静动应力作用下大连饱和黏土的剪切特性研究
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摘要
针对人工制备的大连饱和黏土,在静应力与循环应力联合作用下进行了多组循环剪切试验,着重探讨了初始静力大小及加载速率对循环剪切变形特性的影响.试验表明静应力与循环应力作用下饱和黏土具有循环蠕变特性,总应变由初始静应变和循环蠕变两部分组成,其中循环蠕变主要受循环应力幅值、初始静应力大小及其加载速率的影响,循环蠕变的逐次增加量受循环应力幅值的变化影响最大。在对试验结果分析基础上,考虑初始静应力大小及其加载速率的影响,采用等效应力方法建议了循环蠕变经验关系式,并引入屈服面流变理论,建立了单调与循环荷载联合作用下的循环蠕变计算模型,3个模型参数易于通过循环剪切试验获得。
Many cyclic shear tests are performed on the saturated clay specimens prepared in Dalian under the action of static and cyclic stresses.The effect of the initial static stress magnitude and its loading rate on cyclic stress-strain relations is emphatically discussed,and then the constituents and its equation of general strain are analyzed.The testing data indicate that the general strain is constituted by two parts,the initial static strain and cyclic creep.The variation of cyclic creep is mainly affected by the cyclic stress amplitude and the magnitude and loading rate of initial static stress.But the cyclic stress amplitude is the most influential factor of the variation of cyclic creep.Based on the testing results,an experimental relation of cyclic creep is suggested by employing equivalent stress method,considering the magnitude and loading rate of initial static stress.Furthermore,the computational model of cyclic creep under the action of monotonic and cyclic load is established by introducing the rheological theory of yield surface.The model parameters are easy to obtain by performing cyclic shearing tests.
Many cyclic shear tests are performed on the saturated clay specimens prepared in Dalian under the action of static and cyclic stresses.The effect of the initial static stress magnitude and its loading rate on cyclic stress-strain relations is emphatically discussed,and then the constituents and its equation of general strain are analyzed.The testing data indicate that the general strain is constituted by two parts,the initial static strain and cyclic creep.The variation of cyclic creep is mainly affected by the cyclic stress amplitude and the magnitude and loading rate of initial static stress.But the cyclic stress amplitude is the most influential factor of the variation of cyclic creep.Based on the testing results,an experimental relation of cyclic creep is suggested by employing equivalent stress method,considering the magnitude and loading rate of initial static stress.Furthermore,the computational model of cyclic creep under the action of monotonic and cyclic load is established by introducing the rheological theory of yield surface.The model parameters are easy to obtain by performing cyclic shearing tests.
引文
[1]黄绍铭,高大钊.软土地基与地下工程[M].北京:中国建筑工业出版社,2005.
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[3]Andersen K H,Lauritzsen R.Bearing capacity for foundations with cyclic loads[J].Journal of Geotechnical Engineering,ASCE,1988,114(5):540-555.
[4]Y1lmaz MT,Pekcan O,Bak1r B S.Undrained cyclic shear and deformation behavior of silt-clay mixtures of Adapazar1,Turkey[J].Soil Dy-namics and Earthquake Engineering,2004,24:497-507.
[5]齐剑峰,栾茂田,聂影,等.循环应力下饱和黏土剪切变形特性与破坏标准的试验研究[C]∥第七届全国土动力学会议论文集,北京:清华大学出版社,2006.
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[10]张永兴,丁玉琴,陈建工.基于双曲正切函数的土动力非线性本构模型[J].地震工程与工程振动,2010,30(4):166-171.
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[13]齐剑峰,聂影,赵维,等.室内黏土试样制备技术的改进及应用[C]∥土工测试技术实践与发展(第24届全国土工测试学术研讨会论文集),郑州:黄河水利出版社,2005:123-126.
[14]齐剑峰,栾茂田,聂影,许成顺.饱和黏土循环剪切强度与变形特性的试验研究[J].水利学报,2008,39(7):822-828.
