常含水率三轴条件下非饱和原状黄土的吸力和力学特性

陈存礼; 张登飞; 董玉柱; 陈惠; 于佃博; 薛军秀

doi:10.11779/CJGE201407002

常含水率三轴条件下非饱和原状黄土的吸力和力学特性 English Version

1. 西安理工大学岩土工程研究所,陕西西安 710048; 2. 中国石油集团工程设计有限责任公司华北分公司,河北任丘 062550

基金项目: 国家自然科学基金项目（50878183）; 陕西省教育厅省级重点实验室重点科研项目（2010JS086）; 西安理工大学2012年度特色研究计划项目（118-211302）

详细信息

作者简介:
陈存礼(1964- ),女,陕西人,博士,教授,博士生导师,主要从事土静动力学特性研究。E-mail: chencl@xaut.edu.cn。

计量
- 文章访问数: 466
- HTML全文浏览量: 6
- PDF下载量: 20844
出版历程
- 收稿日期: 2013-11-14
- 发布日期: 2014-07-24

Suction and mechanical behaviours of unsaturated intact loess from constant water content triaxial tests

1. Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048, China; 2. North China Company of China Petroleum Engineering Co., Ltd., Renqiu 062550, China

摘要

摘要: 为了模拟实际工程在不排水条件下土体的快速破坏,对不同初始吸力非饱和原状黄土进行了常含水率等向压缩和三轴剪切试验,研究了常含水率下非饱和原状黄土的变形特性、临界状态、屈服及吸力变化特性。研究结果表明: 在等向压缩和三轴剪切应力条件下,非饱和黄土的变形和吸力变化特性不同;不同初始吸力下,偏应力与净平均应力临界状态线为平行直线,偏应力与有效平均应力临界状态线可以归一为一条直线,且可近似用饱和土临界状态线表示,半对数坐标系上孔隙比与净平均应力及有效平均应力临界状态线皆近似为平行直线,直线斜率比饱和土的大,比屈服后等向压缩曲线的小;对于不同初始吸力,相同有效平均应力下非饱和原状黄土与饱和黄土的临界状态孔隙比之比与气体饱和度关系可以归一;屈服净平均应力及屈服偏应力皆随着初始吸力的增大而增大;q-p平面上初始及后继屈服曲线为对称于K₀线的椭圆,吸力及应力硬化对屈服曲线的影响是等向的。
- 非饱和原状黄土 /
- 常含水率三轴试验 /
- 吸力 /
- 变形 /
- 临界状态 /
- 屈服
Abstract: A series of isotropic compression and triaxial shear tests under constant water content (CW) are performed on intact loess with various initial suctions to simulate the rapid destruction of soil mass in practical projects under undrained conditions. The variation characteristics of deformation, critical state, yield and suction of intact unsaturated loess are studied under the condition of constant water content. The results show that the isotropic compression and triaxial shear stress applied have different effects on the variation characteristics of deformation and suction of unsaturated loess. The critical state lines (CSLs) at different levels of initial suction on the deviator stress versus the net mean stress (q-p) plane are parallel, and a convergence of all the critical state points towards a single line much closer to the saturated CSL can be normalized whatever suctions on the deviator stress versus effective mean stress (q-p′) plane. The CSLs on the void ratio versus the net mean stress(e-lnp) and effective mean stress plane (e-lnp′) are parallel for different suctions, whose slopes are larger than those of saturated loess and smaller than those of isotropic compression curves after yielding. For different suctions, the relationships between the quotients e/e_s between unsaturated and saturated critical state void ratios at the same effective average stress against the values of the degree of saturated of the gas phase are unique. The net mean yield stress and deviator yield stress increase with the initial suction. The shape of the initial and subsequent yield curves on the deviator stress versus the mean net stress (q-p) plane are nearly elliptical and inclined about K₀ line. Respective mobilization of the yield curve either by suction or by stress hardening is isotropic.
- unsaturated intact loess /
- constant water content triaxial test /
- suction /
- deformation /
- critical state /
- yield

HTML全文

参考文献(19)

