| 渭河盆地基底伸展与地裂缝成因关系探讨 |
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| 引用本文： | 邓亚虹,彭建兵,李丽,慕焕东.渭河盆地基底伸展与地裂缝成因关系探讨[J].工程地质学报(英文版),2013,21(1):92-96. |
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| 作者姓名： | 邓亚虹 彭建兵 李丽 慕焕东 |
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| 作者单位： | 1.长安大学 西部矿产资源与地质工程教育部重点实验室 西安 710054; |
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| 基金项目： | 国家自然科学基金资助项目(41002106);国土资源大调查项目(1212011120067);长安大学中央高校基本科研业务专项资金项目(CHD2010JC098) |
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| 摘 要： | 渭河盆地是我国乃至世界上地裂缝最为发育,灾害最为严重的地区。本文以渭河盆地为原型,采用有限元数值分析方法,分析了基底伸展作用下盆地浅表层岩土介质和多级破裂系统的应力和变形响应特征,从而揭示基底伸展变形与该区域地裂缝之间的成因关系。结果表明,盆地基底的伸展作用可以引起近地表岩土介质的拉张变形,当这种拉张作用与盆地断裂的上盘正断倾滑式伸展拉张叠加时,必然形成或加剧地表土层的张剪性破裂,从而为地裂缝的发育奠定了构造基础。
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| 关 键 词： | 地裂缝 基底伸展 成因关系 渭河盆地 有限元法 |
| 收稿时间： | 2011-03-13 |
CAUSATIVE RELATIONSHIP BETWEEN BASEMENT STRETCHING AND GROUND FISSURES FORMATION IN WEIHE BASIN |
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| DENG Yahong PENG Jianbing Li Li MU Huandong.CAUSATIVE RELATIONSHIP BETWEEN BASEMENT STRETCHING AND GROUND FISSURES FORMATION IN WEIHE BASIN[J].Journal of Engineering Geology,2013,21(1):92-96. |
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| Authors: | DENG Yahong PENG Jianbing Li Li MU Huandong |
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| Institution: | 1.Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Chang'an University, Xi'an 710054;2.Open Research Laboratory of Geotechnical Engineering, Ministry of Land and Resources, Chang'an University,Xi'an 710054;3.Department of geological engineering, Chang'an University,Xi'an 710054 |
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| Abstract: | The Weihe Basin can be the most developed area of ground fissures and the associated geo-hazard in China and even in the world. Taking the Weihe Basin as the prototype, a numerical analysis with finite element method is made to study the stress and strain response characteristics of superficial ground and multistage fracture system subjected to the action of basement stretching. The germination relationship between deep structure activities and ground fissures development is revealed. Results show that the basement stretching can cause the tensile deformation of superficial ground. When this kind of action is coupled with normal dip-slipping tension of faults, it can inevitably form or aggravate the tension-shear fracturing, and establish the tectonic foundation for the development of ground fissures. |
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