福州市橘园洲防洪堤有限元液化分析研究
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摘要
针对福州市橘园洲防洪堤的K4+000断面和K6+260断面的饱和砂基进行液化稳定分析,采用动剪应力对比法进行液化判别.地震剪应力采用考虑动孔压的上升对动剪切模量的修正作用的三维二相非线性有限元法计算,抗液化剪应力采用动力试验确定相应的参数引入经验公式进行修正计算,得到了各断面下的液化分布图.
By applying shearing stress antithesis on liquefied analysis,the K4+000 monitor cross section and K6+260 monitor cross section of Juyuanzhou protection levee in Fuzhou Aera are studied for liquefied stabilization analysis.Dynamic shear stress contrast methord is used for distinguishing liquefaction,during which three-dimensional and two-phase nonlinear FEM based on the shearing modulus influenced by mechanical pore water pressure is applied to its seismic shear stress.Meanwhile,empirical formula is introduced to determine its anti-liquefaction shear stress,with parameters defined by dynamical experiment.Thus the liquid distribution of various sections is worked out,which provides a theoretical basis for the liquefication analysis of the flood protection levee.
By applying shearing stress antithesis on liquefied analysis,the K4+000 monitor cross section and K6+260 monitor cross section of Juyuanzhou protection levee in Fuzhou Aera are studied for liquefied stabilization analysis.Dynamic shear stress contrast methord is used for distinguishing liquefaction,during which three-dimensional and two-phase nonlinear FEM based on the shearing modulus influenced by mechanical pore water pressure is applied to its seismic shear stress.Meanwhile,empirical formula is introduced to determine its anti-liquefaction shear stress,with parameters defined by dynamical experiment.Thus the liquid distribution of various sections is worked out,which provides a theoretical basis for the liquefication analysis of the flood protection levee.
引文
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[3]钱家欢,殷宗泽.土工原理与计算[M].北京:中国水利水电出版社,1996:576-578.
[4]张克绪.饱和砂土的液化应力条件[J].地震工程及工程振动,1984,4(1):99-108.
[5]戴永志,顾淦臣.黄河公伯峡混凝土面板堆石坝三维非线性分析[J].红水河,2001,11(4):3-4.
[6]郭莹,栾茂田,董秀竹,等.不同应力条件下砂土动模量特性的试验对比研究[J].水利学报,2003(5):41-45.
[7]沈珠江.理论土力学[M].北京:中国水利水电出版社,2005:262-268.
[8]SL203-97水工建筑物抗震设计规范[S].
[9]王奎峰.石佛寺水库土石坝地震液化分析及防治[D].阜新:辽宁工程技术大学,2005.
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