黄土地区开展地质勘察工作应注意的几个问题

SEVERAL PROBLEMS NEEDED TO BE PAID ATTENTION TO FOR GEOLOGICAL INVESTIGATION AND SURVEYING IN LOESS AREA

本文就黄土地区河流岸坎地质勘察中易出现的一些问题 ,结合几个工程实例 ,进行了剖析。文中对由于在黄土岸坎取土 ,导致的黄土湿陷性判定失准和因对黄土岸坎处的镶嵌物、错落体、河流阶地等地质现象重视不够引起的地层判断失误 ,从而引起设计变更的问题 ,从勘察阶段到发现问题、解决过程进行了回顾。总结了在黄土地区工作的一些经验 ,提出了一些地质勘察工作应注意的问题 ,对同类地区今后开展工作有一定的参考意义。

Combined with several engineering projects, the author analyzes problems liable to occur in the geological investigation and surveying of riverbanks in the loess area, which include the improper discrimination for collapsibility of loess because of the soil borrowing in riverbanks, the discrimination errors for strata because of neglecting the mosaic objects, falling masses,river terrances and other geological phenomena in survey,as well as the subsequent design alternations and their resolutions.In this paper,the author sums up the experiences of practices in the loess area and lists the problems needed to be paid attention to in the geological investigation and surveying. They may be used also as reference for other projects in the similar area.