本文關(guān)鍵詞： 南京飽和細(xì)砂 液化流動(dòng)特大變形 剪切模量衰減 循環(huán)加載幅值 初始剪應(yīng)力比　出處：《巖土力學(xué)》2017年12期 　論文類型：期刊論文

【摘要】：針對(duì)南京飽和細(xì)砂液化后特大變形條件下(雙幅剪應(yīng)變接近100%)應(yīng)力-應(yīng)變關(guān)系特征,分析了有效圍壓和初始靜剪應(yīng)力比等因素對(duì)南京飽和細(xì)砂初始液化后特大變形條件下應(yīng)力-應(yīng)變關(guān)系曲線的影響規(guī)律,即在液化后多次循環(huán)加載條件下零有效應(yīng)力階段、剪脹階段和反向卸載階段的剪切模量隨單向流動(dòng)累積變形的衰減特征。結(jié)果表明:有效圍壓、初始靜剪應(yīng)力和循環(huán)加載幅值對(duì)南京飽和細(xì)砂初始液化后特大變形條件下應(yīng)力-應(yīng)變關(guān)系曲線在零有效應(yīng)力階段和剪脹階段的剪切模量大小及其衰減特征的影響不明顯,而對(duì)反向卸載階段的剪切模量大小和衰減特征的影響相對(duì)較大。隨著有效圍壓和加載幅值分別增大,南京飽和細(xì)砂初始液化后特大變形條件下應(yīng)力-應(yīng)變關(guān)系曲線反向卸載階段剪切模量都有明顯增大的趨勢(shì),同時(shí)其剪切模量隨后續(xù)循環(huán)加載次數(shù)的衰減速度也變快。但隨著初始剪應(yīng)力的增大,該階段剪切模量隨后續(xù)循環(huán)加載次數(shù)的衰減速度有減慢的趨勢(shì)。同時(shí),基于試驗(yàn)結(jié)果,給出了南京飽和細(xì)砂初始液化后特大變形條件下應(yīng)力-應(yīng)變關(guān)系曲線在不同階段的剪切模量與單向流動(dòng)累積變形有關(guān)的衰減函數(shù)及其擬合參數(shù)確定方法。
[Abstract]:According to the Nanjing post liquefaction saturated fine sand under the condition of large deformation (twin shear strain 100%) stress-strain relationship characteristics analysis of the effective confining pressure and initial static shear stress ratio and other factors on Nanjing saturated fine sand under the condition of large deformation after initial liquefaction stress-strain curve of the influence of the after repeated liquefaction under cyclic loading conditions of zero effective stress stage, the attenuation characteristics of the shear modulus and shear dilatancy phase reverse unloading stage with one-way flow of accumulated deformation. The results show that the effective confining pressure, stress amplitude and cyclic loading on Nanjing saturated fine sand under the condition of large deformation after initial liquefaction stress-strain curve at zero effective shear modulus and shear force size stage and expansion stage and its effect is not obvious attenuation characteristics of initial static shear, while the reverse unloading stage of shear modulus size and attenuation characteristics with relatively larger impact. The effect of confining pressure and loading amplitude were increased, Nanjing saturated fine sand under the condition of large deformation after initial liquefaction stress-strain curve of reverse unloading stage shear modulus are obviously increased, and the decay rate of shear modulus with subsequent cyclic loading time becomes much faster. But with the increase of initial shear stress attenuation. The speed of the stage of shear modulus with subsequent cyclic loading time has slowed down the trend. At the same time, based on the test results, given Nanjing saturated fine sand under the condition of large deformation after initial liquefaction stress-strain curves at different stages of shear modulus and one-way flow method to determine the attenuation function and its fitting parameters related to the cumulative deformation.

【作者單位】： 南京工業(yè)大學(xué)巖土工程研究所;
【分類號(hào)】：TU43
【正文快照】： 砂土液化引起的場(chǎng)地側(cè)向流動(dòng)變形將會(huì)導(dǎo)致地面滑移達(dá)到數(shù)米的量級(jí)。例如,1964年的新瀉地震和1983年的日本海中部地震的震害調(diào)查中,傾斜砂土場(chǎng)地的地面位移達(dá)到了12.71 m[1];1971年美國(guó)圣費(fèi)爾南多地震中地面?zhèn)认蛭灰七_(dá)到了3 m多;1995年日本阪神大地震中,在大阪、神戶沿�；靥钔�

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