干密度对预剪应力下重塑黄土动力特性影响的试验研究
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摘要
干密度是岩土工程建设中重要的控制指标。本文以不同干密度与不同初始平均主应力状态下重塑黄土为对象,通过进行主应力轴旋转(α0=45°)产生预剪应力条件下的动扭剪三轴试验研究,得出:干密度对预剪应力条件下重塑黄土动剪切模量的影响较小,而初始平均主应力对其有一定的影响;在其他条件相同时,动剪切模量与初始动剪切模量分别随干密度与初始平均主应力的增大而增大;阻尼比随动剪应变的增大先减小而后缓慢增大;干密度与初始平均主应力对重塑黄土阻尼比的影响不明显。
Dry density is an important controlling index of the geotechnical engineering constructions.With different dry densities and different initial average principal stresses,the dynamic torsional shear triaxial tests are carried out on remodeled loess under the condition of pre-shearing stress,which is produced by rotation of principal stress axes(α0=45°).Research results show that the dry density has little effect on the dynamic shear modulu of remodeled loess under the condition of pre-shearing stress.Initial average principal stress has some certain effect on the modulu.If other conditions being the same,the dynamic shear modulu and initial dynamic shear modulu increase with the increase of dry density and initial average principal stress.The damping ratios of remodeled loess first decrease with the increase of the dynamic shear strain and then increase gradually.The effects of dry density and initial average principal stress on damping ratio of remodeled loess are insignificant.
Dry density is an important controlling index of the geotechnical engineering constructions.With different dry densities and different initial average principal stresses,the dynamic torsional shear triaxial tests are carried out on remodeled loess under the condition of pre-shearing stress,which is produced by rotation of principal stress axes(α0=45°).Research results show that the dry density has little effect on the dynamic shear modulu of remodeled loess under the condition of pre-shearing stress.Initial average principal stress has some certain effect on the modulu.If other conditions being the same,the dynamic shear modulu and initial dynamic shear modulu increase with the increase of dry density and initial average principal stress.The damping ratios of remodeled loess first decrease with the increase of the dynamic shear strain and then increase gradually.The effects of dry density and initial average principal stress on damping ratio of remodeled loess are insignificant.
引文
[1]李又云,谢永利,刘保健.路基压实黄土动力特性的试验研究[J].岩石力学与工程学报,2009,28(5):1037-1046.
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[8]郭莹,栾茂田,史旦达,等.初始应力条件对松砂动力变形特性影响的试验研究[J].岩土力学,2005,26(8):1195-1200.
[9]沈扬,周建,张金良,等.低剪应力水平主应力轴循环旋转对原状黏土性状影响研究[J].岩石力学与工程学报,2008,27(增1):3033-3039.
[10]齐剑峰,栾茂田,杨庆,等.饱和黏土动剪切模量与阻尼比的试验研究[J].岩土工程学报,2008,30(4):518-523.
[11]付磊,王洪瑾,周景星.主应力偏转角对砂砾料动力特性影响的试验研究[J].岩土工程学报,2000,22(4):435-440.
[12]Hardin B O,Drnevich V P.Shear modulus and damping insoils:design equation and curves[J].Journal of Soil Mechan-ics and Foundation Division,ASCE,1972,98(7):667-692.
[13]谢定义.土动力学[M].西安:西安交通大学出版社,1988.
[14]骆亚生,田堪良.非饱和黄土的动剪模量与阻尼比[J].水利学报,2005,36(7):830-834.
[15]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.
[2]何丽君,石玉成,杨惠林,等.地震动作用下黄土边坡稳定性分析[J].西北地震学报,2009,31(2):142-147.
[3]徐舜华,王兰民,孙军杰,等.含水量对黄土震陷性定量影响研究[J].西北地震学报,2010,32(1):30-35.
[4]付磊,王洪瑾,周景星.主应力偏转角α0对土石坝动力计算结果的影响[J].水利学报,1999,(2):76-80.
[5]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.
[6]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.
[7]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.
[8]郭莹,栾茂田,史旦达,等.初始应力条件对松砂动力变形特性影响的试验研究[J].岩土力学,2005,26(8):1195-1200.
[9]沈扬,周建,张金良,等.低剪应力水平主应力轴循环旋转对原状黏土性状影响研究[J].岩石力学与工程学报,2008,27(增1):3033-3039.
[10]齐剑峰,栾茂田,杨庆,等.饱和黏土动剪切模量与阻尼比的试验研究[J].岩土工程学报,2008,30(4):518-523.
[11]付磊,王洪瑾,周景星.主应力偏转角对砂砾料动力特性影响的试验研究[J].岩土工程学报,2000,22(4):435-440.
[12]Hardin B O,Drnevich V P.Shear modulus and damping insoils:design equation and curves[J].Journal of Soil Mechan-ics and Foundation Division,ASCE,1972,98(7):667-692.
[13]谢定义.土动力学[M].西安:西安交通大学出版社,1988.
[14]骆亚生,田堪良.非饱和黄土的动剪模量与阻尼比[J].水利学报,2005,36(7):830-834.
[15]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.
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