初始主应力方向角对黄土动变形特性影响研究
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摘要
建筑物和构筑物地基土体的主应力方向往往发生旋转,因此研究初始主应力方向角对黄土动变形特性的影响规律具有一定的现实意义。通过对不同初始应力状态下原状与重塑黄土进行动扭剪三轴试验,研究了初始主应力方向角对黄土动变形特性的影响规律,结果表明:在不同初始主应力方向角下,原状黄土抵抗剪切变形的能力大于重塑黄土;在其他条件相同的情况下,初始主应力方向角越大,黄土抵抗剪切变形的能力越弱;随着初始主应力方向角的增大,黄土的动剪切模量随动剪应变变化的规律呈现出减小的变化趋势,而阻尼比则呈现出增大的变化趋势;初始动剪切模量与最大动剪应力随初始主应力方向角的增大而减小。建议在初始平均主应力较大的情况下,考虑初始主应力方向角对黄土动变形特性的影响,试验成果可为黄土地区工程设计提供一定的参考。
The principal stress orientations of the soil mass of the foundations under buildings and structures are always rotated.Therefore,conducting research on the effects of initial angles of principal stresses on loess dynamic deformation properties is practically significant.Dynamic torsional shear triaxial tests were carried out on undisturbed and remodeled loess under different initial stress states.Influencing laws of initial angles of principal stresses on loess dynamic deformation properties were investigated.Results showed that capacities of resisting shear deformations of undisturbed loess are higher than that of remodeled loess under different initial angles of principal stresses.Under the same other conditions,the bigger the initial angles of principal stresses,the weaker the capacities for resisting shear deformations are.The changing laws of dynamic shear moduli of loess versus dynamic shear strains show a decreasing trend with increasing initial angles of principal stresses;while the changing laws of damping ratios show an increasing trend.Initial dynamic shear moduli and maximum dynamic shear stresses decrease with increasing initial angles of principal stresses.Therefore,the effects of initial angles of principal stresses on loess dynamic deformation properties should be taken into consideration under the condition of large initial average principal stresses.The test results could be used as a reference for project designs in loess areas.
The principal stress orientations of the soil mass of the foundations under buildings and structures are always rotated.Therefore,conducting research on the effects of initial angles of principal stresses on loess dynamic deformation properties is practically significant.Dynamic torsional shear triaxial tests were carried out on undisturbed and remodeled loess under different initial stress states.Influencing laws of initial angles of principal stresses on loess dynamic deformation properties were investigated.Results showed that capacities of resisting shear deformations of undisturbed loess are higher than that of remodeled loess under different initial angles of principal stresses.Under the same other conditions,the bigger the initial angles of principal stresses,the weaker the capacities for resisting shear deformations are.The changing laws of dynamic shear moduli of loess versus dynamic shear strains show a decreasing trend with increasing initial angles of principal stresses;while the changing laws of damping ratios show an increasing trend.Initial dynamic shear moduli and maximum dynamic shear stresses decrease with increasing initial angles of principal stresses.Therefore,the effects of initial angles of principal stresses on loess dynamic deformation properties should be taken into consideration under the condition of large initial average principal stresses.The test results could be used as a reference for project designs in loess areas.
引文
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[12]杨利国,骆亚生,李焱.主应力轴旋转对压实黄土动变形特性的影响[J].工程地质学报,2010,18(3):392-397.YANG Liguo,LUO Yasheng,LI Yan.Effect of principal stress rotation on dynamic deformation of compacted loess[J].Journal of EngineeringGeology,2010,18(3):392-397.(in Chinese)
[13]王志杰.复杂初始应力状态下黄土动剪切模量与阻尼比特性试验研究[D].杨凌:西北农林科技大学,2010:12-14.WANG Zhijie.Experimental study on dynamic shear modulus and damping ratio of loess under complex initial stress states[D].Yangling:Northwest A&F University,2010:12-14.(in Chinese)
[14]杨利国,骆亚生,李焱,等.初始应力条件对压实黄土动强度影响的研究[J].岩土力学,2010,31(1):87-91,98.YANG Liguo,LUO Yasheng,LI Yan,et al.Research on effect of initial stress conditions on dynamic strength of compacted loess[J].Rock andSoil Mechanics,2010,31(1):87-91,98.(in Chinese)
[15]Hardin B O,Drnevich V P.Shear modulus and damping in soils:design equation and curves[J].Journal of Soil Mechanics and Foundation Divi-sion,ASCE,1972,98(7):667-692.
[16]WANG Z J,LUO Y S,GUO H,et al.Effects of initial deviatoric stress ratios on dynamic shear modulus and damping ratio of undisturbed loess inChina[J].Engineering Geology,2012,143-144:43-50.
