罗湖断裂带地应力场三维有限元模拟分析
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摘要
罗湖断裂带位于深圳—五华断裂带的南西段,由13条NE向断层和6条NW向断层组成,断裂分布密集。该断裂带位于深圳市区,周围高楼林立,其中的F8断裂被证实为活断层并于1994年曾有过异常活动,因而对于该断裂带的构造活动性进行研究意义重大。在对罗湖断裂带地质特征研究的基础上,建立起三维地质模型,采用弹塑性有限元法对断裂带地应力场进行数值模拟。根据模拟结果,分析罗湖断裂带地应力的分布特征、断层存在对地应力场的影响,并在此基础上对断裂带的构造稳定性进行分析。研究表明,断裂带的存在对地应力大小、方向、连续性、应力集中程度有明显影响;局部位置存在塑性破坏区,构造稳定性稍差,存在进一步活动的趋势,尤以F8,F9断裂北西段为甚。由于塑性破坏的发生会导致应力某种程度的释放,从而使应力集中程度较低,断层的活动将以蠕滑方式为主,不足以形成中强地震。
Luohu Fault Zone is a part of Shenzhen—Wuhua Fault Zone and composed of 13 faults trending in NE direction and 6 faults trending in NW direction in the area of 38 km2,where faults are very dense.This fault zone is inside of Shenzhen City where many tall buildings locate,and F8,a fault of Luohu Fault Zonei,s an active fault which acted in 1994.So it is very important to study the crustal stability of this fault zone.The geologic conditions of this zone are introduced firstly,then the 3D geological model is built and the numerical modeling of geostress field is finished with the elastoplastic finite element method.According to the modeling results,the characters of the geostress and the influence of the faults on the geostress field are expounded and the tectonic stability of the area is analyzed.The study shows that these faults have remarkable effect on the magnitude,direction,continuity and concentration degree of the geostress,and the tectonic stability in a few sites is bad because of the existence of plastic failure zone.It is very serious in the area which is be enclosed by F8,F13,F205 and F206,because the plastic failure can induce the stress relief and the decrease of the stress concentration degree,the main action manner of the faults is creeping slide and middle or strong earthquake will not happen.
Luohu Fault Zone is a part of Shenzhen—Wuhua Fault Zone and composed of 13 faults trending in NE direction and 6 faults trending in NW direction in the area of 38 km2,where faults are very dense.This fault zone is inside of Shenzhen City where many tall buildings locate,and F8,a fault of Luohu Fault Zonei,s an active fault which acted in 1994.So it is very important to study the crustal stability of this fault zone.The geologic conditions of this zone are introduced firstly,then the 3D geological model is built and the numerical modeling of geostress field is finished with the elastoplastic finite element method.According to the modeling results,the characters of the geostress and the influence of the faults on the geostress field are expounded and the tectonic stability of the area is analyzed.The study shows that these faults have remarkable effect on the magnitude,direction,continuity and concentration degree of the geostress,and the tectonic stability in a few sites is bad because of the existence of plastic failure zone.It is very serious in the area which is be enclosed by F8,F13,F205 and F206,because the plastic failure can induce the stress relief and the decrease of the stress concentration degree,the main action manner of the faults is creeping slide and middle or strong earthquake will not happen.
引文
[1]广东省地质矿产局.广东省区域地质志[M].北京:地质出版社,第25卷增2马淑芝等.罗湖断裂带地应力场三维有限元模拟分析?3903?1988.(Bureau of Geology and Mineral Resources of Guangdong Province.Geological Annals of Guangdong Province[M].Beijing:Geological Publishing House,1988.(in Chinese))
[2]地质矿产部《深圳市区域稳定性评价》编写组.深圳市区域稳定性评价[M].北京:地质出版社,1991.(Compilation Group of Assessment of the Crustal Stability of Shenzhen City,Ministry of Geology and Mineral Resources.Assessment of the Crustal Stability of Shenzhen City[M].Beijing:Geological Publishing House,1991.(in Chinese))
[3]王建军,张鸿旭,李荣强,等.深圳市罗湖断裂带活动性及建筑物安全监测系统设计[J].灾害学,2002,17(3):14-20.(Wang Jianjun,Zhang Hongxu,Li Rongqiang,et al.Activity of Luohu Fault Zone and design of building safety monitoring system in Shenzhen City[J].Journal of Catastrophology,2002,17(3):14-20.(in Chinese))
[4]康镇江,李作明.深圳(罗湖)—香港(元朗)断裂带的特征及其稳定性研究[J].中国地质灾害与防治学报,1998,9(增):168-174.(Kang Zhenjiang,Li Zuoming.The characteristic and stability studies on Shenzhen(Luohu)—Hong Kong(Yuen Long)fault belt[J].The Chinese Journal of Geological Hazard and Control,1998,9(Supp.):168-174.(in Chinese))
[5]陈伟光,赵红梅,李富光,等.深圳市断裂构造的活动性及其对地质环境的影响[J].热带地理,2001,21(1):45-50.(Chen Weiguang,Zhao Hongmei,Li Fuguang,et al.Fault activities and their influence upon geologic environment in Shenzhen City[J].Tropical Geography,2001,21(1):45-50.(in Chinese))
[6]唐诗佳,彭恩生,孙振家,等.断裂构造三维模型研究评述[J].地质科技情报,1999,18(2):23-26.(Tang Shijia,Peng Ensheng,Sun Zhenjia,et al.Overview about three-dimensional model studying in fault[J].Geological Science and Technology Information,1999,18(2):23-26.(in Chinese))
[7]朱伯芳.岩体初始地应力反分析[J].水利学报,1994,(10):30-35.(Zhu Bofang.Back analysis of initial stresses in rock masses[J].Journal of Hydraulic Engineering,1994,(10):30-35.(in Chinese))
[8]苏生瑞.断裂构造对地应力场的影响及其工程意义[J].岩石力学与工程学报,2002,21(2):296.(Su Shengrui.Effect of fractures on rock stresses and its significance in geological engineering[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(2):296.(in Chinese))
[9]Su S,Stephansson O.Effect of a fault on in-situ stresses studied by the distinct element method[J].International Journal of Rock Mechanics and Mining Sciences,1999,36(8):1 051-1 056.
