Study of the deformation mechanism of the Gaoliying ground fissure

Author:

Cheng G.,Wang H.,Luo Y.,Guo H.

Abstract

Abstract. The Gaoliying ground fissure in Beijing has caused building cracking and road damage, and has seriously influenced city construction. Based on investigations and trenching, the influences of the fault and the variation of groundwater levels on the formation mechanism of the Gaoliying ground fissure were investigated by using FLAC3D. The results indicated that (1) the surface location of Gaoliying fissure is controlled by the underlying normal fault activity, and over pumping further exacerbates development of the ground fissure; (2) when the groundwater level declines, obvious differential settlement occurs at both sides of the ground fissure, in which greater settlement occurs in the vicinity of the hanging wall, the greater the distance from the hanging wall, the smaller the ground subsidence, however smaller ground subsidence occurs in the vicinity of the footwall, the greater the distance from the footwall, the greater the ground subsidence; (3) the vertical velocity of the ground fissure triggered by the fault activity and groundwater decline ranges from 15.5 to 18.3 mm a−1, which is basically in line with the monitoring data. The fault activity contributes about 28–39 %, and the groundwater contributes about 61–72 % to the deformation of the ground fissure, respectively.

Publisher

Copernicus GmbH

Subject

General Medicine

Reference11 articles.

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2. Jia, S.: Annual report of land subsidence monitoring in Beijing, Beijing Institute of Hydrogeology and Engineering Geology, 2010 (in Chinese).

3. Jia, S. and Guo, M.: The Relation between Huangzhung-Gaoliying fault and fissure by Gaoliying Trench, City Geology, 4, 24–28, 2007 (in Chinese).

4. Jia, S., Wang, H., and Ye, C.: Investigation and survey methods appropriate for ground fissures in Beijing, Journal of Engineering Geology, 19 (suppl.), 104–111, 2011.

5. Lee, C., Zhang, J., and Zhang, Y.: Evolution and origin of the ground fissures in Xian, China, Eng. Geol., 43, 45–55, 1996.

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