北京延庆新城规划区场地动力响应数值模拟
|
摘要
在地震多发的中国内陆环境下,场地稳定性评价越来越引起重视。为了研究北京延庆新城规划区大型场地动力响应特征,在分析延庆新城规划区第四纪覆盖层和断裂的空间分布规律基础上,基于数值模拟方法,运用有限差分数值模拟软件FLAC3D建立了规划区三维仿真模型,并对新城规划区场地动力响应进行了仿真,最后通过定义场地速度响应系数来刻画场地动力响应特征。结果表明:对于"土岩组合"的典型场地,在低频剪切波的激励下,第四纪覆盖层的厚度将引起不同程度的场地速度响应,第四纪覆盖层越厚,场地速度响应系数越大,动力放大程度越高;对于下伏断裂的复杂场地,剪切波传播路径变得极其复杂,断裂对地表速度响应系数有放大作用,放大程度与断裂分布形式和发展规模有关。
In the earthquake prone inland environment of China,the evaluation of site stability has drawn more and more attention.For the study of large site dynamic response characteristics of Yanqing new city planning region,this paper firstly found out the Quaternary overburden layer and the spatial distribution of fractures in Yanqing new city planning region;secondly,it established a 3D simulation model for planning region using FLAC3 Dbased on numerical simulation;thirdly,it made a simulation of the site dynamic response in planning region;and lastly,it described the characteristics of site dynamic response by defining the coefficient of site speed response.The results reveal the following aspects:in the typical sites of soil-rock composite,different thicknesses of the Quaternary overburden layer could lead to different levels of site speed response under the low-frequency shear-wave excitation,and while the Quaternary overburden layer gets thicker,the coefficient of site speed response gets greater and the degree of dynamic amplification gets higher;in the complex site of underlying fracture,the shear wave propagation path becomes very complicated,and the fracture has an amplification effect to the coefficient of surface speed response,while the amplification level is related with the distribution form and development scale of fractures.
In the earthquake prone inland environment of China,the evaluation of site stability has drawn more and more attention.For the study of large site dynamic response characteristics of Yanqing new city planning region,this paper firstly found out the Quaternary overburden layer and the spatial distribution of fractures in Yanqing new city planning region;secondly,it established a 3D simulation model for planning region using FLAC3 Dbased on numerical simulation;thirdly,it made a simulation of the site dynamic response in planning region;and lastly,it described the characteristics of site dynamic response by defining the coefficient of site speed response.The results reveal the following aspects:in the typical sites of soil-rock composite,different thicknesses of the Quaternary overburden layer could lead to different levels of site speed response under the low-frequency shear-wave excitation,and while the Quaternary overburden layer gets thicker,the coefficient of site speed response gets greater and the degree of dynamic amplification gets higher;in the complex site of underlying fracture,the shear wave propagation path becomes very complicated,and the fracture has an amplification effect to the coefficient of surface speed response,while the amplification level is related with the distribution form and development scale of fractures.
引文
[1]Kasgin Khaheshi Banab,Michal Kolaj,Dariush Motazedian,et al.Seismic site response analysis for Ottawa,Canada:a comprehensive study using measurements and numerical simulations[J].Bulletin of the Seismological Society of America,2012,102(5):1976-1993.
[2]Bernardie S,Foerster E,Modaressi H.Non-linear site response simulations in Chang-Hwa Region during the 1999 Chi-Chi Earthquake,Taiwan[J].Soil Dynamics and Earthquake Engineering,2006,26(11):1038-1048.
[3]Roy N,Sahu R B.Site specific ground motion simulation and seismic response analysis for microzonation of Kolkata[J].Geomechanics and Engineering,2012,4(1):1-18.
[4]孙进忠.岩土体动力学体系框架及若干问题的研究与应用[J].岩石力学与工程学报,2002,21(9):1433-1434.
[5]孙进忠,谭捍华.影响强夯地面振动衰减的因素分析[J].现代地质,2000,14(2):230-234.
[6]彭一民.地震地面效应数值分析与模型实验简介[J].现代地质,1987,1(2):274-278.
[7]黄润秋,余嘉顺.软弱夹层的地震动强度效应研究[J].自然科学进展,2003,13(11):1177-1181.
[8]苏海.复杂场地条件下地震动空间效应研究[J].地球物理学进展,2012,27(3):908-916.
[9]杨翔,柯朝辉.夹软弱土层的层状场地对入射P-SV波的响应分析[J].中国水运,2007,7(5):90-92.
[10]祁生文,伍法权,孙进忠.边坡动力响应规律研究[J].中科科学:E辑,2003,33(增刊):28-40.