[1]	谢定义. 试论我国黄土力学研究中的若干新趋向[J]. 岩土工程学报, 2001, 23(1): 3-13. (XIE Ding-yi. Exploration of some new tendencies in research of loess soil mechanics[J]. Chinese Journal of Geotechnical Engineering, 2001, 23(1): 3-13. (in Chinese))
[2]	陈正汉. 重塑非饱和黄土的变形、强度、屈服和水量变化特性[J]. 岩土工程学报, 1999, 21(1): 82-90. (CHEN Zheng-han. Deformation, strength, yield and moisture change of a remolded unsaturated loess[J]. Chinese Journal of Geotechnical Engineering, 1999, 21(1): 82-90. (in Chinese))
[3]	孙文静, 孙德安, 张谨绎. 常含水率下非饱和高庙子膨润土加砂混合物的水力-力学性质[J]. 土木工程学报, 2011, 44(增刊): 161-164. (SUN Wen-jing, SUN De-an, ZHANG Jin-yi. Hydro-mechanical behaviour of unsaturated GMZ bentonite-sand mixture under undrained condition[J]. China Civil Engineering Journal, 2011, 44(S0): 161-164. (in Chinese))
[4]	李永乐, 张红芬, 佘小光, 等. 原状非饱和黄土的三轴试验研究[J]. 岩土力学, 2008, 29(10): 2859-2863. (LI Yong-le, ZHANG Hong-fen, SHe Xiao-guang, et al. Experimental study of triaxial test of undisturbed unsaturated loess[J]. Rock and Soil Mechanics, 2008, 29(10): 2859-2863. (in Chinese))
[5]	方祥位, 陈正汉, 申春妮, 等. 原状Q 2 黄土三轴剪切特性[J]. 岩石力学与工程学报, 2008, 27(2): 383-389. (FANG Xiang-wei, CHEN Zheng-han, SHEN Chun-ni, et al. Triaxial shear properties of undisturbed loess Q2[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(2): 383-389. (in Chinese))
[6]	BISHOP A W, BLIGHT G E. Some aspects of effective stress in saturated and unsaturated soils[J]. Géotechnique, 1963, 13(3) : 177-197
[7]	RAHARDJO H, HENG O B, LEONG E C. Shear strength of a compacted residual soil from consolidated drained and constant water content triaxial tests[J]. Canadian Geotechnical Journal, 2004, 41(3): 421-436.
[8]	THU T M, RAHARDJO H, LEONG E C. Shear strength and pore-water pressure characteristics during constant water content triaxial tests[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2006, 132(3): 411-419.
[9]	THU T M, RAHARDJO H, LEONG E C. Critical state behaviour of a compacted silt specimen[J]. Soils and Foundations, 2007, 47(4): 749-755.
[10]	GEISER F, LALOUI L, VULLIET L. Elasto-plasticity unsaturated soils: laboratory test results on a remoulded silt[J]. Soils and Foundations, 2006, 46(5): 545-556.
[11]	TOLL D G, ONG B H. Critical-state parameters for an unsaturated residual sandy clay[J]. Géotechnique, 2003, 53(1): 93-103.
[12]	GRAHAM J, NOONAN M L, LEW K V. Yield states and stress-strain relationships in a natural plastic clay[J]. Canadian Geotechnical Journal, 1983, 20(3): 502-516.
[13]	褚峰. 非饱和黄土吸力影响因素试验研究[D]. 西安: 西安理工大学, 2010. (CHU Feng. Experimental study on the influence factors on matrix suction of unsaturated loess[D]. Xi'an: Xi'an University of Technology, 2010. (in Chinese))
[14]	WHEELER S J, SIVAKUMAR V. An elasto-plastic critical state framework for unsaturated soil[J]. Géotechnique, 1995, 45(1): 35-53.
[15]	赵成刚, 张雪东. 非饱和土中功的表述以及有效应力与相分离原理的讨论[J]. 中国科学(E 辑), 2008, 38(9): 1530-1541. (ZHAO Cheng-gang, ZHANG Xue-dong. Derivation of the work expression and discussion on the effective principle and the phase separation theory in unsaturated soil[J]. Science in China (Ser. E), 2008, 38(9): 1530-1541. (in Chinese))
[16]	NUTH M, LALOUI L. Effective stress concept in unsaturated soils: Clarification and validation of a unified framework[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2008, 32(7): 771-801.
[17]	GALLIPOLI D, GENS A, SHARMA R, et al. A elasto-plastic model for unsaturated soil incorporating the effects of suction and degree of saturation on mechanical behaviour[J]. Géotechnique, 2003, 53(1): 123-135.
[18]	GALLIPOLI D, GENS A, CHEN Guang-jing, et al. Modelling unsaturated soil behaviour during normal consolidation and at critical state[J]. Computers and Geotechnics, 2008, 35(6): 825-834.
[19]	CUI Y J, DELAGE P. Yielding and plastic behaviour of an unsaturated compacted[J]. Géotechnique, 1996, 46(2): 291-311.

施引文献

资源附件(0)

计量

文章访问数: 466
HTML全文浏览量: 6
PDF下载量: 20844
被引次数: 0

常含水率三轴条件下非饱和原状黄土的吸力和力学特性 English Version

作者简介: 陈存礼(1964- ),女,陕西人,博士,教授,博士生导师,主要从事土静动力学特性研究。E-mail: chencl@xaut.edu.cn。

计量

出版历程

Suction and mechanical behaviours of unsaturated intact loess from constant water content triaxial tests

计量

出版历程

目录

作者简介:
陈存礼(1964- ),女,陕西人,博士,教授,博士生导师,主要从事土静动力学特性研究。E-mail: chencl@xaut.edu.cn。