[10]李天斌,徐进,任光明.西安地区断裂构造活动性的地质力学模拟研究[J].工程地质学报,1994,2(3):34-42.(Li Tianbin,Xu Jin,Ren Guangming.Study on geomechanical modeling of the fault activities in Xi′an Area[J].Journal of Engineering Geology,1994,2(3):34-42.(in Chinese))
[2]地质矿产部《深圳市区域稳定性评价》编写组.深圳市区域稳定性评价[M].北京:地质出版社,1991.(Compilation Group of Assessment of the Crustal Stability of Shenzhen City,Ministry of Geology and Mineral Resources.Assessment of the Crustal Stability of Shenzhen City[M].Beijing:Geological Publishing House,1991.(in Chinese))
[3]王建军,张鸿旭,李荣强,等.深圳市罗湖断裂带活动性及建筑物安全监测系统设计[J].灾害学,2002,17(3):14-20.(Wang Jianjun,Zhang Hongxu,Li Rongqiang,et al.Activity of Luohu Fault Zone and design of building safety monitoring system in Shenzhen City[J].Journal of Catastrophology,2002,17(3):14-20.(in Chinese))
[4]康镇江,李作明.深圳(罗湖)—香港(元朗)断裂带的特征及其稳定性研究[J].中国地质灾害与防治学报,1998,9(增):168-174.(Kang Zhenjiang,Li Zuoming.The characteristic and stability studies on Shenzhen(Luohu)—Hong Kong(Yuen Long)fault belt[J].The Chinese Journal of Geological Hazard and Control,1998,9(Supp.):168-174.(in Chinese))
[5]陈伟光,赵红梅,李富光,等.深圳市断裂构造的活动性及其对地质环境的影响[J].热带地理,2001,21(1):45-50.(Chen Weiguang,Zhao Hongmei,Li Fuguang,et al.Fault activities and their influence upon geologic environment in Shenzhen City[J].Tropical Geography,2001,21(1):45-50.(in Chinese))
[6]唐诗佳,彭恩生,孙振家,等.断裂构造三维模型研究评述[J].地质科技情报,1999,18(2):23-26.(Tang Shijia,Peng Ensheng,Sun Zhenjia,et al.Overview about three-dimensional model studying in fault[J].Geological Science and Technology Information,1999,18(2):23-26.(in Chinese))
[7]朱伯芳.岩体初始地应力反分析[J].水利学报,1994,(10):30-35.(Zhu Bofang.Back analysis of initial stresses in rock masses[J].Journal of Hydraulic Engineering,1994,(10):30-35.(in Chinese))
[8]苏生瑞.断裂构造对地应力场的影响及其工程意义[J].岩石力学与工程学报,2002,21(2):296.(Su Shengrui.Effect of fractures on rock stresses and its significance in geological engineering[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(2):296.(in Chinese))
[9]Su S,Stephansson O.Effect of a fault on in-situ stresses studied by the distinct element method[J].International Journal of Rock Mechanics and Mining Sciences,1999,36(8):1 051-1 056.
[10]李天斌,徐进,任光明.西安地区断裂构造活动性的地质力学模拟研究[J].工程地质学报,1994,2(3):34-42.(Li Tianbin,Xu Jin,Ren Guangming.Study on geomechanical modeling of the fault activities in Xi′an Area[J].Journal of Engineering Geology,1994,2(3):34-42.(in Chinese))
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