珊瑚岛礁场地地震反应分析初探
发布时间：2019-07-02 16:28
【摘要】：随着南海珊瑚岛礁工程的不断兴建,为尽量减少地震灾害带来的经济损失,对珊瑚岛礁场地抗震设防的研究刻不容缓。目前国内还没有岛礁场地抗震设计规范,岛礁场地工程设计参数的估计需要了解经土层反应后的地震动特征参数,本文研究围绕珊瑚岛礁场地土层地震反应特征分析展开,主要研究内容和结论如下:1.总结了国内外关于珊瑚礁工程地质的研究现状和场地条件对地震反应影响的研究现状。并介绍了我国南海海域地震烈度区划和南海海域地震地质构造情况。2.采用频域等效线性化波动分析方法,使用一维土层场地地震反应分析软件DEEPSOIL进行土层反应计算。国内外对珊瑚礁工程地质的研究现状表明,珊瑚礁场地覆盖层主要由钙质砂和珊瑚碎屑组成,颗粒坚硬易破碎,无软弱夹层,且各层剪切波速没有随着深度增加而规律性变化的情况。参照珊瑚礁实地钻孔测得参数,包含土层厚度、埋深、密度和剪切波速的物理力学参数及复杂应力条件下饱和钙质砂动力特性实验研究得到的剪切模量比变化曲线G/Gmax-γ和阻尼比变化曲线λ-γ,建立了珊瑚岛礁进行一维场地地震分析所需的土层剖面模型。3.选取6个位于日本房总半岛沿海地区海平面以下900m-2339m的台站记录的海底地震动记录,根据震源深度不同将地震动记录归为浅源地震动和中深源地震动两组。分析了在这两个对照组的地震动作用下的珊瑚岛礁场地地表加速度峰值(PGA)、根据美国FEMA-450(2003)法求得的地表加速度反应谱特征周期(Tg)、地表与基岩地震动加速度反应谱之比等地震动参数。得到珊瑚礁场地对中深源海底地震动的放大倍数大于对浅源地震动的放大倍数的结论。4.根据能量持时计算方法,选取大量东日本大地震5%-95%能量持时大于140s的地震动记录,分析了在长持时地震动作用下的珊瑚岛礁场地地表加速度峰值(PGA)、地表加速度反应谱特征周期(Tg)、地表与基岩地震动加速度反应谱之比,及地表输出地震动的能量持时等地震动参数。5.选取大量近断层脉冲型地震动记录作为基岩输入的强震数据库,分析了以上经过土层地震反应计算得到的地震动参数。结合海底、长持时、脉冲型地震动作用分析结果表明:地表加速度反应谱特征周期与震源深度、基岩地震动持时及场地土层结构有较大相关性;珊瑚礁地表加速度的峰值(PGA)受输入地震动种类影响不是很大,受场地土层结构影响较大。
[Abstract]:With the continuous construction of the coral reef project of the South China Sea, the research on the anti-seismic fortification of the coral reef site is urgent to minimize the economic loss caused by the earthquake disaster. At present, there is no seismic design code of the island reef site in China. The estimation of the design parameters of the island reef site is to know the ground motion characteristic parameters after the soil layer reaction. The research on the characteristics of the seismic response of the soil layer surrounding the coral reef site is carried out. The main research contents and conclusions are as follows:1. The present situation of the research on the engineering geology of coral reefs and the status of the site conditions on the effects of the site on the response of the earthquake are summarized. The seismic intensity division of the South China Sea and the seismic geological structure of the South China Sea are also introduced. Using the frequency-domain equivalent linearization fluctuation analysis method, the soil-layer reaction calculation was carried out using the one-dimensional soil site seismic response analysis software, DEEPSOIL. The research status of the coral reef engineering geology at home and abroad shows that the cover layer of the coral reef is mainly composed of calcareous sand and coral debris, the particles are hard and easy to break, and there is no soft interlayer, and the shear wave velocity of each layer does not change regularly with the increase of the depth. referring to the measured parameters of the field drilling of the coral reef, the shear modulus ratio variation curve G/ Gmax-1 and the damping ratio change curve G-2 obtained by the experimental study of the physical and mechanical parameters including the soil layer thickness, the buried depth, the density and the shear wave velocity, and the dynamic characteristics of the saturated calcareous sand under the complex stress condition, The soil-soil profile model is established for the one-dimensional site seismic analysis of the coral reef. The seismic records of the seabed in six stations, which are located at the sea level of 900m-2339m below the sea level in the coastal area of the general peninsula of Japan, are selected, and the ground motion records are classified into two groups of shallow source vibration and middle-deep source vibration according to the different source depth. The surface acceleration peak value (PGA) of the coral island reef site under the ground motion of the two control groups was analyzed, and the vibration parameters such as the ratio of the surface acceleration response spectrum characteristic period (Tg), the ground surface and the seismic acceleration response spectrum of the bedrock were determined according to the American FEMA-450 (2003) method. And a conclusion that the amplification factor of the ground motion of the deep source of the coral reef site is larger than the amplification factor of the vibration of the shallow source is obtained. The surface acceleration peak (PGA) and the surface acceleration response spectrum characteristic period (Tg) of the coral island reef site under long-time vibration were analyzed according to the energy-holding calculation method. The ratio of the ground surface to the seismic acceleration response spectrum of the bedrock, and the vibration parameters such as the energy holding of the ground surface output ground and the like. A large number of near-fault pulse-type ground motion records are selected as the strong-motion data base for bedrock input, and the ground motion parameters obtained by the above-mentioned earth-layer seismic response are analyzed. The results show that the characteristic period of the surface acceleration response spectrum is closely related to the depth of the source, the ground motion of the bedrock and the structure of the soil layer. The peak value (PGA) of the surface acceleration of the coral reef is not influenced by the input vibration type, and is affected by the structure of the site soil layer.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P75;TU435
