observation test, the infiltration from the soil nature, dispersion, pH and micro-particles to analyze the crystal structure of four soda AlCl3 modified the effect of saline soil type, Test results are as follows:AlCl₃ have the effect of improved to soda-type saline soil affect the permeability coefficientκ, the volume of 1.0% when its adding AlCl₃ better than that of 0.5%, 1.5%; Secondly, the greater the amount of AlCl3 volume, the smaller the particle dispersion; AlCl₃ for gender substances to improve saline soil type when soda acidic for improved alkaline saline soil, saline soil of the embankment to reduce the structural strength of the corrosion. Therefore it can be concluded:AlCl₃ adding volume of soda-type saline soil permeability have a good effect to improve. If the pilot project to further develop the site, you can use the mechanism of the pilot to abandon a thorough method of filling replacement. Songnen plain areas of saline soil type soda highway roadbed soil using the importance of localization significance.