THE TYPES OF LOESS PORES IN CHINA AND THEIR RELATIONSHIP WITH COLLAPSIBILITY

This paper presents chiefly a classification of the loess pores in the Loess Platcau according to their origin and size and deals with the characteristics of different sorts of pores and their distributional regularities in regions and loess layers of various ages. The relationship between various pores and collapsibility is also discussed in the paper. We come tto a conclusion that the supporting openings are one of the important factors causing the subsidence on wetting because of their looseness and unstability.     

中国黄土的孔隙类型与湿陷性

本文主要对我国黄土高原黄土的孔隙按照成因和大小分别进行了分类,并论述了各类孔隙的结构及其在区域上和不同层位上的变化规律,目的是为了确定黄土各类孔隙与湿陷性的关系。研究结果表明,黄土中的支架孔隙(按大小分类主要为中孔隙)很不牢固,是引起黄土产生湿陷变形的主要因素。     

陕西泾阳南塬黄土滑坡灾害与引水灌溉的关系

陕西泾阳南塬塬边黄土滑坡频繁发生，造成的经济损失和人员伤亡极为惨重。本文讨论了区内黄土滑坡灾害形成的地貌地形及地质环境特征，着重分析了人类不合理的引用地表水灌溉，改变了地下水文条件，从而降低了土体的抗剪强度，导致黄土滑坡形成的过程和机制。通过研究认为，合理进行灌溉，控制地下水位是改善塬边地质环境和防治滑坡灾害的关键措施。