本文编号：2509088
[Abstract]:With the continuous construction of the coral reef project of the South China Sea, the research on the anti-seismic fortification of the coral reef site is urgent to minimize the economic loss caused by the earthquake disaster. At present, there is no seismic design code of the island reef site in China. The estimation of the design parameters of the island reef site is to know the ground motion characteristic parameters after the soil layer reaction. The research on the characteristics of the seismic response of the soil layer surrounding the coral reef site is carried out. The main research contents and conclusions are as follows:1. The present situation of the research on the engineering geology of coral reefs and the status of the site conditions on the effects of the site on the response of the earthquake are summarized. The seismic intensity division of the South China Sea and the seismic geological structure of the South China Sea are also introduced. Using the frequency-domain equivalent linearization fluctuation analysis method, the soil-layer reaction calculation was carried out using the one-dimensional soil site seismic response analysis software, DEEPSOIL. The research status of the coral reef engineering geology at home and abroad shows that the cover layer of the coral reef is mainly composed of calcareous sand and coral debris, the particles are hard and easy to break, and there is no soft interlayer, and the shear wave velocity of each layer does not change regularly with the increase of the depth. referring to the measured parameters of the field drilling of the coral reef, the shear modulus ratio variation curve G/ Gmax-1 and the damping ratio change curve G-2 obtained by the experimental study of the physical and mechanical parameters including the soil layer thickness, the buried depth, the density and the shear wave velocity, and the dynamic characteristics of the saturated calcareous sand under the complex stress condition, The soil-soil profile model is established for the one-dimensional site seismic analysis of the coral reef. The seismic records of the seabed in six stations, which are located at the sea level of 900m-2339m below the sea level in the coastal area of the general peninsula of Japan, are selected, and the ground motion records are classified into two groups of shallow source vibration and middle-deep source vibration according to the different source depth. The surface acceleration peak value (PGA) of the coral island reef site under the ground motion of the two control groups was analyzed, and the vibration parameters such as the ratio of the surface acceleration response spectrum characteristic period (Tg), the ground surface and the seismic acceleration response spectrum of the bedrock were determined according to the American FEMA-450 (2003) method. And a conclusion that the amplification factor of the ground motion of the deep source of the coral reef site is larger than the amplification factor of the vibration of the shallow source is obtained. The surface acceleration peak (PGA) and the surface acceleration response spectrum characteristic period (Tg) of the coral island reef site under long-time vibration were analyzed according to the energy-holding calculation method. The ratio of the ground surface to the seismic acceleration response spectrum of the bedrock, and the vibration parameters such as the energy holding of the ground surface output ground and the like. A large number of near-fault pulse-type ground motion records are selected as the strong-motion data base for bedrock input, and the ground motion parameters obtained by the above-mentioned earth-layer seismic response are analyzed. The results show that the characteristic period of the surface acceleration response spectrum is closely related to the depth of the source, the ground motion of the bedrock and the structure of the soil layer. The peak value (PGA) of the surface acceleration of the coral reef is not influenced by the input vibration type, and is affected by the structure of the site soil layer.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P75;TU435
【参考文献】
相关期刊论文 前10条
1 周宝峰;温瑞智;谢礼立;;强震记录中的“尖刺”现象初步研究[J];土木工程学报;2014年S2期
2 崔永圣;马林;刘宏岳;黄佳坤;;珊瑚岛礁工程地球物理方法初探[J];岩土力学;2014年S2期
3 胡进军;郝彦春;谢礼立;;潜在地震对我国南海开发和建设影响的初步考虑[J];地震工程学报;2014年03期
4 张耀光;刘锴;刘桂春;;从地图看中国南海海域疆界线的形成与演进——中国南海九条断续国界线[J];地理科学;2012年09期
5 朱伟林;张功成;钟锴;刘宝明;;中国南海油气资源前景[J];中国工程科学;2010年05期
6 刘文锋;付兴潘;于振兴;陈学中;张辛;;反应谱特征周期的统计分析[J];青岛理工大学学报;2009年05期
7 魏柏林;康英;陈玉桃;李宏志;;南海地震与海啸[J];华南地震;2006年01期
8 徐杰,高祥林,陈国光,周本刚;2004年12月26日印度尼西亚8.7级大地震构造背景的初步分析[J];地震地质;2005年02期
9 薄景山,翟庆生,吴兆营,齐文浩;基于土层结构的场地分类方法[J];地震工程与工程振动;2004年04期
10 方炜,吴富春,张春生,刘春,邵辉成;中国及其周邻地区中深源地震的活动特征分析[J];地震研究;2003年04期
相关博士学位论文 前2条
1 胡进军;近断层地震动方向性效应及超剪切破裂研究[D];中国地震局工程力学研究所;2009年
2 李建国;波浪荷载作用下饱和钙质砂动力特性的试验研究[D];中国科学院研究生院（武汉岩土力学研究所）;2005年
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