基于FLAC3D液化土中樁基側(cè)向動力特性數(shù)值模擬研究*
李雨潤1,2，王小燕1，羅祥1
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（1 河北工業(yè)大學(xué)土木工程學(xué)院， 天津 300401； 2 河北省土木工程技術(shù)研究中心， 天津 300401）
［摘要］強震作用下的樁基動力響應(yīng)一直是土動力學(xué)和巖土工程抗震領(lǐng)域研究的熱點?；谝夯林械臉痘駝优_試驗，采用有限差分軟件FLAC3D進行數(shù)值模擬，并將模擬結(jié)果與試驗結(jié)果進行對比分析。結(jié)果表明，在正弦波工況下隨著輸入波峰值加速度的增加，樁基橫向動力響應(yīng)明顯，尤其是當(dāng)輸入峰值加速度為0.15g時砂土發(fā)生液化，樁基橫向動力響應(yīng)達到最大，模擬結(jié)果與試驗結(jié)果非常接近；在El Centro地震波輸入下，加速度時程曲線形狀和數(shù)值大小在不同的時刻略有差異，而位移時程曲線形狀和數(shù)值大小吻合較好；同時，兩種工況下的孔壓比時程曲線也吻合較好，試驗孔壓比略有下降而模擬孔壓比下降不明顯，模擬孔壓比在前期比試驗孔壓比小一些。［關(guān)鍵詞］振動臺試驗; 液化土; 動力特性; FLAC3D; 數(shù)值模擬中圖分類號：TU473 文獻標(biāo)識碼：A 文章編號：1002-848X(2015)21-0070-04
Numerical simulation study on lateral dynamic characteristics of pile foundation in liquefied soil based on FLAC3DLi Yurun1,2, Wang Xiaoyan1, Luo Xiang1(1 College of Civil Engineering, Hebei University of Technology, Tianjin 300401, China; 2 Civil Engineering Technology Research Center of Hebei Province, Tianjin 300401, China)Abstract: The dynamic response of pile foundation under the strong earthquake action has been a hot research issue in seismic fields of soil dynamics and geotechnical engineering. Based on the shaking table test of pile foundation in liquefied soil, the finite difference software FLAC3D was used to carry out numerical simulation and the simulation results were compared with the experimental results. The results show that the lateral dynamic response of pile foundation is obvious with the increase of the wave peak acceleration under different working conditions input by sine wave. The sandy soil is liquefied and the lateral dynamic response reaches the maximum especially when the peak acceleration is 0.15g.Under El Centro earthquake wave input, the shape and the numerical value of the acceleration time history curve are slightly different in different time, and the shape of the displacement time history curve is in good agreement with the numerical value. The lower pore pressure ratio in experiment decreases slightly and the decline of the pore pressure ratio in simulation is not obvious. The pore pressure ratio in simulation is smaller than thatin experiment in the early time.Keywords: shaking table test; liquefied soil; dynamic characteristic; FLAC3D; numerical simulation
*國家自然科學(xué)基金資助項目（51008110），河北省自然科學(xué)基金資助（E2013202118），中國博士后科學(xué)基金資助項目（2014M561169），河北省住房和城鄉(xiāng)建設(shè)廳（2014-231）。作者簡介：李雨潤，博士，副教授，Email：iemlyr7888@163.com。
