西安地裂缝勘察特殊情况探讨

Discussion on Special Cases in Investigations of Xi’an Ground Fissures

西安地裂缝一般场地的勘察方法较成熟,而复杂场地地裂缝勘察尚无成熟的方法及判别标准。根据西安地裂缝场地的地质构造、沉积环境、地层成因及特殊工程地质性质,结合西安地裂缝分布规律及发育特征,在一般场地地裂缝勘察方法的基础上,综合复杂场地的地裂缝勘察经验,对西安地裂缝勘察时的几种特殊情况予以归纳总结和探讨,得出了二类标志层错断不明显的二类场地、二三类场地交汇地段、近地表有出露迹象的三类场地、地裂缝两侧地下水水位异常场地的勘察方法及判别标准。分析结论可为复杂场地的西安地裂缝勘察提供一定的借鉴。

The investigation method of ground fissure in general site in Xi’an is relatively comprehensive,but there is no improved criterion for ground fissure investigation in complex site.According to the geological structure,sedimentary environment,formation causes and special engineering geological properties of Xi’an ground fissure site,combined with the distribution law and development characteristics of Xi'an ground fissure,on the basis of general site ground fissure investigation methods and the ground fissure investigation experience of complex site,several special situations of Xi’an ground fissure investigation are summarized and discussed.The investigation methods and criteria are obtained for class 2 sites where the fault of class 2 marker layer is not obvious,the intersection of class 2 and class 3 sites,class 3 sites with exposure signs near surface,and sites with abnormal groundwater level on both sides of ground fissures.The analysis results can provide reference for the investigation of Xi’an ground fissures in complex sites.