应力和应变控制下饱和砂土循环扭剪试验分析
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摘要
针对某些动荷加载为应变控制的工程问题,如大型工业振动机械的工作平台基础,为研究其动力学性质,利用空心圆柱扭剪仪,分别采用应力和应变控制两种加荷方式,对处于复杂初始应力状态,即不同中主应力系数下的饱和福建标准砂进行小应变循环扭剪试验研究。结果表明,不同加荷方式对土的骨干曲线和剪切模量没有影响;同剪应变幅值时,应变控制下土的阻尼比较应力控制略大;两种控制方式下,试样振动过程中的轴向变形均随着中主应力系数的增大而减小。可见,加荷方式对土的动力特性影响甚微,针对动应变控制的工程问题,在设备有限时可采用应力控制试验模拟代替。
In order to study the dynamic properties of some engineering problems,such as the platform foundation of the large-scale industrial vibration machine. The saturated sand in the complex initial stress state was tested by the hollow shear apparatus through the two modes of stress control and strain control,in which the medium principal stress coefficient varied. The results show that different loading modes have no effect on the shear modulus of soil,and both the damping ratio and pore pressure increment of soil under strain control are greater than that of stress control,in addition,under the both two control modes,the axial deformation of specimen decreases with the increase of the main stress coefficient in the test process. It is concluded that there is no significant difference between the two control modes on the dynamic characteristics of soil,and stress control test can be applied to the dynamic engineering problems of strain control when the equipment is limited.
In order to study the dynamic properties of some engineering problems,such as the platform foundation of the large-scale industrial vibration machine. The saturated sand in the complex initial stress state was tested by the hollow shear apparatus through the two modes of stress control and strain control,in which the medium principal stress coefficient varied. The results show that different loading modes have no effect on the shear modulus of soil,and both the damping ratio and pore pressure increment of soil under strain control are greater than that of stress control,in addition,under the both two control modes,the axial deformation of specimen decreases with the increase of the main stress coefficient in the test process. It is concluded that there is no significant difference between the two control modes on the dynamic characteristics of soil,and stress control test can be applied to the dynamic engineering problems of strain control when the equipment is limited.
引文
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11王志杰,骆亚生,王瑞瑞,等.不同地区原状黄土动剪切模量与阻尼比试验研究[J].岩土工程学报,2010,28(9):1464-1469Wang Zhijie,Luo Yasheng,Wang Ruirui,et al.Experimental study on dynamic shear modulus and damping ratio of undisturbed loess in different regions[J].Chinese Journal of Geotechnical Engineering,2010,28(9):1464-1469
12周辉,姜玥,卢景景,等.岩石空心圆柱扭剪试验系统研制[J].岩土力学,2018,39(4):1535-1542Zhou Hui,Jiang Yue,Lu Jingjing,et al.Development of hollow cylindertorsionalapparatusfor rock[J].Rock and Soil Mechanics,2018,39(4):1535-1542
13 Yi H E.Transformed triaxial apparatus of strain control and its application in soil unloading[J].Water Resources&Power,2010,28(6):36-38
14 Wang J,Xiao Z,Cai Y Q,et al.Experimental research on static and dynamic characteristics of cement soil under strain control[J].Journal of Zhejiang University,2010,44(10):1857-1862
15 Lei X Q,Henry W,Antonin F,et al.Some general remarks on hyperplasticity modelling and its extension to partially saturated soils[J].Zeitschrift Fürangewandte Mathematik und Physik,2016,67(3):64-74
16石兆吉.循环等幅应变作用下饱和砂土中孔隙水压力的变化规律[J].世界地震工程,1987,(3):37-41,60Shi Zhaoji.Variation regularity of pore water pressure in saturated sand under cyclic equal amplitude strain[J].World Earthquake Engineering,1987,(3):37-41,60
17郭莹.复杂应力条件下饱和松砂的不排水动力特性试验研究[D].大连:大连理工大学,2003Guo Ying,Experimental studies on undrained cyclic behavior of loose sands under complex stress conditions[D].Dalian:Dalian University of Technology,2003
18 Collins I F,Hilder T.A theoretical framework for constructing elastic/plastic constitutive models of triaxial tests[J].International Journal for Numerical&Analytical Methods in Geomechanics,2002,26(13):1313-1347
19 Hsieh P G,Ou C Y.Analysis of nonlinear stress and strain in clay under the undrained condition[J].Journal of Mechanics,2011,27(2):201-213
20 Li X.Non-coaxial behaviour of sand under various stress paths[J].Journal of Geotechnical&Geoenvironmental Engineering,2012,139(8):1381-1395
