哈法亚油田勘察中土的性状判别问题初探

Preliminary Study on the Soil Property Identification in the Geotechnical Investigations for Halfaya Oilfield,Iraq

哈法亚油田位于伊拉克南部美索不达米亚平原上,其工程地质条件以粉土、黏土和砂土为主,土的性状判别是工程勘察的重要工作之一。在该工程勘察过程中,由于要求按欧美标准执行,而我国与西方国家在岩土分类体系方面存在不少差异,在粉土和高液限粉土的定义、标准贯入试验及其指标N60的应用以及砂土的密实度判别方面常常出现判断错误。为此,开展中外规范的对比分析,指出在工程勘察实践中应注意的问题,旨在为广大同行提供有益借鉴。

Halfaya oilfield is located in the plain of Mesopotamian,south Iraq.The subsurface soils mainly consist of silt,clay and sand.Soil property identification is an important aspect of the geotechnical engineering.It is required that the geotechnical investigation work be performed in accordance with the western codes and there are fairly great difference between the state of the practice in China and western countries.These differences exist in the definitions of silt and elastic silt,empirical relationship between soil properties and blow counts of Standard Penetration Test as well as the criteria for the relative density of the sandy soils.This paper compares the differences of the above aspects and provides recommendations of the geotechnical investigation work if the western code is being used.