珊瑚島礁場地地震反應(yīng)分析初探
發(fā)布時(shí)間：2019-07-02 16:28
【摘要】：隨著南海珊瑚島礁工程的不斷興建,為盡量減少地震災(zāi)害帶來的經(jīng)濟(jì)損失,對珊瑚島礁場地抗震設(shè)防的研究刻不容緩。目前國內(nèi)還沒有島礁場地抗震設(shè)計(jì)規(guī)范,島礁場地工程設(shè)計(jì)參數(shù)的估計(jì)需要了解經(jīng)土層反應(yīng)后的地震動(dòng)特征參數(shù),本文研究圍繞珊瑚島礁場地土層地震反應(yīng)特征分析展開,主要研究內(nèi)容和結(jié)論如下:1.總結(jié)了國內(nèi)外關(guān)于珊瑚礁工程地質(zhì)的研究現(xiàn)狀和場地條件對地震反應(yīng)影響的研究現(xiàn)狀。并介紹了我國南海海域地震烈度區(qū)劃和南海海域地震地質(zhì)構(gòu)造情況。2.采用頻域等效線性化波動(dòng)分析方法,使用一維土層場地地震反應(yīng)分析軟件DEEPSOIL進(jìn)行土層反應(yīng)計(jì)算。國內(nèi)外對珊瑚礁工程地質(zhì)的研究現(xiàn)狀表明,珊瑚礁場地覆蓋層主要由鈣質(zhì)砂和珊瑚碎屑組成,顆粒堅(jiān)硬易破碎,無軟弱夾層,且各層剪切波速?zèng)]有隨著深度增加而規(guī)律性變化的情況。參照珊瑚礁實(shí)地鉆孔測得參數(shù),包含土層厚度、埋深、密度和剪切波速的物理力學(xué)參數(shù)及復(fù)雜應(yīng)力條件下飽和鈣質(zhì)砂動(dòng)力特性實(shí)驗(yàn)研究得到的剪切模量比變化曲線G/Gmax-γ和阻尼比變化曲線λ-γ,建立了珊瑚島礁進(jìn)行一維場地地震分析所需的土層剖面模型。3.選取6個(gè)位于日本房總半島沿海地區(qū)海平面以下900m-2339m的臺(tái)站記錄的海底地震動(dòng)記錄,根據(jù)震源深度不同將地震動(dòng)記錄歸為淺源地震動(dòng)和中深源地震動(dòng)兩組。分析了在這兩個(gè)對照組的地震動(dòng)作用下的珊瑚島礁場地地表加速度峰值(PGA)、根據(jù)美國FEMA-450(2003)法求得的地表加速度反應(yīng)譜特征周期(Tg)、地表與基巖地震動(dòng)加速度反應(yīng)譜之比等地震動(dòng)參數(shù)。得到珊瑚礁場地對中深源海底地震動(dòng)的放大倍數(shù)大于對淺源地震動(dòng)的放大倍數(shù)的結(jié)論。4.根據(jù)能量持時(shí)計(jì)算方法,選取大量東日本大地震5%-95%能量持時(shí)大于140s的地震動(dòng)記錄,分析了在長持時(shí)地震動(dòng)作用下的珊瑚島礁場地地表加速度峰值(PGA)、地表加速度反應(yīng)譜特征周期(Tg)、地表與基巖地震動(dòng)加速度反應(yīng)譜之比,及地表輸出地震動(dòng)的能量持時(shí)等地震動(dòng)參數(shù)。5.選取大量近斷層脈沖型地震動(dòng)記錄作為基巖輸入的強(qiáng)震數(shù)據(jù)庫,分析了以上經(jīng)過土層地震反應(yīng)計(jì)算得到的地震動(dòng)參數(shù)。結(jié)合海底、長持時(shí)、脈沖型地震動(dòng)作用分析結(jié)果表明:地表加速度反應(yīng)譜特征周期與震源深度、基巖地震動(dòng)持時(shí)及場地土層結(jié)構(gòu)有較大相關(guān)性;珊瑚礁地表加速度的峰值(PGA)受輸入地震動(dòng)種類影響不是很大,受場地土層結(jié)構(gòu)影響較大。
[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.
【學(xué)位授予單位】：中國地震局工程力學(xué)研究所
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P75;TU435
本文編號(hào)：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.
【學(xué)位授予單位】：中國地震局工程力學(xué)研究所
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P75;TU435
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