Based on the statistic information of physical feature indexes of mass density, water content and specific gravity of solids of loess along different depth on three high fluvial terraces in Lanzhou area, the in-place void ratios of loess varying with basic physical indexes are analyzed to obtain a calculating formula. In addition, reasonable parameters of foundation treatment are analyzed on dynamic compaction and compaction pile method. For dynamic compaction method, average consolidation induced by dynamic compact is used as a primary design parameter and quality detect index; for compaction pile method, reinforced depth and void ratio after treatment can be used to design the ratio of distance between piles and diameter of pile.%根据兰州地区3处大厚度高坪黄土的天然密度、含水量、土粒比重等物理性质指标沿深度变化的统计规律,分析了计算值—天然孔隙比随这些指标的变化规律,得出黄土天然孔隙比简化的计算公式.藉此分析强夯法、挤密桩法等地基处理方法的合理设计参数:对于强夯法,平均夯沉量可以作为初步设计参数和质量检测指标；对于挤密桩法,确定了加固深度和处理后的孔隙比,即可确定桩间距和桩径的比值.
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