多遇地震下古建筑地基土体振陷特性实验
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摘要
古建筑因为历史建造和使用期长,加上使用期间的地震作用,多有倾斜,其地基所受应力处于不均匀应力分布状态.通过动三轴试验,针对两类软硬不同古建筑群地基土体,选定不同固结比及动应力幅值模拟地基土在不均匀应力作用下承受多遇地震作用,采集其变形累计并讨论土体各指标与应力水平间的变化规律,发现软土的振陷主要发生在振动后的再固结过程中,而硬土在类似小幅、多次振动下抗震性能较好,且上部负重越大振动对其影响就越小.分析将为现有倾斜状态下的古建筑的结构稳定评估提供参考依据.
Owing to a long period of time in construction and using,coupled with the influence of earthquakes,most of the ancient buildings have a tilt and soils are in a state of non-uniform stress distribution.By selecting different consolidation ratios and dynamic stress amplitudes,the dynamic triaxial test analogs two kinds of foundation soils,soft and hard,under uneven stress in small and frequent earthquakes to discuss the regulations between the parameters of soil and changes in stress level,and also provide references on stability assessment of ancient buildings in existing tilt.The results show the dynamic settlement of soft soil mainly occurs in the reconsolidation process after the vibration,while the hard one performs well under this circumstance and tends to be safer when its upper weights become larger.
Owing to a long period of time in construction and using,coupled with the influence of earthquakes,most of the ancient buildings have a tilt and soils are in a state of non-uniform stress distribution.By selecting different consolidation ratios and dynamic stress amplitudes,the dynamic triaxial test analogs two kinds of foundation soils,soft and hard,under uneven stress in small and frequent earthquakes to discuss the regulations between the parameters of soil and changes in stress level,and also provide references on stability assessment of ancient buildings in existing tilt.The results show the dynamic settlement of soft soil mainly occurs in the reconsolidation process after the vibration,while the hard one performs well under this circumstance and tends to be safer when its upper weights become larger.
引文
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[3]Seed H B,Martin G R,Lysmer J.Pore-water pressurechanges during soil liquefaction[J].Journey of theGeotechnical Engineering Division,ASCE,1976,102(GT4):327.
[4]石兆吉,郁寿松.土壤震陷试验研究[J].岩土工程学报,1989,4(11):35.SHI Zhaoji,YU Shousong.Experimental investigation of soilsettlement due to earthquake[J].Chinese Journal ofGeotechnical Engineering,1989,4(11):35.
[5]孟上九,曹文海,袁晓明.地震荷载下土体残余应变及孔压研究综述[J].世界地震工程,2001,17(3):49.MENG Shangjiu,CAO Wenhai,YUAN Xiaoming.A summary ofresearch on residual strain and pore pressure of soils underearthquake loads[J].World Information on EarthquakeEngineering,2001,17(3):49.
[6]于洪治,何广讷,杨斌.软土震陷特性的实验研究[J].大连理工大学学报,1996,36(1):76.YU Hongzhi,HE Guangna,YANG Bin.Experimentalinvestigation of soil seismic deformation property[J].Journalof Dalian University of Technology,1996,36(1):76.
[7]中华人民共和国水利部.SL237—1999土工试验规范[S].北京:中国水利水电出版社,1999.Ministry of Water Resources of the People’s Republic of China.SL237—1999 Geotechnical test specification[S].Beijing:ChinaWaterpower Press,1999.
[8]Nagase H,Ishihara K.Effects of load irregularity on the cyclicbehavior of sand dynamics and earthquake engineering[J].Soil Dynamics and Earthquake Engineering.1987,6(4):239.
[9]曹继东,陈正汉,王权民.厦门软粘土的振陷特性研究[J].岩土力学,2004,25(1):160.CAO Jidong,CHEN Zhenhan,WANG Quanmin.Study oncharacteristics of seismic depression of soft clay in Xiamen[J].Rock and Soil Mechanics,2004,25(1):160.
[10]朱定华,施建军,陈国兴.南京新近沉积淤泥质土震陷特性试验研究[J].防灾减灾工程学报,2008,28(1):26.ZHU Dinghua,SHI Jianjun,CHEN Guoxing.Experimentalstudy on characteristics of seismic settlement of recentlydeposited muddy soil in Nanjing City[J].Journal of DisasterPrevention and Mitigation Engineering,2008,28(1):26.
[11]骆亚生,谢定义,董为民,等.不同地区黄土振陷变形特性的对比分析[J].陕西水力发电,2001,17(1):4.LUO Yasheng,XIE Dingyi,DONG Weimin,et al.Comparativeanalysis of the vibration deformation behavior of the loess fromthe different regions[J].Journal of Shaanxi Water Power,2001,17(1):4.
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