[11]陈镕,陈竹昌,薛松涛,等.夹有软弱土层的层状场地对入射SH波的响应分析[J].岩石力学与工程学报,1999,18(2):161-165.
[12]石玉成,王兰民,林学文.黄土场地的爆破地震振动效应[J].岩石力学与工程学报,2003,22(11):1933-1938.
[13]刘红帅,唐立强,刘德东,等.基岩场地软弱夹层对地表峰值加速度的影响[J].工程地质学报,2008,16(增刊):0612-05.
[14]梁建文,冯领香,巴振宁.含断层破碎带场地对平面SH波的放大作用[J].地震学报,2010,32(3):300-309.
[15]梁建文,冯领香,巴振宁.局部断层场地对P波的散射影响研究[J].岩土力学,2011,32(1):244-252.
[16]黄骁.北京延庆规划新城工程地质环境与建设适宜性研究[D].北京:中国地质大学(北京),2013.
[17]贾晓亮,崔洪庆,张子敏,等.断层端部地应力影响因素数值分析[J].煤田地质与勘探,2010,38(4):47-51.
[18]赵雷,李小军,霍达.数值模拟软夹层对基岩上覆土层破裂的影响[J].北京工业大学学报,2007,33(3):289-292.
[19]许建聪,简文彬,尚岳全.深厚软土地层地震破坏的作用机理研究[J].岩石力学与工程学报,2005,24(2):313-319.
[20]陈拓,吴志坚,马巍,等.黄土地区场地条件对地震动放大效应影响研究[J].地下空间与工程学报,2012,8(5):969-973.
[2]Bernardie S,Foerster E,Modaressi H.Non-linear site response simulations in Chang-Hwa Region during the 1999 Chi-Chi Earthquake,Taiwan[J].Soil Dynamics and Earthquake Engineering,2006,26(11):1038-1048.
[3]Roy N,Sahu R B.Site specific ground motion simulation and seismic response analysis for microzonation of Kolkata[J].Geomechanics and Engineering,2012,4(1):1-18.
[4]孙进忠.岩土体动力学体系框架及若干问题的研究与应用[J].岩石力学与工程学报,2002,21(9):1433-1434.
[5]孙进忠,谭捍华.影响强夯地面振动衰减的因素分析[J].现代地质,2000,14(2):230-234.
[6]彭一民.地震地面效应数值分析与模型实验简介[J].现代地质,1987,1(2):274-278.
[7]黄润秋,余嘉顺.软弱夹层的地震动强度效应研究[J].自然科学进展,2003,13(11):1177-1181.
[8]苏海.复杂场地条件下地震动空间效应研究[J].地球物理学进展,2012,27(3):908-916.
[9]杨翔,柯朝辉.夹软弱土层的层状场地对入射P-SV波的响应分析[J].中国水运,2007,7(5):90-92.
[10]祁生文,伍法权,孙进忠.边坡动力响应规律研究[J].中科科学:E辑,2003,33(增刊):28-40.
[11]陈镕,陈竹昌,薛松涛,等.夹有软弱土层的层状场地对入射SH波的响应分析[J].岩石力学与工程学报,1999,18(2):161-165.
[12]石玉成,王兰民,林学文.黄土场地的爆破地震振动效应[J].岩石力学与工程学报,2003,22(11):1933-1938.
[13]刘红帅,唐立强,刘德东,等.基岩场地软弱夹层对地表峰值加速度的影响[J].工程地质学报,2008,16(增刊):0612-05.
[14]梁建文,冯领香,巴振宁.含断层破碎带场地对平面SH波的放大作用[J].地震学报,2010,32(3):300-309.
[15]梁建文,冯领香,巴振宁.局部断层场地对P波的散射影响研究[J].岩土力学,2011,32(1):244-252.
[16]黄骁.北京延庆规划新城工程地质环境与建设适宜性研究[D].北京:中国地质大学(北京),2013.
[17]贾晓亮,崔洪庆,张子敏,等.断层端部地应力影响因素数值分析[J].煤田地质与勘探,2010,38(4):47-51.
[18]赵雷,李小军,霍达.数值模拟软夹层对基岩上覆土层破裂的影响[J].北京工业大学学报,2007,33(3):289-292.
[19]许建聪,简文彬,尚岳全.深厚软土地层地震破坏的作用机理研究[J].岩石力学与工程学报,2005,24(2):313-319.
[20]陈拓,吴志坚,马巍,等.黄土地区场地条件对地震动放大效应影响研究[J].地下空间与工程学报,2012,8(5):969-973.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心