原状Q_3黄土湿陷特性的CT-三轴试验
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摘要
利用应力控制式CT-三轴仪及CT-湿陷性三轴仪,在控制吸力的条件下,试验研究原状Q3黄土的浸水湿陷特性。做了2组共15个三轴试验,包括均压浸水试验和以双线法进行的侧向卸荷浸水试验,试验中利用CT机进行无损断面扫描,并用得到的CT数定量分析原状Q3黄土的结构性对湿陷的影响。结果表明:对于双线法湿陷试验,同一吸力和偏应力下,固结净围压大的试样湿陷变形大于固结净围压较小的试样湿陷变形,包括体应变、轴应变及偏应变量;均压浸水湿陷试验时,在试样饱和前,随着浸水量的增加CT数与浸水量之间基本呈线性关系;当试样趋于饱和时,CT数增大减缓;均压浸水湿陷试验中,在同一吸力下,固结净围压大的湿陷体应变较大,结构演化变量值也越大。
The collapsability test for undisturbed Q3 loess under suction control is studied with stress controlled triaxial apparatus.15 CT-triaxial tests are performed,including double-triaxial unloading confining pressure tests and isotropic compression tests.During the tests,computerized tomography(CT) is employed.Using the CT data,the effect of the Q3 loess′s structure is analyzed.The results show that,for the double triaxial collapsible tests,collapsible deformation increases with net confining pressure increasing,including the volumetric strain,axial strain and deviator strain.For the isotropic compression collapse tests,the relationship between water content and the CT data is linear before the specimen is saturated.The CT data increasing velocity will slow down with high enough saturation.For the isotropic compression collapse tests,if the specimen has the same suction,the high net confining pressure versus big volumetric strain,and the value of the structural evolution have the same rule,too.
The collapsability test for undisturbed Q3 loess under suction control is studied with stress controlled triaxial apparatus.15 CT-triaxial tests are performed,including double-triaxial unloading confining pressure tests and isotropic compression tests.During the tests,computerized tomography(CT) is employed.Using the CT data,the effect of the Q3 loess′s structure is analyzed.The results show that,for the double triaxial collapsible tests,collapsible deformation increases with net confining pressure increasing,including the volumetric strain,axial strain and deviator strain.For the isotropic compression collapse tests,the relationship between water content and the CT data is linear before the specimen is saturated.The CT data increasing velocity will slow down with high enough saturation.For the isotropic compression collapse tests,if the specimen has the same suction,the high net confining pressure versus big volumetric strain,and the value of the structural evolution have the same rule,too.
引文
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[12]陈正汉,孙树国,方祥位,等.多功能土工三轴仪的研制及其应用[J].后勤工程学院学报,2007,23(4):1-5.(CHEN Zhenghan,SUN Shuguo,FANG Xiangwei,et al.Development and application of multi-function triaxial apparatus for soil[J].Journal of Logistical Engineering University,2007,23(4):1-5.(in Chinese))
[13]朱元青,陈正汉.研究黄土湿陷性的新方法[J].岩土工程学报,2008,30(4):524-528.(ZHU Yuanqing,CHEN Zhenghan.A new method of studying collapsibility of loess[J].Chinese Journal of Geotechnical Engineering,2008,30(4):524-528.(in Chinese))
[14]李加贵,陈正汉,黄雪峰,等.非饱和Q3黄土在侧向卸荷过程中的细观结构演化及强度特性研究[J].岩土力学,2010,31(4):1084-1091.(LI Jiagui,CHEN Zhenghan,HUANG Xuefeng,et al.CT-triaxial shear tests on the meso-structure evolution and strength of unsaturated Q3loess during unloading confining pressure[J].Rock and Soil Mechanics,2010,31(4):1084-1091.(in Chinese))
[15]朱元青.基于细观结构变化的非饱和原状湿陷性黄土的本构模型研究[博士学位论文][D].重庆:解放军后勤工程学院,2008.(ZHU Yuanqing.Study of unsaturated and collapsibility model of loess at original state considering meso-structure evolution[Ph.D.Thesis][D].Chongqing:Logistical Engineering University of PLA,2008.(in Chinese))
[16]方祥位.非饱和原状Q2黄土的湿陷机制及结构性本构模型研究[博士学位论文][D].重庆:解放军后勤工程学院,2008.(FANG Xiangwei.Study of collapse mechanism and structural model of unsaturated Q2loess at original state[Ph.D.Thesis][D].Chongqing:Logistical Engineering University of PLA,2008.(in Chinese))
