饱和砂土透镜体液化对建筑物地震反应的影响
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摘要
采用一种能分析有结构物存在的场地地震液化问题的二维有效应力有限元分析方法，研究饱和砂上透镜体液化对建筑物地震反应的影响。计算中采用了更为合理的迭代方式处理上的非线性，考虑了Kc对孔压的作用，引入了透射边界。取建筑物为短周期结构，考虑了透镜体宽度、厚度、埋深以及输入地震动类型、幅值对结构加速度反应的影响。计算结果表明：（1）所采用的方法与已有的模型实验结果有很好的对应关系，可用于分析建筑物存在下的场地砂上液化问题；（2）饱和砂上透镜体液化对短周期建筑物主要起到隔震作用，且随着透镜体厚度、理深和宽度的增加以及场地输入地震动加速度的增大，减震效果有所增加；（3）在冲击型地震动作用下，埋深浅、宽度和厚度小的液化透镜体有时却对短周期结构加速度反应起到增大作用。
Using 2-D effective stress method the effect of liquefaction of the lenticular sand zone on the earthquake response of building is investigated. The effect of the input form of the seismic ground motion and the thickness, width and depth of the sand lentic1e on the building response is discussed. The results indicate: (1)The results by the method presented in the paper is agreeable with those by the model test. It means that 'the method can be used to analyze the problem of sand liquefaction in the case of existing building.(2)The liquefied lenticle mainly has the effect of isolation on the building with short period and the effect of the vibration isolation increases with the increasing of the thickness, depth and width of the sand lenticle. (3)When subjected to the seismic ground motion of the shock type, the shallow, thin and narrow liquefied lenticle may amplify the response of the building with short:period.
Using 2-D effective stress method the effect of liquefaction of the lenticular sand zone on the earthquake response of building is investigated. The effect of the input form of the seismic ground motion and the thickness, width and depth of the sand lentic1e on the building response is discussed. The results indicate: (1)The results by the method presented in the paper is agreeable with those by the model test. It means that 'the method can be used to analyze the problem of sand liquefaction in the case of existing building.(2)The liquefied lenticle mainly has the effect of isolation on the building with short period and the effect of the vibration isolation increases with the increasing of the thickness, depth and width of the sand lenticle. (3)When subjected to the seismic ground motion of the shock type, the shallow, thin and narrow liquefied lenticle may amplify the response of the building with short:period.
引文
[1] 石兆吉,张延军,孙锐. 土层液化对房屋遭受的地震荷载的影响[J].世界地震工程,11(3),1995.
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[7] Pyke R.M,Nonlinear Soil hr Irregular Cyclic Loadings[J].Journal of the Geotechnical Engineering Division.ASCE,105(6),1979.
[8] 丰万玲,石兆吉. 判别水平层液化势的孔隙水压力分析方法[J].工程地震,1988.
[9]Wang Tiansong and Liu Ying, Stability of Staturated Sands under Earthquake Loading[J], Computers and Geotechnics,2(5),1986.
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[11]廖振鹏. 工程波动理论导引[M].科学出版社, 1996
[12] 孙锐.袁晓铭,石兆吉.建筑物地基中地震孔压的计算分析[J].世界地震工程,15(3),1999.
[2]方鸿琪等. 唐山强震区地震工程地质研究[R],建筑科学研究报告, 中国建筑科学研究院勘察技术研究所.1981.
[3] 刘惠珊.乔太平. 有基础作用时饱和砂层的液化特性. 地基与工业建筑抗震.1984
[4]陈克景,刘惠珊.基础下地基的液化、变形与破坏特性[C]. 全国土工建筑物和地基抗震学术会议论文集汇编.1986.
[5]陈文化,门福录.景立平,王德润. 有建筑物存在下的饱和砂土地基液化振动合模拟研究[J]. 地震工程与工程振动, 18(4),1998.
[6] 孙锐.袁晓铭,石兆吉. 地震液化的有效应力二维有限元分析方法[J],世界地震工程,14(1),1998.
[7] Pyke R.M,Nonlinear Soil hr Irregular Cyclic Loadings[J].Journal of the Geotechnical Engineering Division.ASCE,105(6),1979.
[8] 丰万玲,石兆吉. 判别水平层液化势的孔隙水压力分析方法[J].工程地震,1988.
[9]Wang Tiansong and Liu Ying, Stability of Staturated Sands under Earthquake Loading[J], Computers and Geotechnics,2(5),1986.
[10] 石兆吉,王承春. 预测轻亚粘土液化势的剪切波速法[C].全国地震工程会议论文集,1984.
[11]廖振鹏. 工程波动理论导引[M].科学出版社, 1996
[12] 孙锐.袁晓铭,石兆吉.建筑物地基中地震孔压的计算分析[J].世界地震工程,15(3),1999.
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