主应力轴旋转条件下软黏土的非共轴研究

doi:10.13722/j.cnki.jrme.2014.0964

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (654 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要采用空心圆柱扭剪仪对杭州软黏土进行了一系列不排水试验，首先求得软黏土的弹性参数，在此基础上研究了主应力轴旋转条件下土体的非共轴特性，并探讨了中主应力系数、弹性应变、偏应力水平和次生各向异性对非共轴特性的影响。试验结果表明软黏土的非共轴特性虽与砂土存在相似之处却又不尽相同。主应力轴旋转条件下，无论原状黏土还是重塑黏土，其非共轴角均随主应力方向角增加而循环波动变化，且周期约为90°；非共轴角基本随中主应力系数的增加而减小；弹性应变对加载起始时刻的非共轴角影响较大，如果忽略弹性应变的影响，将高估土体的非共轴特性；偏应力水平对非共轴角的大小和发展趋势均存在一定的影响，且偏应力水平越大，非共轴角越小。对于重塑土的试验表明软黏土的非共轴特性并不完全由土体的初始各向异性所决定，次生各向异性的影响也很大。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章

关键词 ：软黏土, 非共轴, 弹性参数, 主应力轴旋转

Abstract：A series of undrained tests were carried out on Hangzhou soft clay with a hollow cylinder apparatu，and the elastic parameters were obtained at first，on the basis of which the non-coaxial development behavior of soft clay was studied as well as the influence of intermediate principal stress parameter，elastic strains，intermediate principal stress parameter，deviatoric stress and induced anisotropy on non-coaxiality. The results show that the non-coaxiality of soft clay is similar to that of sand，but they are far from identical. Regardless of intact soft clay or remodeled soft clay，the non-coaxial angle fluctuates with the increase of angle of principal stress，of which the cycle period is 90°. The non-coaxial angle basically decreases with the increase of intermediate principal stress parameter. The elastic strains have a significant effect on the angle of non-coaxiality at the beginning of loading，and it will overestimate the non-coaxiality of soft clay if not considering the elastic strains. The deviatoric stress has certain effect on the angle of non-coaxial as well as its development trend，and the larger the deviatoric stress is，the smaller the angle of non-coaxiality is. As to the test of remodeled soft clay，it shows that the non-coaxiality is not only entirely determined by the inherent anisotropy，the induced anisotropy also has a great impact.

Key words： soft clay non-coaxiality elastic parameter principal stress rotation

引用本文:

杨彦豪1.2.3，周建*2. 主应力轴旋转条件下软黏土的非共轴研究[J]. 岩石力学与工程学报, 2015, 34(06): 21-21.
YANG Yanhao1.2.3，ZHOU Jan2. THE NON-COAXIAL STUDY OF SOFT CLAY SUBJECTED TO PRINCIPAL STRESS ROTATION. , 2015, 34(06): 21-21.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0964 或 http://www.rockmech.org/CN/Y2015/V34/I06/21