[2]陈正汉,刘祖典.黄土的湿陷变形机制[J].岩土工程学报,1986,8(3):1-12.(CHEN Zhenghan,LIU Zudian.Mechanism of collapsible deformation of loess[J].Chinese Journal of Geotechnical Engineering,1986,8(3):1-12.(in Chinese))
[3]高国瑞.黄土湿陷变形的结构理论[J].岩土工程学报,1990,12(4):1-10.(GAO Guorui,A structure theory for collapsing deformation of loess soils[J].Chinese Journal of Geotechnical Engineering,1990,12(4):1-10.(in Chinese))
[4]黄雪峰,陈正汉,方祥位,等.大厚度自重湿陷性黄土地基处理厚度与处理方法研究[J].岩石力学与工程学报,2007,26(增2):4332-4338.(HUANG Xuefeng,CHEN Zhenghan,FANG Xiangwei,et al.Study of foundation treatment thickness and treatment method for collapse loess with large thickness[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(Supp.2):4332-4338.(in Chinese))
[5]朱彦鹏,王贵文,王秀丽,等.诱使沉降法纠正偏移建筑的模型试验及案例分析[J].岩石力学与工程学报,2007,26(增1):3288-3296.(ZHU Yanpeng,WANG Guiwen,WANG Xiuli,et al.Model test on rectification of inclined buildings by induced settlement method and case studies[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(Supp.1):3288-3296.(in Chinese))
[6]谢定义,齐吉琳,朱元林.土的结构性参数及其与变形强度的关系[J],水利学报,1999,30(10):1-6.(XIE Dingyi,QI Jilin,ZHU Yuanlin.Soil structure parameter and its relations to deformation and strength[J].Journal of Hydraulic Engineering,1999,30(10):1-6.(in Chinese))
[7]齐吉琳,谢定义,石玉成.土结构性的研究方法及现状[J].西北地震学报,2001,23(1):99-103.(QI Jilin,XIE Dingyi,SHI Yucheng.Status quo and method of quantitative study on soil structure[J].Northwestern Seismological Journal,2001,23(1):99-103.(in Chinese))
[8]蒲毅彬,陈万业,廖全荣,等.陇东黄土湿陷过程的CT结构变化研究[J].岩土工程学报,2000,22(1):49-54.(PU Yibin,CHEN Wanye,LIAO Quanrong,et al.Research on CT structure changing for damping process of loess in Longdong[J].Chinese Journal of Geotechnical Engineering,2000,22(1):49-54.(in Chinese))
[9]雷胜友,唐文栋.黄土在受力和湿陷过程中微结构变化的CT扫描分析[J].岩石力学与工程学报,2004,23(24):4166-4169.(LEI Shengyou,TANG Wendong.Analysis of microstructure change for loess in the process of loading and collapse with CT scanning[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(24):4166-4169.(in Chinese))
[10]陈正汉,谢云,孙树国,等.温控土工三轴仪的研制及其应用[J].岩土工程学报,2005,27(8):928-933.(CHEN Zhenghan,XIE Yun,SUN Shuguo,et al.Temperature controlled triaxial apparatus for soils and its application[J].Chinese Journal of Geotechnical Engineering,2005,27(8):928-933.(in Chinese))
[11]陈正汉,卢再华,蒲毅彬.非饱和土三轴仪的CT机配套及其应用[J].岩土工程学报,2001,23(4):387-392.(CHEN Zhenghan,LU Zaihua,PU Yibin.The matching of computerized tomography with triaxial test apparatus for unsaturated soil[J].Chinese Journal of Geotechnical Engineering,2001,23(4):387-392.(in Chinese))
[12]陈正汉,孙树国,方祥位,等.多功能土工三轴仪的研制及其应用[J].后勤工程学院学报,2007,23(4):1-5.(CHEN Zhenghan,SUN Shuguo,FANG Xiangwei,et al.Development and application of multi-function triaxial apparatus for soil[J].Journal of Logistical Engineering University,2007,23(4):1-5.(in Chinese))
[13]朱元青,陈正汉.研究黄土湿陷性的新方法[J].岩土工程学报,2008,30(4):524-528.(ZHU Yuanqing,CHEN Zhenghan.A new method of studying collapsibility of loess[J].Chinese Journal of Geotechnical Engineering,2008,30(4):524-528.(in Chinese))
[14]李加贵,陈正汉,黄雪峰,等.非饱和Q3黄土在侧向卸荷过程中的细观结构演化及强度特性研究[J].岩土力学,2010,31(4):1084-1091.(LI Jiagui,CHEN Zhenghan,HUANG Xuefeng,et al.CT-triaxial shear tests on the meso-structure evolution and strength of unsaturated Q3loess during unloading confining pressure[J].Rock and Soil Mechanics,2010,31(4):1084-1091.(in Chinese))
[15]朱元青.基于细观结构变化的非饱和原状湿陷性黄土的本构模型研究[博士学位论文][D].重庆:解放军后勤工程学院,2008.(ZHU Yuanqing.Study of unsaturated and collapsibility model of loess at original state considering meso-structure evolution[Ph.D.Thesis][D].Chongqing:Logistical Engineering University of PLA,2008.(in Chinese))
[16]方祥位.非饱和原状Q2黄土的湿陷机制及结构性本构模型研究[博士学位论文][D].重庆:解放军后勤工程学院,2008.(FANG Xiangwei.Study of collapse mechanism and structural model of unsaturated Q2loess at original state[Ph.D.Thesis][D].Chongqing:Logistical Engineering University of PLA,2008.(in Chinese))
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