硫酸盐渍土路基盐冻胀变形量计算方法探讨

Discussion on calculation method of salt dilating and frost-heave deformation occurred in sulphate saline soil subgrade

通过对新疆兵团垦区硫酸盐渍土路基的野外试槽试验测得的地温、盐冻胀变形量等试验数据进行整理,并运用SPSS软件进行多元线性回归分析,探讨了硫酸盐渍土路基的盐冻胀变形规律、盐冻胀变形量的影响因素及其计算方法,研究结果表明:①在一个冻融循环周期内,路基中各测点的地温-变形量曲线可以分成3个阶段,不同阶段的盐冻胀变化规律不同;②在降温、升温过程中,硫酸盐渍土路基盐冻胀变形量的影响因素不同,相应的计算公式也不同;③在一个冻融循环周期内,路基中各测点的盐冻胀变形量的最大值均出现在升温初期,因此,建议采用升温过程中盐冻胀变形量的计算公式计算路基的最大盐冻胀变形量。

Based on the tested ground temperature, salt dilating and frost-heave deformation etc. in the subgrade filled by the sulphate saline soil in site in corps reclamation area of Xinjiang Autonomous Region, using the multiple linear regression theory in SPSS software, the paper discusses the rule of the salt dilating and frost-heave deformation, the factors affect the salt dilating and frost-heave deformation, and the calculation method of the salt dilating and frost-heave deformation occur in the sulphate saline soil subgrade. The main conclusions are as follows. （~）In one freezing and melting cycle, the tested ground temperature--salt dilating deformation curve can be separated into three phases, and the property of each phase is different. ~）When the ground temperate is going up, the factors affecting the salt dilating and frost-heave deformation and the calculation method of the deformation are different from it when the ground temperate is lowered down. @In one freezing and melting cycle, the maximum salt dilating deformation in the subgrade occurred when the ground temperature rises; thus the formula based on the data tested during the temperature rises is recommended to calculate the maximum salt dilating deformation.