兰州东郊非原生黄土湿陷特点研究

Subsidence properties of non-primary loess in east of Lanzhou

基于野外调查,对兰州东郊阳洼沟黄土的物理力学特性进行了室内试验。结果表明,非原生黄土不仅在物理力学特性上与原生黄土有显著差异,其湿陷系数明显小于原生黄土,而且其湿陷性随深度变化表现为明显的非均匀性。土体结构是造成该场地黄土湿陷性这一特点的主要原因。根据阳洼沟黄土湿陷特点,阐述场地地裂缝的形成机理,为阳洼沟场地非原生黄土湿陷系数和持力层的确定提供参考。

Based on the investigation, a few lab tests are conducted to study mechanical properties of loess at Yangwagou, in the east of Lanzhou. The test results show that there is a great difference in mechanical properties between primary loess and non-primary loess, and that the subsidence of non-primary loess in the same depth varies with its location. The structure of soil was proposed to explain these properties in the study area. It was suggested that the ground fissure should result from the subsidence difference. Finally, this study also put forward a reference, according to which, the subsidence coefficient of non-primary loess and supporting layer are obtained in Yangwagou.