[2]胡仲有,骆亚生,李焱.不同地区黄土阻尼比变化特性试验研究[J].地震工程与工程振动,2010,30(2):167-172.HU Zhongyou,LUO Yasheng,LI Yan.Experimental study on damping ratio variation characteristics of loess in different areas[J].Journal ofEarthquake Engineering and Engineering Vibration,2010,30(2):167-172.(in Chinese)
[3]ZHANG D X,WANG G H.Study of the 1920 Haiyuan earthquake-induced landslides in loess(China)[J].Engineering Geology,2007,94(1-2):76-88.
[4]许兴旺,李肖伦.湿陷性黄土地区客运专线路基沉降观测分析[J].岩土力学,2010,31(1):233-236.XU Xingwang,LI Xiaolun.An observation and analysis of passenger dedicated line subgrade in collapsible loess zone[J].Rock and Soil Mechanics,2010,31(1):233-236.(in Chinese)
[5]李宁,程国栋,谢定义.西部大开发中的岩土力学问题[J].岩土工程学报,2001,23(3):268-272.LI Ning,CHENG Guodong,XIE Dingyi.Geomechanics development in civil construction in western China[J].Chinese Journal of GeotechnicalEngineering,2001,23(3):268-272.(in Chinese)
[6]许成顺.复杂应力条件下饱和砂土剪切特性及本构模型的试验研究[D].大连:大连理工大学,2006:1-2.XU Chengshun.Experimental study on shear behavior and constitutive model of saturated sands under complex shear loading[D].Dalian:DalianUniversity of Technology,2006:1-2.(in Chinese)
[7]王常晶,陈云敏.移动荷载引起的地基应力状态变化及主应力轴旋转[J].岩石力学与工程学报,2007,26(8):1698-1704.WANG Changjing,CHEN Yunmin.Stress state variation and principal stress axes rotation of ground induced by moving loads[J].Chinese Journalof Rock Mechanics and Engineering,2007,26(8):1698-1704.(in Chinese)
[8]王常晶,陈云敏.列车移动荷载在地基中引起的主应力轴旋转[J].浙江大学学报:工学版,2010,44(5):950-954.WANG Changjing,CHEN Yunmin.Principal stress axes rotation in ground induced by train moving load[J].Journal of Zhejiang University:Engineering Science,2010,44(5):950-954.(in Chinese)
[9]刘雪珠,陈国兴,储勇.列车引起的地基土应力状态变化的三维有限元分析[J].地震工程与工程振动,2010,30(2):159-166.LIU Xuezhu,CHEN Guoxing,CHU Yong.Stress states of soil elements induced by train passage on the basis of 3D finite element analysis[J].Journal of Earthquake Engineering and Engineering Vibration,2010,30(2):159-166.(in Chinese)
[10]刘元雪,郑颖人.含主应力轴旋转的土体平面应变问题弹塑性数值模拟[J].计算力学学报,2001,18(2):239-241.LIU Yuanxue,ZHENG Yingren.Elastoplastic numerical simulation of plane strain problems of soils involving rotation of principal stress axes[J].Chinese Journal of Computational mechanics,2001,18(2):239-241.(in Chinese)
[11]刘元雪,郑颖人.含主应力轴旋转的土体本构关系研究进展[J].力学进展,2000,30(4):597-604.LIU Yuanxue,ZHENG Yingren.Research development of soils constitutive relation involving principal stress axes rotation[J].Advances inMechanics,2000,30(4):597-604.(in Chinese)
[12]杨利国,骆亚生,李焱.主应力轴旋转对压实黄土动变形特性的影响[J].工程地质学报,2010,18(3):392-397.YANG Liguo,LUO Yasheng,LI Yan.Effect of principal stress rotation on dynamic deformation of compacted loess[J].Journal of EngineeringGeology,2010,18(3):392-397.(in Chinese)
[13]王志杰.复杂初始应力状态下黄土动剪切模量与阻尼比特性试验研究[D].杨凌:西北农林科技大学,2010:12-14.WANG Zhijie.Experimental study on dynamic shear modulus and damping ratio of loess under complex initial stress states[D].Yangling:Northwest A&F University,2010:12-14.(in Chinese)
[14]杨利国,骆亚生,李焱,等.初始应力条件对压实黄土动强度影响的研究[J].岩土力学,2010,31(1):87-91,98.YANG Liguo,LUO Yasheng,LI Yan,et al.Research on effect of initial stress conditions on dynamic strength of compacted loess[J].Rock andSoil Mechanics,2010,31(1):87-91,98.(in Chinese)
[15]Hardin B O,Drnevich V P.Shear modulus and damping in soils:design equation and curves[J].Journal of Soil Mechanics and Foundation Divi-sion,ASCE,1972,98(7):667-692.
[16]WANG Z J,LUO Y S,GUO H,et al.Effects of initial deviatoric stress ratios on dynamic shear modulus and damping ratio of undisturbed loess inChina[J].Engineering Geology,2012,143-144:43-50.
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