渤海海峡跨海通道地震安全性评价探讨
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摘要
辽东半岛、山东半岛间的岛链是中国东部大陆架后部翘起的部分,郯庐断裂带的切割把此大陆架与大陆部分分割开来,大陆架向东倾没海中,郯庐带下沉.渤海海峡跨海通道的西侧有郯庐带,此带是一条强震发生断层,强震频繁,最大达8.5级,给未来通道造成一定的地震影响,所以通道的设计和施工应防范于未然.强震发生断层有一定宽度并分界明显,断层内外地震动峰值加速度差异甚大,地震烈度差异可达2—3度或更高.跨海通道是一条生命线工程,对通道的设计,地震动参数的采取应用确定性方法,为跨海通道工程建设提供翔实依据.
The island chain between the Liaodong Peninsula and Shandong Peninsula is an uplifted part of the continental shelf of eastern China.The Tanlu fault zone separates this shelf from the mainland of China,which subducts toward east into the sea,while the Tanlu fault zone is sinking.West of the planned Trans-strait Passage of the Bohai Strait,the Tanlu fault is highly active with frequent earthquakes which can reach 8.5 in magnitude.Thus the design and construction of this trans-strait passage must consider the earthquake hazard.The seismogenic fault has a certain width and clear boundaries.The possible peak accelerations of seismic ground motion are quite different inside and outside the fault,and their seismic intensities may differ as much as 2—3 degrees or more.The trans-strait passage is a lifeline engineering.Fortunately,it is about 40km away from the Tanlu fault zone.It is better to use the deterministic method to evaluate the seismic motion parameters in the design of the passage.
The island chain between the Liaodong Peninsula and Shandong Peninsula is an uplifted part of the continental shelf of eastern China.The Tanlu fault zone separates this shelf from the mainland of China,which subducts toward east into the sea,while the Tanlu fault zone is sinking.West of the planned Trans-strait Passage of the Bohai Strait,the Tanlu fault is highly active with frequent earthquakes which can reach 8.5 in magnitude.Thus the design and construction of this trans-strait passage must consider the earthquake hazard.The seismogenic fault has a certain width and clear boundaries.The possible peak accelerations of seismic ground motion are quite different inside and outside the fault,and their seismic intensities may differ as much as 2—3 degrees or more.The trans-strait passage is a lifeline engineering.Fortunately,it is about 40km away from the Tanlu fault zone.It is better to use the deterministic method to evaluate the seismic motion parameters in the design of the passage.
引文
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[2]邓起东.中国活动构造图[M].北京:地震出版社,2007.
[3]国家地震局分析预报中心.中国地震震中分布图[Z].北京:中国地图出版社,1990.
[4]魏光兴,习守中,周翠英.郯庐带地震活动性研究[M],北京:地震出版社,1993:14.
[5]徐杰,张进,周本刚,等.渤海东南部NE向黄河口—庙西北新生断裂带的存在[J].地震地质,2007,29(4):845—854.
[6]李?,刘行松,杨美娥,等.昔格达层构造变形形成因素分析[J].中国地震,1985,1(3):39—46.
[7]李?,李愿军.长江三峡坝区地壳稳定性研究[J].中国工程科学,2004,6(6):26—34.
[8]国家地震局地质研究所.中国八大地震震害摄影图集[Z].北京:地震出版社,1983.
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