陇东庆阳西峰地区黄土湿陷性分析

黄土的湿陷性是一个复杂的物理化学变化过程,其影响因素也是多方面的,其中黄土特殊的物理力学性质与其湿陷性就有着密切的关系。首先对陇东庆阳西峰地区某场地布置的探井所揭露的地层条件进行了概述,然后选取部分探井内扰动黄土样做了矿化成分试验。结果发现研究区黄土中易溶盐总含量很少,对研究区黄土湿陷性基本无影响。接着通过对研究区多组原状黄土样的室内试验数据进行大规模的统计分析,总结了研究区黄土的不同物理力学性质指标随黄土埋藏深度的变化规律;并根据所取土样的湿陷性试验结果对该区黄土进行了湿陷性评价。最后在此基础上对该区黄土湿陷系数与其不同物理力学性质指标间的关系作了探讨,认为这些指标反映了黄土的物质成分、结构特征和当前的赋存状态等属性,对研究区黄土湿陷性有不同程度的影响,这也为该区黄土场地的建设提供一定的理论指导参考。

Loess collapsibility analysis in Xifeng Qingyang Longdong area

The collapsibility of loess is a complex physical and chemical process, its influence factors are various. The physical and mechanical properties of loess are closely related to the collapse of loess among them. First, the formation conditions that the wells have revealed in Xifeng Qingyang Longdong area are outlined. Next, the experiment of the mineralized components of the disturbed loess sample in some wells is made, and the results show that there is only a little soluble salt in loess, which has no effect on the loess collapsibility in the study area. Then, through large-scale statistical analysis to groups of undisturbed loess samples of laboratory test data in the study area, the laws of different physical and mechanical properties index of loess changed with its buried depth in the study area are summarized. And according to the test results of loess samples, its collapsibility is evaluated. Finally, on the basis of the above, the relationship between loess collapsible coefficient and its different physical and mechanical properties index are analyzed. These indicators reflect the material composition, structure characteristics and the current state of the loess, which have different degrees of impact on the loess collapsibility in the study area,and which also provide some theoretical guidance for the construction of loess site in this area.