天津滨海场地土动力学参数研究
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摘要
天津滨海地区是典型的软土区,属晚第四系以来的浅海相沉积软土。本文收集了该地区地震安全性评价报告中的土动力学参数的实验资料,并补充了15个钻孔的测试实验,统计分析了淤泥质粘土、淤泥质粉质粘土、粉土、粉质粘土、粘土、粉砂、细砂等7种土类的实测土动力学参数,给出了它们在不同深度下的动剪切模量比和阻尼比的统计值。然后,选取了2个典型钻孔并建立了土层地震反应分析模型,分别运用本文统计值、94规范值和袁晓铭等(2000)的推荐值进行土层地震反应计算,从反应谱形状、地表峰值加速度和反应谱特征周期等方面说明了本文统计值的适用性和针对性。本文的研究成果对天津滨海地区各类工程建设的场地地震安全性评价工作具有一定的借鉴和参考价值,且有利于该地区工程场地地震安全性评价工作的开展。
Tianjin coastal area is a typical soft soil site region,where the soil is marine deposit since late Quaternary.In this paper,soil dynamic parameters from seismic risk assessment reports are collected,and dynamic characteristics of samples from 15 drilling holes are measured and analyzed.The data in this study are divided into 7 types based on lithology,i.e.muddy clay,muddy silty clay,silt,silty clay,clay,silty sand and fine sand.Statistics of the dynamic parameters of these soils are carried out to obtain the mean values of dynamic shear modulus ratio and damping ratio at different depth.Then two typical drilling are selected to establish soil dynamic models in order to investigate the seismic response in different cases.The dynamic parameters in the models are taken from statistical values in this study,recommended values in 94 Code and recommended values by Yuan Xiaoming respectively.The applicability and pertinence of the statistical value obtained in this paper are demonstrated by the response spectrum shape,peak ground acceleration and response spectral characteristics.Our results can be taken as a reference of the soil dynamic value in this area and can be used in seismic risk assessment of engineering projects.
Tianjin coastal area is a typical soft soil site region,where the soil is marine deposit since late Quaternary.In this paper,soil dynamic parameters from seismic risk assessment reports are collected,and dynamic characteristics of samples from 15 drilling holes are measured and analyzed.The data in this study are divided into 7 types based on lithology,i.e.muddy clay,muddy silty clay,silt,silty clay,clay,silty sand and fine sand.Statistics of the dynamic parameters of these soils are carried out to obtain the mean values of dynamic shear modulus ratio and damping ratio at different depth.Then two typical drilling are selected to establish soil dynamic models in order to investigate the seismic response in different cases.The dynamic parameters in the models are taken from statistical values in this study,recommended values in 94 Code and recommended values by Yuan Xiaoming respectively.The applicability and pertinence of the statistical value obtained in this paper are demonstrated by the response spectrum shape,peak ground acceleration and response spectral characteristics.Our results can be taken as a reference of the soil dynamic value in this area and can be used in seismic risk assessment of engineering projects.
引文
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陈宇坤,李振海,邵永新等,2008.天津地区第四纪年代地层剖面研究.地震地质,30(2):383—399.
兰青龙,贺明华,1997.太原地区场地土动力性能的统计分析.山西地震,(3):6—11.
吕悦军,唐荣余,沙海军,2003.渤海海底土类动剪切模量比和阻尼比试验研究.防灾减灾工程学报,23(2):368—374.
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杨锦贤,1994.天津海岸带经济开发的地址环境和环境工程地质问题.海洋开发与管理,11(3):36—40.
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张效龙,金永德,孙永福等,2005.天津滨海滩涂土动剪切模量比和阻尼比试验.海洋地质动态,21(8):27—30.
张效龙,徐家升,刘敦武,2008.河口滨海区浅层海积软土工程特性研究.东华理工大学学报(自然科学版),31(3):259—264.
中华人民共和国地震行业标准,1994.工程场地地震安全性评价工作规范(DB001-94).北京:地震出版社.
中华人民共和国国家标准,2002.建筑抗震设计规范(GB50011-2002).北京:中国建筑工业出版社.
陈宇坤,李振海,邵永新等,2008.天津地区第四纪年代地层剖面研究.地震地质,30(2):383—399.
兰青龙,贺明华,1997.太原地区场地土动力性能的统计分析.山西地震,(3):6—11.
吕悦军,唐荣余,沙海军,2003.渤海海底土类动剪切模量比和阻尼比试验研究.防灾减灾工程学报,23(2):368—374.
天津市抗震办公室,1984.唐山大地震天津市工程震害.天津:天津科学技术出版社.
邢恩桥,徐国辉,胡广海等,2005.天津沿海地层工程地质性质统计特征.海岸工程,24(1):48—52.
杨锦贤,1994.天津海岸带经济开发的地址环境和环境工程地质问题.海洋开发与管理,11(3):36—40.
袁晓铭,孙锐,孙静等,2000.常规土类动剪切魔量比和阻尼比试验研究.地震工程与工程振动,20(4):133—139.
张效龙,金永德,孙永福等,2005.天津滨海滩涂土动剪切模量比和阻尼比试验.海洋地质动态,21(8):27—30.
张效龙,徐家升,刘敦武,2008.河口滨海区浅层海积软土工程特性研究.东华理工大学学报(自然科学版),31(3):259—264.
中华人民共和国地震行业标准,1994.工程场地地震安全性评价工作规范(DB001-94).北京:地震出版社.
中华人民共和国国家标准,2002.建筑抗震设计规范(GB50011-2002).北京:中国建筑工业出版社.
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