等应力和等孔隙比状态下的土-水特征曲线

邹维列; 王协群; 罗方德; 张俊峰; 叶云雪; 胡中威

doi:10.11779/CJGE201709020

等应力和等孔隙比状态下的土-水特征曲线 English Version

1. 武汉大学土木建筑工程学院,湖北武汉 430072;
2. 武汉理工大学土木工程与建筑学院,湖北武汉 430070;
3. 武汉建工集团股份有限公司,湖北武汉 430023;
4. 碧桂园房地产开发集团有限公司,广东佛山 528312

基金项目: 国家自然科学基金项目（51479148）; 防灾减灾湖北省重点实验室项目（三峡大学）（2016KJZ03）; 中央高校基本业务费专项资金项目（2042016kf1117）

详细信息

作者简介:
邹维列(1969- ),男,教授,博士生导师,主要从事非饱和土特性、土工合成材料应用原理、道路中的岩土工程问题等方面的教学和科研工作。E-mail: zwilliam@126.com。

通讯作者:
王协群，E-mail：xqscwang@126.com

中图分类号: TU411
计量
- 文章访问数: 0266
- HTML全文浏览量: 0
- PDF下载量: 0213
出版历程
- 收稿日期: 2016-05-31
- 发布日期: 2017-09-24

Experimental study on SWCCs under equal stress and equal void ratio states

1. School of Civil Engineering, Wuhan University, Wuhan 430072, China;
2. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430072, China;
3. Wuhan Construction Engineering Group Co., Ltd., Wuhan 430023, China;
4. Country Garden Real Estate Development Co., Ltd., Foshan 528312, China

摘要

摘要: 有研究结果表明,孔隙比是影响土-水特征曲线（SWCC）的直接因素,而应力状态是通过孔隙比影响SWCC的间接因素。然而相关文献中关于孔隙比对SWCC影响的试验研究,一般只控制了试样的初始孔隙比相同或者不同,而在SWCC试验过程中对试样的孔隙比并没有加以控制。为了深化对孔隙比和应力状态对SWCC影响的认识,以山东东营黏土为研究对象,采用应力相关土水特征曲线仪,对试样沿预定路径进行单向压缩或单向压缩-回弹以后,控制竖向应力或孔隙比在脱—吸湿SWCC试验过程中保持不变。结果表明：在本次吸力范围内（未超过400 kPa）的脱湿—吸湿过程中,即使竖向应力相同（等应力状态）,只要孔隙比不同,则SWCC就不同;但只要保持试验过程中试样孔隙比不变（等孔隙比状态）,则竖向应力的变化对SWCC几乎没有影响。等孔隙比状态下,即使竖向应力不同,但试样的进气值相近,脱/吸湿速率也几乎保持一致;等应力状态下,进气值随着孔隙比的增大而减小,脱—吸湿SWCC的滞回度和滞回圈面积随孔隙比增加而增大。研究结果对于建立SWCC模型时,如何选取模型参数具有理论指导意义。
- 等孔隙比状态 /
- 等应力状态 /
- 土-水特征曲线 /
- 基质吸力 /
- 单向压缩
Abstract: The existing laboratory test results in the literatures show that the void ratio is a direct factor affecting the soil-water characteristic curves (SWCCs), whereas the stress state is an indirect factor affecting SWCC, via void ratio. However, in the experimental investigations on the influence of void ratio on SWCCs in the literatures, only the initial void ratios of samples are controlled to keep the same or different, but the void ratios of samples during the SWCC tests are not controlled. In the present experimental study, the vertical stress and void ratio of samples after the unidirectional compression or compression-rebound along the scheduled paths are controlled to keep the same during the drying-wetting SWCC tests by means of a stress-dependent SWCC (SDSWCC) apparatus. The test results indicate that even if the vertical stress is identical (equal stress state), the SWCCs are different as long as the void ratio is different during the drying-wetting SWCC tests. As long as the void ratios of samples are consistent (i.e., equal void ratio state) during the drying-wetting SWCC tests, the change of vertical stress has little effect on SWCCs. Under an equal void ratio state, the drying/wetting rates and air-entry values (AEVs) of the samples are almost the same even if the applied vertical stresses are different. Under an equal stress state, the AEVs of samples decrease with the increasing void ratios of samples, and both hysteresis degree and area of hysteresis loop increase with the increasing void ratio of samples. This study provides valuable reference for one to choose the parameters for a SWCC model.
- equal void ratio state /
- equal stress state /
- soil-water characteristic curve /
- matric suction /
- unidirectional compression

