An extension-dominant 9-km-long ground failure along a buried geological fault on the eastern Beijing Plain, China
Autor: | Tian Fang, Li Yumei, Wang Xinhui, Qi Minghuan, Liu Jiurong, Cui Wenjun, Tian Miaozhuang, Luo Yong, Zhang Jie, Zhao Long, Li Jin, Kong Xiangru, Liu He, Zhang Youquan, Lei Kunchao, Han Zhantao, Zhang Shuangcheng, Sha Te |
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Rok vydání: | 2021 |
Předmět: |
geography
geography.geographical_feature_category Deformation (mechanics) Exploration geophysics 0211 other engineering and technologies Drilling Geology 02 engineering and technology Fault (geology) Ground failure 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Beijing Groundwater pumping China Seismology 021101 geological & geomatics engineering 0105 earth and related environmental sciences |
Zdroj: | Engineering Geology. 289:106168 |
ISSN: | 0013-7952 |
Popis: | In the northern Beijing Plain (BPN), ground failures associated with land subsidence have occurred and rapidly progressed, damaging hundreds of buildings and roads in recent years. In 2016, an 8.7-km-long ground failure, named the Songzhuang (SZ) ground failure, was discovered in the eastern part of the Beijing Plain. Geological surveys, mapping, creep measurements, trenching, drilling, and geophysical exploration indicate that the SZ ground failure has geometric structural features and surface deformation that differ from those of other ground failures in the BPN: First, the SZ ground failure consists of one main fissure and many secondary fissures. Second, the SZ failure shows tensile deformation with negligible vertical dislocation. Third, in the profile, the SZ ground failure shows extensional cracks with limited extension depths that close gradually with depth. Based on the relationships between ground failures and influencing factors, including a pre-existing fault, earthquakes, and groundwater pumping, we conclude that this failure took shape after the earthquake, and was enlarged under the action of groundwater pumping. The pre-existing fault, which is a subsidiary fault of the northern section of the Nanyuan-Tongxian (NTN) fault, determined the area in which the SZ ground failure first formed. |
Databáze: | OpenAIRE |
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