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九洲台剖面沉积着完整黄土地层，是陇西典型黄土剖面之一。其中Ｑ１老黄土厚达１００ｍ以上，王永焱等专家对该剖面已进行过磁性、生物化石等方面研究．本文根据实际工程资料及试验结果，对九洲台剖面老黄土（Ｑ１）的物理、力学性质等工程特性进行讨论，并探讨其在天然状态下的应力应变关系、应力体变关系以及应变与侧应变关系特征，提出了应力应变关系及应变与侧应交关系数学模型。并且提出根据其数学模型，确定非线性参数切线模量（Ｅｔ）、切线泊桑比（μｔ）方法．
Jiuzhoutai profile deposition of a complete loess layer, is a typical Longxi Loess section. Among them, the thickness of the old loess of Q1 is more than 100m, Wang Yongyan and other experts have made researches on magnetic and biological fossils in this section. Based on the actual engineering data and the test results, the engineering characteristics of the old loess (Q1) in Jiuzhoutao section are discussed, and its stress-strain relationship, stress-strain relationship and strain and side Strain relationship characteristics, put forward the relationship between stress and strain and strain and the relationship between the side of the mathematical model. And according to its mathematical model, the tangent modulus (Et) and tangential Poisson’s ratio (μt) method for determining nonlinear parameters are proposed.