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山东安丘地区软土震陷及地震产生的土层构造新启示

田洪水, 王华林, 祝介旺, 杨传成, 吕明英, 张慎河

田洪水, 王华林, 祝介旺, 杨传成, 吕明英, 张慎河. 山东安丘地区软土震陷及地震产生的土层构造新启示[J]. 岩土工程学报, 2015, 37(4): 734-740. DOI: 10.11779/CJGE201504020
引用本文: 田洪水, 王华林, 祝介旺, 杨传成, 吕明英, 张慎河. 山东安丘地区软土震陷及地震产生的土层构造新启示[J]. 岩土工程学报, 2015, 37(4): 734-740. DOI: 10.11779/CJGE201504020
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TIAN Hong-shui, WANG Hua-lin, ZHU Jie-wang, YANG Chuan-cheng, LÜ Ming-ying, ZHANG Shen-he. New revelation from seismic subsidence of soft soils and earthquake-induced soil-layer deformation structures in Anqiu area, Shandong Province[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(4): 734-740. DOI: 10.11779/CJGE201504020
Citation: TIAN Hong-shui, WANG Hua-lin, ZHU Jie-wang, YANG Chuan-cheng, LÜ Ming-ying, ZHANG Shen-he. New revelation from seismic subsidence of soft soils and earthquake-induced soil-layer deformation structures in Anqiu area, Shandong Province[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(4): 734-740. DOI: 10.11779/CJGE201504020
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山东安丘地区软土震陷及地震产生的土层构造新启示  English Version

  • 1. 山东建筑大学土木工程学院,山东 济南 250101; 2. 山东省地震工程研究中心,山东 济南 250014

基金项目: 国家自然科学基金项目（41272066）; 国家科技支撑计划项; 目（2012BAK19B04-02）
详细信息
    作者简介:

    田洪水（1956- ）,男,教授,从事土力学与地基基础、工程地质学教学与研究工作,近十年来致力于地震事件研究。E-mail: tianhongshui@126.com。

    通讯作者:

    田洪水

    王华林

New revelation from seismic subsidence of soft soils and earthquake-induced soil-layer deformation structures in Anqiu area, Shandong Province

  • 1. School of Civil Engineering of Shandong Jianzhu University, Jinan 250101, China; 2. Earthquake Engineering Research Center of Shandong Province, Jinan 250014, China

摘要

    摘要
  • 摘要: 通过地震调查、土工试验和14C测年,从沂沭断裂地震带安丘地区的全新世中—晚期湖沼相软土中,识别出了软土震陷灾害现象和地震产生的软土沉陷向斜褶曲、小尺度同震断层、狭缩-膨胀构造和震裂缝等共生土层变形构造,其中,软土沉陷向斜是直接反应震陷灾害的纵向土层变形。小尺度同震断层是地震产生的小断层,发育在沉陷向斜之下,其垂向延长0.5~1.8 m。沉陷向斜随着同震断层的产生而初现;又紧随断层向深部延伸而向下发展。地震振动使饱和软土发生触变,土质点从沉陷向斜的转折端向两翼发生流动,在此过程中,附加地震应力不断作用,结果形成了窄而深的沉陷向斜。软土震陷最大深度为1.08 m,平均震陷深度为0.68 m。推断当时的地震烈度达到Ⅷ度、震级超过M6。测得淤泥质土的14C年龄为 3901±33a B.P.,该地震事件约发生公元前19世纪。同震断层是形成震陷的重要诱导因素,这为认识软土震陷的形成机理提供了新资料;也为防治或减轻软土震陷的危害提出了新启示。因此,应重视软土下伏土层可能产生同震断层的隐患。
    Abstract: By means of seism investigation, soil test and 14C dating, disaster phenomena about seismic subsidence of soft soils and some earthquake-induced association structures of soil layers are identified in soft soils of limnetic facies during the Mid-late Holocene in the Anqiu area of Yishu fault-seismic zone, including subsidence synform folds of soft soils, small scale co-seismic faults, pinch-and-swell structures and seismic fissures, in which subsidence synforms are vertical deformations that directly reflect the seismic subsidence disaster. Small scale co-seismic faults are some little faults caused by earthquakes, with vertical lengths of 0.5~1.8 m under the subsidence synform. A subsidence synform comes at first along with producing of co-seismic faults and developes downward treading on the heels of these faults extending to the even deeper place. The earthquake vibration causes the thixotropic deformation of saturated soft soils, and soil particles flow from the hinge zone to two wings of the synform, in which the seismic additional stresses act continually, resulting in formation of the narrow and deep-seated subsidence synform. The deepest seismic subsidence of soft soils is 1.08 m, and the average depth is 0.68 m. It is estimated that the seismic intensity is VIII degree, and the earthquake magnitude is over M6.0. The formation age of the mucky soils for 3901±33a B.P. is obtained by the14C dating, so the seismic event occurred in about 19th Century B.C.. The co-seismic fault is an important factor for forming the seismic subsidence of soft soils, which provides the new information for understanding the formation mechanism of the seismic subsidence of soft soils and the new revelation for preventing or mitigating the harm of the seismic subsidence. Therefore, attention should be paid to possible hidden troubles of co-seismic faults to be produced in the underlying layer of soft soils.
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  • 发布日期:  2015-05-05

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