期刊
ENVIRONMENTAL EARTH SCIENCES
卷 74, 期 9, 页码 6859-6870出版社
SPRINGER
DOI: 10.1007/s12665-015-4670-6
关键词
Bending mechanism; Ground fissure; North China plain; Shen-rao fault; Extension fracture
资金
- National Natural Science Foundation of China [41302249, 41430643, 41202196]
- Special Program for the Public Research of Ministry of Land and Resources of China [201411096]
- Postdoctoral fund of Jiangsu Province of China [1402063C]
- National Basic Research Program of China (973) [2013CB227900]
- laboratory of China University of Mining and Technology
The Anping fissure is one typical and particular ground fissure in the North China Plain. This study was carried out in Anping area with geological means, such as surveying, mapping, trenching and drilling. The geological structure and disasters were analyzed by both qualitative and quantitative methods. The main conclusions are as follows: (1) Anping ground fissure is the local manifestation of regional tectonic stress field and is basically folding directional, hidden and intermittent. (2) Under the control of Shen-rao fault, Anping ground fissure was exposed and expanded by water-related human activities, and then was cracked by small- and medium-sized earthquakes. (3) The forming process followed the bending-cracking rules. The uplifting force from deep in the earth bent the entire overlying strata. The tangential stress below the ground surface counterbalanced the horizontal stress of soils, even breaking through their tensile strength and inducing cracks. The fissure was periodic and wavery, because the cracking force was proportional to the uplifting force but inversely proportional to the stratigraphic depth.
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