离心机振动台试验中侧向流动地基位移分析方法研究
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摘要
通过分析倾斜可液化地基的离心机振动台试验,对离心机振动台试验中地基土体位移分析方法进行了研究,得到了能够有效测量和计算可液化地基地震过程中和震后侧向流动的位移的方法。这种分析方法能够通过对加速度数据的处理和计算,有效地克服位移传感器在地震过程中反应不够灵敏导致的位移过程测量的误差,得到合理的地震过程中地基位移变化;同时利用位移传感器对低频位移测量准确的优势,通过量测的震后侧向位移值对计算位移值进行修正,可以得到地震结束后,地基的最终变形。本研究为土工离心机振动台试验中侧向流动地基的位移测量和分析提供可靠有效的方法,也能够为进一步的可液化地基离心模型试验的土体位移相关研究分析提供必要基础。
Through analyzing a dynamic centrifuge model test for single pile foundation in sloping liquefiable ground,effective calculation and measurement of soil displacement are explored under an earthquake and during lateral spreading after strong earthquakes.The developed method can overcome the inaccuracy of displacement sensors in centrifuge model tests under strong earthquakes.Through processing and integration of measured acceleration data,soil displacement processing under earthquakes can be calculated.Using the advantages of displacement sensors for measuring low frequency displacements,the measured post-earthquake lateral spreading is added to the calculated displacement to acquire the final displacement in the soil.This research provides an effective method for the displacement analysis of soil in dynamic centrifuge tests,and will provide basis for further investigation into the displacement of lateral spreading ground under earthquakes.
Through analyzing a dynamic centrifuge model test for single pile foundation in sloping liquefiable ground,effective calculation and measurement of soil displacement are explored under an earthquake and during lateral spreading after strong earthquakes.The developed method can overcome the inaccuracy of displacement sensors in centrifuge model tests under strong earthquakes.Through processing and integration of measured acceleration data,soil displacement processing under earthquakes can be calculated.Using the advantages of displacement sensors for measuring low frequency displacements,the measured post-earthquake lateral spreading is added to the calculated displacement to acquire the final displacement in the soil.This research provides an effective method for the displacement analysis of soil in dynamic centrifuge tests,and will provide basis for further investigation into the displacement of lateral spreading ground under earthquakes.
引文
[1]Ashford S A,Juirnarongrit T.Performance of lifelines subjected to lateral spreading[R].Pacific Earthquake Engineering Research Center,2006.
[2]Ohtani K,Ogawa N,Katayama T,et al.Project“E-Defense”-introduction of e-defense[C].PCEE,2003.
[3]李培振,任红梅,吕西林,等.液化地基自由场振动台模型试验研究[J].地震工程与工程振动,2008,28(2):171-178.
[4]张建民,于玉贞,濮家骝,等.电液伺服控制离心机振动台系统研制[J].岩土工程学报,2004,26(6):843-845.
[5]于玉贞,邓丽军.土工动力离心模型试验在边坡工程中的应用综述[J].世界地震工程,2007,23(4):212-215.
[6]孙锐,袁晓铭,王永志,等.NEES系统中振动离心机最新进展及国内振动离心机发展设想[J].世界地震工程,2010,26(1):31-39.
[7]刘晶波,刘祥庆,王宗纲,等.砂土地基自由场离心机振动台模型试验[J].清华大学学报(自然科学版),2009,49(9):1463-1466.
[8]Zeng X,Wu J,Young B A.Influence of viscous fluids on properties of sand[J].Geotechnical Testing Journal,1998,21(1):45-51.
[9]张建民.水平地基液化后大变形对桩基础的影响[J].建筑结构学报,2001,22(5):75-78.
[10]Wilson D W,Boulanger R W,Kutter B L,et al.Dynamic centrifuge tests of pile-supported structures in liquefiable sand[C].National SeismicConference on Bridges and Highways,1995.
[11]John G P,Dimitris G M.数字信号处理[M].方艳梅,刘永清译.电子工业出版社,2007.
[2]Ohtani K,Ogawa N,Katayama T,et al.Project“E-Defense”-introduction of e-defense[C].PCEE,2003.
[3]李培振,任红梅,吕西林,等.液化地基自由场振动台模型试验研究[J].地震工程与工程振动,2008,28(2):171-178.
[4]张建民,于玉贞,濮家骝,等.电液伺服控制离心机振动台系统研制[J].岩土工程学报,2004,26(6):843-845.
[5]于玉贞,邓丽军.土工动力离心模型试验在边坡工程中的应用综述[J].世界地震工程,2007,23(4):212-215.
[6]孙锐,袁晓铭,王永志,等.NEES系统中振动离心机最新进展及国内振动离心机发展设想[J].世界地震工程,2010,26(1):31-39.
[7]刘晶波,刘祥庆,王宗纲,等.砂土地基自由场离心机振动台模型试验[J].清华大学学报(自然科学版),2009,49(9):1463-1466.
[8]Zeng X,Wu J,Young B A.Influence of viscous fluids on properties of sand[J].Geotechnical Testing Journal,1998,21(1):45-51.
[9]张建民.水平地基液化后大变形对桩基础的影响[J].建筑结构学报,2001,22(5):75-78.
[10]Wilson D W,Boulanger R W,Kutter B L,et al.Dynamic centrifuge tests of pile-supported structures in liquefiable sand[C].National SeismicConference on Bridges and Highways,1995.
[11]John G P,Dimitris G M.数字信号处理[M].方艳梅,刘永清译.电子工业出版社,2007.
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