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盐胀是硫酸盐渍土的主要危害,硫酸盐渍土机场地基处理的关键在于减少盐胀。通过不同荷载作用下的盐胀试验,研究了荷载对不同压实度、不同含盐量的硫酸盐渍土盐胀的抑制效果,拟合了盐胀经验公式,探讨了换填覆重法硫酸盐渍土机场地基处理。压实度不宜太高,在满足道面承载力的条件下建议在90%～95%之间取值;道面2m以下可以填弱盐渍土,建议含盐量不要超过0.5%;水分危险点危害最大,必须重视排水设计。给出了确定换填覆重法最小荷载及最小厚度的方法。计算表明,覆重荷载50kPa基本能抑制含盐量小于0.5%的硫酸盐渍土的盐胀,采用砂砾石材料最小覆重层厚度约2m。换填覆重法在西北地区硫酸盐渍土机场地基处理中具有较好的应用前景。
Salt swell is the major hazard of sulphate soils. The key to the treatment of sulphate saline soils is to reduce salt expansion. Through the salt expansion test under different loads, the effect of the load on the salt expansion of sulphate saline soils with different compaction degrees and salinities was studied, and the empirical formula of salt expansion was fitted. Saline soil airport ground treatment. Compaction degree should not be too high, in the condition to meet the bearing capacity of the surface of the proposed value of 90% to 95%; Pavement below 2m can be weighed saline soil, salt content is recommended not to exceed 0.5%; water hazard The most harmful point, we must attach importance to drainage design. The method of determining the minimum load and the minimum thickness of the overlay method is given. Calculations show that the 50 kPa sediment load can basically restrain the salt expansion of sulfate saline soil with salt content less than 0.5%. The thickness of the minimum thickness layer of sand and gravel material is about 2m. Replacement overburden method in the Northwest Sulphate airport ground treatment has a good application prospects.