原状黄土结构损耗研究
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摘要
依据土体结构性观点,通过分析增湿过程中黄土结构性变化机理,提出黄土结构损耗的概念,建立定量化描述黄土结构损耗的参数——增湿黄土结构损耗参数和增湿与荷载耦合时黄土的结构损耗参数,并研究增湿及其与荷载耦合作用对原状黄土结构损耗的影响规律。研究结果表明:增湿结构损耗参数随增湿含水率的增大而增大,且呈现下陡上缓的增长特点;增湿湿陷系数与增湿结构损耗参数之间具有较好的线性关系表明黄土结构损耗是黄土湿陷的内在原因;无论增湿还是加荷均会造成土体结构损耗,使增湿和荷载耦合作用下黄土的结构损耗参数随增湿含水率和荷载等级的增大而增大。
From the viewpoint of soil structural properties,the concept for the loss in structure of undisturbed loess was put forward according to the mechanism analysis of the loess structural variation during the moistening process.Quantitative parameters were given to describe the loss in loess structure,i.e.the parameter of loss in moistening loess structure and the parameter of loss in moistening-loading loess structure,and the effects of moistening and moistening-loading on the loss in structure of undisturbed loess were investigated.Research results show that the parameter of loss in moistening structure increases with the moistening water content characterized by the reduced slope of the curve.A good linear relationship between the moistening collapsibility parameter and the parameter of loss in moistening structure indicates that the loss in loess structure is the inherent reason of loess collapse.Both moistening and loading may cause the loss in loess structure.The parameter of loss in loess structure may increase with the moistening water content and the load level under the combined influence of moistening and loading.
From the viewpoint of soil structural properties,the concept for the loss in structure of undisturbed loess was put forward according to the mechanism analysis of the loess structural variation during the moistening process.Quantitative parameters were given to describe the loss in loess structure,i.e.the parameter of loss in moistening loess structure and the parameter of loss in moistening-loading loess structure,and the effects of moistening and moistening-loading on the loss in structure of undisturbed loess were investigated.Research results show that the parameter of loss in moistening structure increases with the moistening water content characterized by the reduced slope of the curve.A good linear relationship between the moistening collapsibility parameter and the parameter of loss in moistening structure indicates that the loss in loess structure is the inherent reason of loess collapse.Both moistening and loading may cause the loss in loess structure.The parameter of loss in loess structure may increase with the moistening water content and the load level under the combined influence of moistening and loading.
引文
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[20]刘保健,谢定义,郭增玉.黄土地基增湿变形的实用算法[J].岩土力学,2004,25(2):270-274(Liu Baojian,Xie Dingyi,Guo Zengyu.A practical method formoistening deformation of loess foundation[J].Rock andSoil Mechanics,2004,25(2):270-274(in Chinese))
[21]SL237—1999土工试验规程[S].北京:中国水利水电出版社,1999(SL237—1999Specification of soil test[S].Beijing:China WaterPower Press,1999(inChinese))
[22]沈珠江.广义吸力和非饱和土的统一变形理论[J].岩土工程学报,1996,18(2):1-9(Shen Zhujiang.Generalized suction and unified deformation theory forunsaturated soils[J].Chinese Journal of GeotechnicalEngineering,1996,18(2):1-9(in Chinese))
[23]胡再强,刘兰兰,李宏儒,等.非饱和黄土等效吸力的研究[J].岩石力学与工程学报,2010,29(9):1901-1906(Hu Zaiqiang,Liu Lanlan,Li Hongru,et al.Study ofequivalent suction of unsaturated loess[J].Chinese Journalof Rock Mechanics and Engineering,2010,29(9):1901-1906(in Chinese))
[2]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 Dingyi.Exploration of some new tendencies in research of loess soilmechanics[J].Chinese Journal of GeotechnicalEngineering,2001,23(1):3-13(in Chinese))
[3]谢定义,姚仰平,党发宁.高等土力学[M].北京:高等教育出版社,2008:45(Xie Dingyi,Yao Yangping,DangFaning.Advanced soil mechanics[M].Beijing:HigherEducation Press,2008:45(in Chinese))
[4]齐吉琳.土的结构性及其定量化参数的研究[D].西安:西安理工大学,1999(Qi Jilin.Soil structurecharacteristics and study of its quantitative parameter[D].Xi’an:Xi’an University of Technology,1999(inChinese))