HTML全文

参考文献(25)

[1]	VANAPALLI S K, FREDLUND D G, PUFAHL D E. The influence of soil structure and stress history on the soil-water characteristics of a compacted till[J]. Géotechnique, 1999, 49(2): 143-159.
[2]	NG C W W, PANG Y W. Experimental investigations of the soil-water characteristics of a volcanic soil[J]. Canadian Geotechnical Journal, 2000, 37(6): 1252-1264.
[3]	NG C W W, WONG H N, TSE Y M, et al. A field study of stress-dependent soil-water characteristic curves and permeability of a saprolitic slope in Hong Kong[J]. Géotechnique, 2011, 61: 511-521.
[4]	罗启迅, 黄靖, 陈群. 竖向应力及干密度对砾石土土-水特征曲线的影响研究[J]. 岩土力学, 2014, 35(3): 729-734. (LUO Qi-xun, HUANG Jing, CHEN Qun. Influence of vertical stress and dry density on soil-water characteristic curve of gravelly soil[J]. Rock and Soil Mechanics, 2014, 35(3): 729-734. (in Chinese))
[5]	胡孝彭, 赵仲辉, 倪晓雯. 应力状态对土-水特征曲线的影响规律[J]. 河海大学学报(自然科学版), 2013, 41(2): 150-155. (HU Xiao-peng, ZHAO Zhong-hui, NI Xiao-wen. Influence of stress state on soil-water characteristic curve[J]. Journal of Hohai University (Natural Sciences), 2013, 41(2): 150-155. (in Chinese))
[6]	张昭, 刘奉银, 赵旭光, 等. 考虑应力引起孔隙比变化的土水特征曲线模型[J]. 水利学报, 2013, 44(5): 578-585. (ZHANG Zhao, LIU Feng-yin, ZHAO Xu-guang, et al. A soil water characteristic curve model considering void ratio variation with stress[J]. Chinese Journal of Hydraulic Engineering, 2013, 44(5): 578-585. (in Chinese))
[7]	李志清, 胡瑞林, 王立朝, 等. 非饱和膨胀土SWCC研究[J]. 岩土力学, 2006, 27(5): 730-734. (LI Zhi-qing, HU Rui-lin, WANG Li-chao, et al. Study on SWCC of unsaturated expansive soil[J]. Rock and Soil Mechanics, 2006, 27(5): 730-734. (in Chinese))
[8]	张雪东, 赵成刚, 蔡国庆, 等. 土体密实状态对土-水特征曲线影响规律研究[J]. 岩土力学, 2010, 31(5): 1463-1468. (ZHANG Xue-dong, ZHAO Cheng-gang, CAI Guo-qing, et al. Research on influence of soil density on soil-water characteristic curve[J]. Rock and Soil Mechanics, 2010, 31(5): 1463-1468. (in Chinese))
[9]	褚峰, 邵生俊, 陈存礼. 干密度和竖向应力对原状非饱和黄土土水特征影响的试验研究[J]. 岩石力学与工程学报, 2014, 33(2): 413-420. (CHU Feng, SHAO Sheng-jun, CHEN Cun-li. Experimental research on influences of dry density and vertical stress on soil-water characteristic curves of intact unsaturated loess[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(2): 413-420. (in Chinese))
[10]	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): 85-93. (Chen Zheng-han. Deformation,strength, yield and moisture change of a remolded unsaturated loess[J]. Chinese Journal of Geotechnical Engineering, 1999, 21(1): 85-93. (in Chinese))
[11]	SUN D A, SHENG D C, XU Y F. Collapse behaviour of unsaturated compacted soil with different initial densities[J]. Canadian Geotechnical Journal, 2007, 44(6): 673-686.
[12]	孙德安. 非饱和土的水力和力学特性及其弹塑性描述[J]. 岩土力学, 2009, 30(11): 3217-3232. (SUN De-an. Hydro-mechanical behaviours of unsaturated soils and their elastoplastic modelling[J]. Rock and Soil Mechanics, 2009, 30(11): 3217-3231. (in Chinese))