21孙静.岩土动剪切模量阻尼试验及应用研究[D].哈尔滨:中国地震局工程力学研究所,2004Sun Jing.Experiment and application studies on dynamic shear modulus and damping of geotechnical media[D].Harbin:Institute of Engineering Mechanics,China Earthquake Administration,2004
22徐干成.饱和砂土应力应变控制试验动力特性的比较[J].同济大学学报:自然科学版,1999,27(1):38-42Xu Gancheng.Comparison between stress-controlled and strain-controlled experiments on dynamic behaviors of saturated sands[J].Journal of Tongji University(Natural Science),1999,27(1):38-42
2郭莹,张小玲,栾茂田,等.初始中主应力系数对中密粉煤灰动模量阻尼比影响的试验研究[J].岩土力学,2008,29(3):591-595Guo Ying,Zhang Xiaoling,Luan Maotian,et al.Experimental study on effect of initial intermediate principal stress coefficient on dynamic shear modulus and damping ratio of medium-dense fly ash[J].Rock and Soil Mechanics,2008,29(3):591-595
3 Yang Z X,Li X S,Yang J.Undrained anisotropy and rotational shear in granular soil[J].Géotechnique,2007,57(4):371-384
4 Kumruzzaman K M,Yin J H H.Influences of principal stress direction and intermediate principal stress[J].Canadian Geotechnical Journal,2010,47:164-179
5杨利国.复杂初始应力条件下压实黄土动力特性的试验研究[D].西安:西北农林科技大学,2010Yang Liguo.Experiment study on dynamic characteristics of compacted loess under complexed initial stress conditions[D].Xi'an:Northwest A&F University,2010
6徐干成,郑颖人,谢定义.饱和砂土动应力应变特性的试验研究[J].土木工程学报,1995,28(2):63-71Xu Gancheng,Zheng Yingren,Xie Dingyi.Experiment study on dynamic stress-strain behavior of saturated sand[J].China Civil Engineering Journal,1995,28(2):63-71
7 Toshikazu K,Motoki K,Eiji Y.Evaluation of liquefication resistance of decomposed granite soil by strain controlled step-loading test[J].1998,53(3):132-133
8 Li D C,Wang M Y,Gao S H,et al.Study on dynamic backbone curve behavior of Zhoushan marine soil under strain control[J].Journal of Hebei University of Engineering,2015,32(3):7-14
9谢定义.土动力学[M].北京:高等教育出版社,2011Xie Dingyi.Soil dynamics[M].Beijing:Higher Education Press,2011
10谷川,王军,张婷婷,等.应力路径对饱和软黏土割线模量的影响[J].岩土力学,2013,38(12):3394-3402Gu Chuan,Wang Jun,Zhang Tingting,et al.Influence of stress path onsecantmodulusofsoftsaturated clay[J].Rock and Soil Mechanics,2013,38(12):3394-3402
11王志杰,骆亚生,王瑞瑞,等.不同地区原状黄土动剪切模量与阻尼比试验研究[J].岩土工程学报,2010,28(9):1464-1469Wang Zhijie,Luo Yasheng,Wang Ruirui,et al.Experimental study on dynamic shear modulus and damping ratio of undisturbed loess in different regions[J].Chinese Journal of Geotechnical Engineering,2010,28(9):1464-1469
12周辉,姜玥,卢景景,等.岩石空心圆柱扭剪试验系统研制[J].岩土力学,2018,39(4):1535-1542Zhou Hui,Jiang Yue,Lu Jingjing,et al.Development of hollow cylindertorsionalapparatusfor rock[J].Rock and Soil Mechanics,2018,39(4):1535-1542
13 Yi H E.Transformed triaxial apparatus of strain control and its application in soil unloading[J].Water Resources&Power,2010,28(6):36-38
14 Wang J,Xiao Z,Cai Y Q,et al.Experimental research on static and dynamic characteristics of cement soil under strain control[J].Journal of Zhejiang University,2010,44(10):1857-1862
15 Lei X Q,Henry W,Antonin F,et al.Some general remarks on hyperplasticity modelling and its extension to partially saturated soils[J].Zeitschrift Fürangewandte Mathematik und Physik,2016,67(3):64-74
16石兆吉.循环等幅应变作用下饱和砂土中孔隙水压力的变化规律[J].世界地震工程,1987,(3):37-41,60Shi Zhaoji.Variation regularity of pore water pressure in saturated sand under cyclic equal amplitude strain[J].World Earthquake Engineering,1987,(3):37-41,60
17郭莹.复杂应力条件下饱和松砂的不排水动力特性试验研究[D].大连:大连理工大学,2003Guo Ying,Experimental studies on undrained cyclic behavior of loose sands under complex stress conditions[D].Dalian:Dalian University of Technology,2003
18 Collins I F,Hilder T.A theoretical framework for constructing elastic/plastic constitutive models of triaxial tests[J].International Journal for Numerical&Analytical Methods in Geomechanics,2002,26(13):1313-1347
19 Hsieh P G,Ou C Y.Analysis of nonlinear stress and strain in clay under the undrained condition[J].Journal of Mechanics,2011,27(2):201-213
20 Li X.Non-coaxial behaviour of sand under various stress paths[J].Journal of Geotechnical&Geoenvironmental Engineering,2012,139(8):1381-1395
21孙静.岩土动剪切模量阻尼试验及应用研究[D].哈尔滨:中国地震局工程力学研究所,2004Sun Jing.Experiment and application studies on dynamic shear modulus and damping of geotechnical media[D].Harbin:Institute of Engineering Mechanics,China Earthquake Administration,2004
22徐干成.饱和砂土应力应变控制试验动力特性的比较[J].同济大学学报:自然科学版,1999,27(1):38-42Xu Gancheng.Comparison between stress-controlled and strain-controlled experiments on dynamic behaviors of saturated sands[J].Journal of Tongji University(Natural Science),1999,27(1):38-42