[15]南京水利科学研究院土工研究所编著.土工试验技术手册[M].北京:人民交通出版社,2003,94-95.
[16]朱登峰,黄宏伟,殷建华.饱和软粘土的循环蠕变特性[J].岩土工程学报,2005,27(9):1060-1064.
[17]齐剑峰,栾茂田,王忠涛,等.饱和黏土不排水剪切特性及双曲线模型[J].岩土力学,2008,29(8):2277-2283.
[18]Lin HD,Wang C C.Stress-strain-time function of clay[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,1998,124(4):289-296.
[19]袁静,龚晓南,益德清.岩土流变模型的比较研究[J].岩石力学与工程学报,2001,20(6):772-779.
[20]张学言,闫澍旺.岩土塑性力学基础[M].天津:天津大学出版社,2004:119-120.
[2]Andersen KH,Kleven A,Heien D.Cyclic soil data for design of gravity structure[J].Journal of Geotechnical Engineering,ASCE,1988,114(5):517-539.
[3]Andersen K H,Lauritzsen R.Bearing capacity for foundations with cyclic loads[J].Journal of Geotechnical Engineering,ASCE,1988,114(5):540-555.
[4]Y1lmaz MT,Pekcan O,Bak1r B S.Undrained cyclic shear and deformation behavior of silt-clay mixtures of Adapazar1,Turkey[J].Soil Dy-namics and Earthquake Engineering,2004,24:497-507.
[5]齐剑峰,栾茂田,聂影,等.循环应力下饱和黏土剪切变形特性与破坏标准的试验研究[C]∥第七届全国土动力学会议论文集,北京:清华大学出版社,2006.
[6]沈珠江.理论土力学[M].北京:中国水利水电出版社,2000.
[7]孟凡超,袁晓铭,孙锐,等,土体永久变形中地震动有效荷载研究[J].地震工程与工程振动,2009,29(5):170-178.
[8]Pestana J M,Biscontin G,Nadim F,et al.Modeling cyclic behavior of lightly overconsolidated clays in simple shear[J].Soil Dynamics andEarthquake Engineering,2000,19:501-519.
[9]Tao Li,Meissner H.Two-surface plasticity model for cyclic undrained behavior of clays[J].Journal of Geotechnical and Geoenvironmental Engi-neering,ASCE,2002,128(7):613-626.
[10]张永兴,丁玉琴,陈建工.基于双曲正切函数的土动力非线性本构模型[J].地震工程与工程振动,2010,30(4):166-171.
[11]刘振纹.软土地基上桶形基础稳定性研究[博士学位论文][D].天津.天津大学,2001.
[12]栾茂田,郭莹,李木国,等.土工静力-动力液压三轴-扭转多功能剪切仪研发及应用[J].大连理工大学学报,2003,43(5):670-675.
[13]齐剑峰,聂影,赵维,等.室内黏土试样制备技术的改进及应用[C]∥土工测试技术实践与发展(第24届全国土工测试学术研讨会论文集),郑州:黄河水利出版社,2005:123-126.
[14]齐剑峰,栾茂田,聂影,许成顺.饱和黏土循环剪切强度与变形特性的试验研究[J].水利学报,2008,39(7):822-828.
[15]南京水利科学研究院土工研究所编著.土工试验技术手册[M].北京:人民交通出版社,2003,94-95.
[16]朱登峰,黄宏伟,殷建华.饱和软粘土的循环蠕变特性[J].岩土工程学报,2005,27(9):1060-1064.
[17]齐剑峰,栾茂田,王忠涛,等.饱和黏土不排水剪切特性及双曲线模型[J].岩土力学,2008,29(8):2277-2283.
[18]Lin HD,Wang C C.Stress-strain-time function of clay[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,1998,124(4):289-296.
[19]袁静,龚晓南,益德清.岩土流变模型的比较研究[J].岩石力学与工程学报,2001,20(6):772-779.
[20]张学言,闫澍旺.岩土塑性力学基础[M].天津:天津大学出版社,2004:119-120.
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