工程场地的断层密度地质统计学分析  

Geostatistical analysis of fault density in an engineering site

作　　者：黄裕雄[1] 陈剑杰[1] 王华伟[1] 郑杨琳[1] 

机构地区：[1]西北核技术研究所,西安710024

出　　处：《水文地质工程地质》2011年第6期29-34,共6页Hydrogeology & Engineering Geology

摘　　要：为了深入研究某工程场地内断层的地质特征,通过收集、整理工程场地的地质资料和较系统的野外地质调查,应用指示克里格方法分析了场地内断层密度的空间分布特征。研究表明断层密度具有明显的各向异性分布特征。断层密度分布的主变程方向为296.4°,与工程场地长轴方向一致,在此方向上断层密度具有较好的相关性与连续性,工程地质条件较差。次变程方向为26.4°,在此方向上断层密度的相关性差,工程地质条件则较好。建立了工程场地地表断层密度的定量数学模型,主变程1 692m,次变程759m,主变程方向296.4°,块金值0.127,基台值0.263。划分了场地工程地质带,工程场地南部边缘地质条件较差,中部至北部边缘地质条件相对较好。For understanding of the geological features of faults in an engineering site,the author analyzed the spatial distribution characteristics of fault density with the indicator Kriging method after systematically collecting and processing the previous geological data of the engineering site and by conducting extensively surface and underground geological investigation in the field.The distribution of fault density is evidently anisotropic,with a dominant orientation（296.4°） close to the direction of the long axis of the engineering site,in which direction the fault density is much more continuous and correlative and the condition of the engineering geology is much worse.The secondary orientation is 26.4°,in which direction the fault density is much more worse,but the conditions of the engineering geology are much better.The mathematical model of the distribution of fault density is built up and the parameters such as dominant range（1692 m）,secondary range（759 m）,dominant orientation（296.4°）,nugget（0.127）,still（0.263） are determined.The site is divided into several engineering geological zones,and the geological conditions is worse in the southern edge,better in the middle part to the north edge.

关 键 词：断层 分布 地质统计学 变异分析 

分 类 号：P642[天文地球—工程地质学]