Abstract

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Title:: Recognition Features of Non-outcropping Ground Fissures for the Third Investigation Site in Xi’an

Author(s):: SONG Yan-hui; LI Zhong-sheng; GAO Hu-yan; CONG Lu; CHENG Yao; 1. School of Geology Engineering and Geometrics, Chang’an University, Xi’an 710054, Shaanxi, China; 2. Xi’an Metro Co. Ltd., Xi’an 710018, Shaanxi, China

Keywords:: ground fissure; geological disaster; investigation; zoning for site; recognition feature; shallow artificial seismic exploration; engineering geological drilling; Xi’an

Abstract:: The types of investigation sites for ground fissures in Xi’an were divided, and the recognition of non-outcropping ground fissure for the third investigation site was analyzed. Based on the differences of topography, geomorphy and stratigraphic sedimentary in Xi’an area, the third investigation site of Xi’an ground fissure was divided into three zones, including Ⅲ-0, Ⅲ-1 and Ⅲ-2 zones. Ⅲ-0 zone is located in the northern suburb of Xi’an, which belongs to flood plain and Ⅰ-order terrace of Wei River, and there is no ground fissure until now; Ⅲ-1 zone is located in the western suburb of Xi’an, which belongs to Ⅰ-order diluvial platform; Ⅲ-2 zone is located in the eastern suburb of Xian, which belongs to Ⅰ-order terrace of Chan River and Ba River. According to many geophysical explorations and engineering geological drillings in Ⅲ-1 and Ⅲ-2 zones, it is suggested that shallow artificial seismic exploration and engineering geological drilling are combined in Ⅲ-1 zone, and only engineering geological drilling is used in Ⅲ-2 zone because of the thick pebble layer which can be regarded as marker bed. For Ⅲ-1 zone, the interval of control hole is not more than 40 m with the hole depth of 80-100 m; for Ⅲ-2 zone, the interval of control hole is 60-80 m with the hole depth of 60-70 m.