高压对砂性颗粒材料破碎力学性能影响分析
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摘要
砂土小应变条件下动力特性的细观分析是解决工程微振动实践问题的重要依据。越来越多的大型基础设施的建设导致高压条件下,砂土的动力特性会因为颗粒材料状态的变化而发生改变。通过Ottawa砂、福建砂、粉煤灰三种不同颗粒材料在高压条件下应力应变、剪切波速、压缩波速以及侧向土压力系数等土力学参数的演化过程,对砂性颗粒的动力特性进行研究。研究结果表明,三种砂性颗粒在7 MPa左右压力下会产生破碎;颗粒的剪切波速和压缩波速会随着压力的增加而增加。侧向土压力系数在加载过程中增量较小;但是在卸载时会随着压力的减小而大幅增加;同时验证了弯曲压缩元可以在高压条件下可以正常工作。
The microscopic analysis of sand dynamic characteristics is an important factor for slightly vibration engineering practice. Sand's mechanical characteristics would change with the difference of the condition of particle materials under high pressure caused by more and more large infrastructure constructions. Ottawa,Fuzhou standard sand,fly ash are used; and the evolution of stress-strain curve,shear wave velocity,compressional wave velocity and coefficient of lateral pressure is measured to study the dynamic characteristics of particle materials. The results show that particle crushing would happen at 7 MPa. Shear wave velocity or compressional wave velocity would increase with the increase of loading pressure; coefficient of lateral pressure slightly increases at the loading stage; and it would quickly increase with the decrease of axial pressure at the unloading stage.
The microscopic analysis of sand dynamic characteristics is an important factor for slightly vibration engineering practice. Sand's mechanical characteristics would change with the difference of the condition of particle materials under high pressure caused by more and more large infrastructure constructions. Ottawa,Fuzhou standard sand,fly ash are used; and the evolution of stress-strain curve,shear wave velocity,compressional wave velocity and coefficient of lateral pressure is measured to study the dynamic characteristics of particle materials. The results show that particle crushing would happen at 7 MPa. Shear wave velocity or compressional wave velocity would increase with the increase of loading pressure; coefficient of lateral pressure slightly increases at the loading stage; and it would quickly increase with the decrease of axial pressure at the unloading stage.
引文
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2 Souza D J M.Compressibility of sand at high pressure[D].Cambridge:Massachusetts Institute of Technology,Cambridge,1958
3 Hendron A J.The behavior of sand in one-dimensional compression[M].Dietz:Moral and Arbeiterklasse,1963
4 Hagerty M M,Hite D R,Ullrich C R,et al.One-dimensional highpressure compression of granular media[J].Journal of Geotechnical Engineering,1993,119(1):1-18
5 Yamamuro J A,Bopp P A,Lade P V.One-dimensional compression of sands at high pressures[J].Journal of Geotechnical Engineering,1996,122(2):147-154
6 Nakata Y,Hyodo M,Hyde A F L,et al.Microscopic particle crushing of sand subjected to high-pressure one-dimensional compression[J].Soils and Foundations,Japanese Geotechnical Society,2001,41(1):69-82
7 Arslan H,Baykal G,Sture S.Analysis of the influence of crushing on the behavior of granular materials under shear[J].Granular Matter,2009,11(2):87-97
8赵光思,周国庆,朱锋盼,等.颗粒破碎影响砂直剪强度的试验研究[J].中国矿业大学学报,2008,37(3):291-294Zhao Guangsi,Zhou Guoqing,Zhu Fengpan,et al.Study of the effect of particle crushing on direct shear strength of sand[J].Journal of China Mining University,2008,37(3):291-294
9陆勇,周国庆,顾欢达.常压至高压下砂土强度、变形特性试验研究[J].岩石力学与工程学报,2016,35(11):2369-2376Lu Yong,Zhou Guoqing,Gu Huanda.Study of sand strength and deformation characteristic at constant pressure and high pressure condition[J].Journal of Rock Mechanics and Engineering,2016,35(11):2369-2376
10 Lawrence F V.Propagation of ultrasonic waves through sand[D].Cambridge:Massachusetts Institute of Technology,Cambridge,1968
11 Lawrence F V.Ultrasonic shear wave velocity in sand and clay[D].Cambridge:Massachusetts Institute of Technology,Cambridge,1965
12 Shirley D,Hamptin L D.Shear wave measurements in laboratory sediments[J].Journal of the Acoustical Society of America,1978,63(2):607-613
13 Dyvik R,Madshus C.Lab measurements of Gmax using bender elements[C]//Advances in the Art of Testing Soils under Cyclic Conditions Conference.Detroit:ASCE,1985:186-196
14 Uesugi M,Kishida H.Influencal factors of friction between stell and dry sands[J].Soils and Functions,1986,26(2):33-46
2 Souza D J M.Compressibility of sand at high pressure[D].Cambridge:Massachusetts Institute of Technology,Cambridge,1958
3 Hendron A J.The behavior of sand in one-dimensional compression[M].Dietz:Moral and Arbeiterklasse,1963
4 Hagerty M M,Hite D R,Ullrich C R,et al.One-dimensional highpressure compression of granular media[J].Journal of Geotechnical Engineering,1993,119(1):1-18
5 Yamamuro J A,Bopp P A,Lade P V.One-dimensional compression of sands at high pressures[J].Journal of Geotechnical Engineering,1996,122(2):147-154
6 Nakata Y,Hyodo M,Hyde A F L,et al.Microscopic particle crushing of sand subjected to high-pressure one-dimensional compression[J].Soils and Foundations,Japanese Geotechnical Society,2001,41(1):69-82
7 Arslan H,Baykal G,Sture S.Analysis of the influence of crushing on the behavior of granular materials under shear[J].Granular Matter,2009,11(2):87-97
8赵光思,周国庆,朱锋盼,等.颗粒破碎影响砂直剪强度的试验研究[J].中国矿业大学学报,2008,37(3):291-294Zhao Guangsi,Zhou Guoqing,Zhu Fengpan,et al.Study of the effect of particle crushing on direct shear strength of sand[J].Journal of China Mining University,2008,37(3):291-294
9陆勇,周国庆,顾欢达.常压至高压下砂土强度、变形特性试验研究[J].岩石力学与工程学报,2016,35(11):2369-2376Lu Yong,Zhou Guoqing,Gu Huanda.Study of sand strength and deformation characteristic at constant pressure and high pressure condition[J].Journal of Rock Mechanics and Engineering,2016,35(11):2369-2376
10 Lawrence F V.Propagation of ultrasonic waves through sand[D].Cambridge:Massachusetts Institute of Technology,Cambridge,1968
11 Lawrence F V.Ultrasonic shear wave velocity in sand and clay[D].Cambridge:Massachusetts Institute of Technology,Cambridge,1965
12 Shirley D,Hamptin L D.Shear wave measurements in laboratory sediments[J].Journal of the Acoustical Society of America,1978,63(2):607-613
13 Dyvik R,Madshus C.Lab measurements of Gmax using bender elements[C]//Advances in the Art of Testing Soils under Cyclic Conditions Conference.Detroit:ASCE,1985:186-196
14 Uesugi M,Kishida H.Influencal factors of friction between stell and dry sands[J].Soils and Functions,1986,26(2):33-46