随着国民经济的发展和西部大开发战略的实施，关中地区作为陕西省发展中心乃至西北地区的经济中心，其地位愈发地重要。与此同时该区位于我国湿陷性黄土广泛分布区，进行基础设施建设时不可避免的遇到黄土湿陷变形问题；另一方面由于关中地区的黄土湿陷性中等，不同于湿陷性严重的陇西、陇东及陕北地区，在建筑工程中应区别对待以免造成不必要的浪费。因此对关中地区黄土湿陷变形特性系统的研究有着重要的理论和实践意义，其可以为工程设计采取新的经济实用的治理方法和针对性的措施提供理论依据。 　　本文以关中地区湿陷性黄土取样的试验资料为基础，以黄土湿陷变形的定量值即湿陷系数为主线，采用定性和定量相结合、由浅入深的对关中地区黄土湿陷变形进行了系统的研究。 　　首先根据地形地貌和工程性质将关中地区湿陷性黄土分为黄土台塬区和宽阔的河谷平原区，并借助室内常规试验获得其粒度组成、可溶盐含量及其变化趋势；借助X衍射试验、化学成分分析获得其矿物组成与化学成分。 　　随后在对黄土湿陷影响因素的逐一分析的基础上，采用回归分析建立关中地区黄土湿陷系数与其中几重要指标（孔隙比e0、塑性指数Ip、含水量ω）间的回归方程式，进行相关性检验及计算结果与实际结果比较认为该式具有良好的应用效果。 　　最后针对广义湿陷即增湿湿陷借助割线模量法建立关中地区黄土湿陷变形全过程的本构模型，该模型计算结果不受初始孔隙比的影响，为准确进行湿陷性评价提供了依据。

With the development of the national economy and the accomplishment of the strategy of the West exploiting , Guan-zhong area is more important as the economic center of the Shaanxi province and the West-north area . At the same time the area is in the distribution region of collapsible loess in China , which determinates the collapsibility distortion of loess is the inevitable question when infrastructures are built in the area . On the other hand , the collapsibility of Guan-zhong’s loess is medium-scale , which is different with the area of the west and the east of Ganshu , the north of Shaanxi . This should be discriminated during building avoiding unnecessary waste . So the systemic study to the character of collapsibility distortion of Guan-zhong area is important in the theory and experience , which may provide the theory rule to the economic method during engineering design . 　　The paper is based on the testing data of the collapsible loess’ example of Guanzhong area , and assumes the collapsibility coefficient as the main line . And using qualitative and fixed quantity method to study systematically the collapsibility distortion of Guan-zhong area’s loess step by step . 　　First the paper divide the collapsible loess of Guan-zhong area into desk area and wide region of no relief . And using conventional test to get loess’ mesh size and the content of soluble salt and their changing tendency , using X diffraction paternity test and chemical constitution test to get its mineral component and chemical constitution. 　　Then on the base of individual analysis of influencing factors of loess’ collapsibility, the equation of regression aiming at the collapsibility coefficient and vital data of loess of Guanzhong area is established, which includes pore-solids ratio, plasticity index, moisture content. The correlation verification and the comparison between calculation with reality prove its correct result . 　　Last, constitutive equations of loess humectation collapsibility are established using secant module aiming at generalized collapsibility which is named humectation collapsibility . This module refrains from the influence of original pore-solids ration , which provides the evidence to the exact evaluation of collapsibility .