[3]	YANG Y M，YU H S. Application of a non-coaxial of model in shallow foundation[J]. Geomechanics and Geoengineering，2006，1(2)：139-150. " target="_blank">
[4]	ROSCOE K H，BASSET R H，COLE E R L. Principal axes observed during simple shear of a sand[C]//4th European Conference on Soil Mechanics and Foundation Engineering. Oslo. 1967：231-237. " target="_blank">
[6]	SYMES M J，GENS A，HIGHT D W. Drained principal stress rotation in saturated sand[J]. Geotechnique，1988，38(4)：59-81. " target="_blank">
[7]	SYMES M J，GENS A，HIGHT D.W. Undrained anisotropy and principal stress rotation in saturated sand[J]. Geotechnique，1984，34(1)：11-27. " target="_blank">
[11]	严佳佳，周建，管林波，等. 杭州原状软黏土非共轴特性与其影响因素试验研究[J]. 岩土工程学报，2013，35(1)：96-102.(YAN Jiajia，ZHOU Jian，GUAN Linbo，et al. Experimental study on non-coaxiality and influence factors of intact Hangzhou soft clay[J]. Chinese Journal of Geotechnical Engineering，2013，35(1)：96-102. (in Chinese)).
[14]	BLANC M.，BENEDETTO D. TIOUAJNI S. Deformation characteristics of dry Hostun sand with principal stress axes rotation[J]. Soils and Foundations，2011，51(4)：749-760.
[8]	GUTIERREZ M，ISHIHARA，K. Non-coaxiality and Energy Dissipation in Granular Material[J]. Soils and Foundations. 2000，40(2)：49-59. " target="_blank">
[12]	杨彦豪，周建，温晓贵，等. 杭州软黏土非共轴特性的试验研究[J]. 岩土力学，2014，35(10)：2 861-2 867.(YANG Yanhao，ZHOU Jian，WEN Xiaogui，et al. Experimental study of non-coaxiality of Hangzhou soft clay[J]. Rock and Soil Mechanics，2014，35(10)：2 861-2 867.(in Chinese)). " target="_blank">
[1]	郑颖人，沈珠江，龚晓南，等. 岩土塑性力学原理：广义塑性力学[M]. 中国建筑工业出版社，2002.(ZHENG Yingren，SHEN Zhujiang，GONG Xiaonan. The Generalized plastic Mechanics- Principle of Plastic Mechanics for Geotechnique[M]. Beijing：China Architecture and Building Press，2002.(in Chinese)) " target="_blank">
[2]	张敏，杨蕴明，李琦，等. 含主应力轴旋转的朱应力路径对密砂临界状态的影响[J]. 岩石力学与工程学报，2013，32(12)，2 560-2 565. (ZHANG Min，YANG Yunming，LI Qi，et al. Influence of stress paths including principal stress rotation on critical state of dense sand[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(12)：2 560-2 565.(in Chinese)) " target="_blank">
[13]	GUTIERREZ M，ISHIHARA K. Flow theory for sand during rotation of principal stress direction[J]. Soils and foundations，1991，31(4)：121-132. " target="_blank">
[5]	WONG R K S，ARTHUR J R F. Sand Sheared by Stresses with Cyclic Variations in Directions[J]. Geotechnique，1986，36(2)：215-226. " target="_blank">
[9]	CAI Y Y. An experimental study of non-coaxial soil behavior using Hollow Cylinder Testing[Ph. D. Thesis][D]. Nottingham：University of Nottingham，2010. " target="_blank">
[10]	LADE P V，KIRKGARD M M. Effect of stress rotation and changes of b-values on cross-anisotropic behavior of natural，K0-consolidated soft clay [J]. Soils and Foundations，2000，40(6)：93-105. " target="_blank">
[15]	郑鸿镔. 主应力轴旋转下重塑黏土与原状黏土特性试验研究[D]. 杭州：浙江大学，2010.(ZHENG Hongbin. Experimental study of reconstituted clay and intact clay under principal stress rotation[D]. Hangzhou：Zhejiang University，2010.(in Chinese)) " target="_blank">
[16]	沈扬. 考虑主应力方向变化的原状软黏土试验研究[D]. 杭州：浙江大学，2007.(SHEN Yang. Experimental study on effect of variation of principal stress orientation on undisturbed soft clay[D]. Hangzhou：Zhejiang University，2007.(in Chinese)) " target="_blank">
[18]	Hardin B O，Blandford G E. Elasticity of particulate materials[J]. Journal of Geotechnical Engineering，1989，115(6)：788-805. " target="_blank">
[19]	童朝霞，张建民，于艺林，等. 中主应力系数对应力主轴循环旋转条件下砂土变形特性的影响[J]. 岩土工程学报，2009，31(6)：946-952.(TONG Zhaoxia，ZHANG Jianmin，YU Yilin，et al. Effect of intermediate principal stress parameter on deformation behavior of sands under cyclic rotation of principal stress axes[J]. Chinese Journal of Geotechnical Engineering，2009，31(6)：946-952.(in Chinese))
[20]	ISHIHARA K，TOWHATA I. Sand response to cyclic rotation of principal stress directions as induced by wave loads[J]. Soils and Foundations，1983，23(4)：11-26. " target="_blank">
[22]	NAKATA Y，HYODO M，MURATA H. Non-coaxiality of sand subjected to principal stress rotation[C]// Proceedings of the international symposium on prefailure deformation characteristics of geomaterial，Sapporo. Balkema A A. 1994，256-270. " target="_blank">
[17]	ATKINSON J H. Stiffness of fine-grained soil at very small strains[J]. Geotechnique，1995，45(2)：249-265. " target="_blank">
[21]	杨蕴明，柴华友，韦昌富. 非共轴本构模型的数值计算问题[J]. 岩土力学，2010，31(增2)：373-377.(YANG Yunming，CHAI Huayou，WEI Changfu. Numerical implementation of a yield vertex non-coaxial model[J]. Rock and Soil Mechanics，2010，31(Supp.2)：373-377.(in Chinese)) " target="_blank">