桩-液化土相互作用p-y曲线修正计算方法研究
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摘要
利用大型振动台桩–土–承台试验,以API规范为基础,提出可液化土层中桩基动力p–y曲线双参数修正方法及修正计算公式,解决目前API规范折减系数法计算可液化土层中桩基动力p–y曲线不符合实际、工程设计上难以接受的问题。采用4种不同密度可液化砂土层等幅波振动台试验,以砂土密度作为主要控制因素,对API规范计算公式中土体初始模量和极限土阻力这两个参数进行修正,提出修正系数。采用地震波输入大型振动台桩–液化土–承台相互作用试验进行验证,结果表明所提修正公式与试验结果较为符合。修正公式保留了API规范的基本模式,修正系数表达简单明了,物理含义明确,具备工程应用前景。
Based on the API code, the double-parameter modified method and the revised computational formula for lateral dynamic p–y curves of pile foundation in liquefiable soil layers are presented by using pile-soil shaking table tests, and as a result, the unacceptable problem of the current coefficients for calculating the dynamic p-y curves by the API code in engineering practice can be solved. Using four different densities of liquefiable sand layers in the shaking table tests by incident sinusoidal waves and taking the sand density as a major factor, the initial modulus and ultimate soil resistance parameters in the API code are modified. Using shaking table tests on pile-soil liquefaction interaction by incident irregular seismic waves the modified method and the revised computational formula are verified. It is indicated that the modified method and the revised formula are agreeable with the test results. The expression of the revised formula is as simple as that in the API code and is convenient for practical engineering application.
Based on the API code, the double-parameter modified method and the revised computational formula for lateral dynamic p–y curves of pile foundation in liquefiable soil layers are presented by using pile-soil shaking table tests, and as a result, the unacceptable problem of the current coefficients for calculating the dynamic p-y curves by the API code in engineering practice can be solved. Using four different densities of liquefiable sand layers in the shaking table tests by incident sinusoidal waves and taking the sand density as a major factor, the initial modulus and ultimate soil resistance parameters in the API code are modified. Using shaking table tests on pile-soil liquefaction interaction by incident irregular seismic waves the modified method and the revised computational formula are verified. It is indicated that the modified method and the revised formula are agreeable with the test results. The expression of the revised formula is as simple as that in the API code and is convenient for practical engineering application.
引文
[1]中国科学院工程力学研究所.海城地震震害[M].北京:地震出版社,1979.(Institute Engineering Mechanics.Haicheng earthquake damage[M].Beijing:Seismological Press,1979.(in Chinese))
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[4]李雨润,袁晓铭.液化场地上土体侧向变形对桩基影响研究述评[J].世界地震工程,2004,20(2):17-22.(LI Yu-run,YUAN Xiao-ming.State-of-art of study on effects of liquefaction-induced soil spreading on pile foundation response[J].World Earthquake Engineering,2004,20(2):17-22.(in Chinese))
[5]WILSON Daniel W,et al.Observed seismic lateral resistance of liquefying sand[J].Journal of Geotechnical and Geoenvironmental Engineering,2000:898-906.
[6]American Petroleum Inst.Recommended practice for planning,designing,and constructing fixed offshore platforms[M].Working Stress Design,Rpt.RP2A-WSD.Washington:American Petroleum Inst,1976.
[2]丁剑霆,姜淑珍,包峰.唐山地震桥梁震害回顾[J].世界地震工程,2006,22(1):17-22.(DING Jian-ting,JIANG Shu-zhen,BAO Feng.Recalling of Tangshan Earthquake bridge damages[J].World Earthquake Engineering,2006,22(1):17-22.(in Chinese))
[3]中国赴日地震考察团.日本阪神大地震考察[M].北京:地震出版社,1995.(Chinese Inspection Delegation for Kobe Earthquake.Kobe earthquake damage inspection of Japan[M].Beijing:Seismological Press,1995.(in Chinese))
[4]李雨润,袁晓铭.液化场地上土体侧向变形对桩基影响研究述评[J].世界地震工程,2004,20(2):17-22.(LI Yu-run,YUAN Xiao-ming.State-of-art of study on effects of liquefaction-induced soil spreading on pile foundation response[J].World Earthquake Engineering,2004,20(2):17-22.(in Chinese))
[5]WILSON Daniel W,et al.Observed seismic lateral resistance of liquefying sand[J].Journal of Geotechnical and Geoenvironmental Engineering,2000:898-906.
[6]American Petroleum Inst.Recommended practice for planning,designing,and constructing fixed offshore platforms[M].Working Stress Design,Rpt.RP2A-WSD.Washington:American Petroleum Inst,1976.
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