断裂活动性及地质灾害效应分析——以深圳市罗湖区F_8断裂为例
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摘要
通过断层泥中石英的热释光年龄测试、研究区的地震历史资料分析、断裂的位移监测数据分析等手段对深圳市罗湖区F8断裂的现今活动性进行了评价,结果表明:该断裂的活动性介于微弱全新活动断裂与中等全新活动断裂之间;F8断裂的活动速率与地裂缝的位移量在近期内呈相似的变化趋势,则表明地裂缝的形成与发展过程受到F8断裂控制。利用GM(1,1)模型对地裂缝位移量的发展趋势进行了预测,预测结果指示其位移量在今后一段时间内将继续增大,因此,应加强区内的主要建筑物与地面的变形监测,并避免在F8断裂的展布区内兴建大型的工程建筑,为区内的建筑物安全提供保障。
F8 fault in Shenzhen City(namely Huangbeiling fault) is the major fault of Luohu fault zone,and the discretely distributed geofracture has been found along the fault.A variety of methods including the thermoluminescence age measurement of quartz in fault clay,the historical seismic data analysis and the fault displacement monitoring were employed to evaluate the modern activity of F8 fault,and the results indicate that its activity in Holocene was between the faint fault grade and the moderate fault grade.In recent years,the change trend of the geofracture displacement is in accordance with that of the activity rate of F8 fault,which means that the forming and the development of the former has been controlled by the latter.Furthermore,the development trend of the geofracture displacement is forecasted using GM(1,1) model,and the results denote that the displacement will increase in future.Thus,the monitoring for the deformation of ground surface and major buildings in F8 fault zone should be strengthened,and the construction of large-scale engineering works should be kept far away from F8 fault zone,which is very helpful for the security of the major buildings in the study area.
F8 fault in Shenzhen City(namely Huangbeiling fault) is the major fault of Luohu fault zone,and the discretely distributed geofracture has been found along the fault.A variety of methods including the thermoluminescence age measurement of quartz in fault clay,the historical seismic data analysis and the fault displacement monitoring were employed to evaluate the modern activity of F8 fault,and the results indicate that its activity in Holocene was between the faint fault grade and the moderate fault grade.In recent years,the change trend of the geofracture displacement is in accordance with that of the activity rate of F8 fault,which means that the forming and the development of the former has been controlled by the latter.Furthermore,the development trend of the geofracture displacement is forecasted using GM(1,1) model,and the results denote that the displacement will increase in future.Thus,the monitoring for the deformation of ground surface and major buildings in F8 fault zone should be strengthened,and the construction of large-scale engineering works should be kept far away from F8 fault zone,which is very helpful for the security of the major buildings in the study area.
引文
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[2]汪华斌,吴树仁,吕贻峰,等.湖北西部恩施断裂活动性评价[J].地震地质,1998,20(3):213-248.
[3]李步云,王连权.祁连山—河西走廊地区断裂活动性评价[J].高原地震,1997,11(1):32-36.
[4]李愿军.反常系数法在三峡地区断裂活动性评价中的应用[J].水利学报,1997,(2):39-44.
[5]章振铨,李志田,迟天峰.敦化—密山断裂带(二道甸子—大山嘴子段)断裂活动性评价[J].吉林地质,1999,18(1):51-56.
[6]邓聚龙.灰理论基础[M].武汉:华中科技大学出版社,2002.1-496.
[7]易德生,郭萍.灰色理论与方法——提要.题解.程序.应用[M].北京:石油工业出版社,1992.
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