[13]	王协群, 邹维列, 骆以道, 等. 考虑压实度时的土水特征曲线和温度对吸力的影响[J]. 岩土工程学报, 2011, 33(3): 368-372. (WANG Xie-qun, ZOU Wei-lie, LUO Yi-dao, et al. SWCCs and influence of temperature on matrix suction under different compaction degrees[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(3): 368-372. (in Chinese))
[14]	高燕希, 符力平. 非饱和土吸力的温度性质[J]. 力学与实践, 2003, 25(3): 55-56. (GAO Xi-yan, FU Li-ping. The temperature property of soil suction for unsaturated soils[J]. Mechanics in Engineering, 2003, 25(3): 55-56. (in Chinese))
[15]	李军, 刘奉银, 王磊, 等. 关于土水特征曲线滞回特性影响因素的研究[J]. 水利学报, 2015, 46(增刊1): 194-199. (LI Jun, LIU Feng-yin, WANG Lei, et al. A research of affect factor on hysteresis behavior for soil-water characteristic curve[J]. Chinese Journal Hydraulic Engineering, 2015, 46(S1): 194-199. (in Chinese))
[16]	FREDLUND D G, RAHARDJO H. Soil mechanics for unsaturated soils[M]. New York: John Wiley, 1993.
[17]	张芳枝, 陈晓平. 非饱和黏土变形和强度特性试验研究[J]. 岩石力学与工程学报, 2009, 28(增刊2): 3808-3814. (ZHANG Fang-zhi, CHEN Xiao-ping. Experimental study on characteristics of deformation and strength of unsaturated clay[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(S2): 3808-3814. (in Chinese))
[18]	戚国庆, 黄润秋. 基质吸力变化引起的体积应变研究[J]. 工程地质学报, 2015, 23(3): 491-497. (QI Guo-qing, HUANG Run-qiu. Laboratory rest study test study on volumetric strain due to a simple change of suction[J]. Journal of Engineering Geology, 2015, 23(3): 491-497. (in Chinese))
[19]	邹维列, 张俊峰, 王协群. 脱湿路径下重塑膨胀土的体变修正与土水特征[J]. 岩土工程学报, 2012, 34(12): 2213-2219. (ZOU Wei-lie, ZHANG Jun-feng, WANG Xie-qun. Volume change correction and soil-water characteristics of remodeling expansive soil under dehydration path[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(12): 2213-2219. (in Chinese))
[20]	NG C W W, PANG Y W. Influence of stress state on soil-water characteristics and slope stability[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2000, 126(2): 157-166.
[21]	叶云雪, 周龙, 刘小文. 透水石对GEO-Experts土水特征曲线压力板仪排水的影响[J]. 煤田地质与勘探, 2015, 43(5): 74-78. (YE Yun-xue, ZHOU Long, LIU Xiao-wen. Permeable stones influence on the GEO-Experts SWCC pressure plate apparatus[J]. Coal Geology & Exploration, 2015, 43(5): 74-78. (in Chinese))
[22]	GENUCHTEN M T V. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J]. Soil Science Society of America Journal, 1980, 44(44): 892-898.
[23]	孔令伟, 李雄威, 郭爱国, 等. 脱湿速率影响下的膨胀土工程性状与持水特征初探[J]. 岩土工程学报, 2009, 31(3): 335-340. (KONG Ling-wei, LI Xiong-wei, GUO Ai-guo, et al. Preliminary study on engineering behaviors and water retention characteristics ofexpansive soil under influence of drying rate[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(3): 335-340. (in Chinese))
[24]	刘奉银, 张昭, 周冬, 等. 密度和干湿循环对黄土土-水特征曲线的影响[J]. 岩土力学, 2011, 32(增刊2): 132-136. (LIU Feng-yin, ZHANG Zhao, ZHOU Dong, et al. Effects of initial density and drying-wetting cycle on soil water characteristic curve of unsaturated loess[J]. Rock and Soil Mechanics, 2011, 32(S2): 132-136. (in Chinese))
[25]	GALLAGE C P K, UCHIMURA T. Effects of dry density and grain size distribution on soil-water characteristic curves of sandy soils[J]. Soils and Foundations, 2010, 50(1): 161-172.