[5]高国瑞.黄土湿陷变形的结构理论[J].岩土工程学报,1990,12(4):1-10(Gao Guorui.A structure theory forcollapsing deformation of loess soils[J].Chinese JournalGeotechnical Engineering,1990,12(4):1-10(inChinese))
[6]骆亚生,谢定义,邢义川.原状黄土的地区湿陷特性及其潜在湿陷率[J].西北农林科技大学学报:自然科学版,2002,30(5):90-95(Luo Yasheng,Xie Dingyi,XingYichuan.Regional collapse characteristics of intact loessand its rate of potential collapse[J].Journal of NorthwestSci-Tech University of Agriculture and Forestry:NaturalScience Edition,2002,30(5):90-95(in Chinese))
[7]汤连生.黄土湿陷性的微结构不平衡吸力成因论[J].工程地质学报,2003,11(1):30-35(Tang Liansheng.Synthetic effect of microstructure and uneven suction onloess subsidence[J].Journal of Engineering Geology,2003,11(1):30-35(in Chinese))
[8]袁中夏,王兰民,王峻.考虑非饱和土与结构特征的黄土湿陷性讨论[J].西北地震学报,2007,29(1):12-17,39(Yuan Zhongxia,Wang Lanmin,Wang Jun.Discussionwater collapsibility of loess considering unsaturated soil andstructure characteristics of loess[J].NorthwesternSeismological Journal,2007,29(1):12-17,39(inChinese))
[9]蒋希雁,陆培毅.黄土湿陷机理和影响因素分析[J].河北建筑工程学院学报,2004,22(1):25-27(JiangXiyan,Lu Peiyi.Analysis of the collapsible mechanismand effect factors of loess[J].Journal of Hebie Institute ofArchitectural Engineering,2004,22(1):25-27(inChinese))
[10]顾成权,方云.黄土湿陷性的微观结构研究[J].西部探矿工程,2003,15(10):1-3(Gu Chengquan,Fang yun.Microstructure of loess collapsibility[J].West-ChinaExploration Engineering,2003,15(10):1-3(in Chinese))
[11]沙爱民,陈开圣.压实黄土的湿陷性与微观结构的关系[J].长安大学学报:自然科学版,2006,26(4):1-4(Sha Aimin,Chen Kaisheng.Relationship betweencollapsibility and microstructure of compacted loess[J].Journal of Chang'an University:Natural Science Edition,2006,26(4):1-4(in Chinese))
[12]王延涛.常规物理力学性质指标在湿陷机理上的体现[J].铁道工程学报,2007,24(3):1-5(Wang Yantao.Mechanisms of collapse shown on physical mechanics indexof the routine soil test[J].Journal of Railway EngineeringSociety,2007,24(3):1-5(in Chinese))
[13]Shen Z J.Reduced suction and simplified consolidationtheory for expansive soils[C]//Proceedings of FirstInternational Conference on Unsaturated Soils,1995
[14]沈珠江.非饱和土简化固结理论及其应用[J].水利水运工程学报,2003(4):1-6(Shen Zhujiang.Simplifiedconsolidation theory for unsaturated soils and its application[J].Hydro-Science and Engineering,2003(4):1-6(inChinese))
[15]郭敏霞,张少宏,邢义川.非饱和原状黄土湿陷变形及孔隙压力特性[J].岩石力学与工程学报,2000,19(6):785-788(Guo Minxia,Zhang Shaohong,XingYichuan.Collapse deformation and pore pressurecharacteristics of unsaturated intact loess[J].ChineseJournal of Rock Mechanics and Engineering,2000,19(6):785-788(in Chinese))
[16]胡再强,刘兰兰,李宏儒,等.非饱和黄土等效吸力的研究[J].岩石力学与工程学报,2010,29(9):1901-1906(Hu Zaiqiang,Liu Lanlan,Li Hongru.Study of equivalentsuction of unsaturated loess[J].Chinese Journal of RockMechanics and Engineering,2010,29(9):1901-1906(inChinese))
[17]谢定义,齐吉琳,朱元林.土的结构性参数及其与变形-强度的关系[J].水利学报,1999(10):1-6(Xie Dingyi,Qi Jilin,Zhu Yuanlin.Soil structure parameter and itsrelations to deformation and strength[J].Journal ofHydraulic Engineering,1999(10):1-6(in Chinese))
[18]骆亚生.非饱和黄土在动、静复杂应力条件下的结构变化特性及结构性本构关系研究[D].西安:西安理工大学,2005(Luo Yasheng.Variation characteristics of soilstructure and structural constitutive relation of unsaturatedloess under static and dynamic complex stress conditions[D].Xi’an:Xi’an University of Technology,2005(inChinese))
[19]胡再强,沈珠江,谢定义.非饱和黄土的结构性研究[J].岩石力学与工程学报,2000,19(6):775-779(HuZaiqiang,Shen Zhujiang,Xie Dingyi.Research onstructural behavior of funsaturated loess[J].ChineseJournal of Rock Mechanics and Engineering,2000,19(6):775-779(in Chinese))
[20]刘保健,谢定义,郭增玉.黄土地基增湿变形的实用算法[J].岩土力学,2004,25(2):270-274(Liu Baojian,Xie Dingyi,Guo Zengyu.A practical method formoistening deformation of loess foundation[J].Rock andSoil Mechanics,2004,25(2):270-274(in Chinese))
[21]SL237—1999土工试验规程[S].北京:中国水利水电出版社,1999(SL237—1999Specification of soil test[S].Beijing:China WaterPower Press,1999(inChinese))
[22]沈珠江.广义吸力和非饱和土的统一变形理论[J].岩土工程学报,1996,18(2):1-9(Shen Zhujiang.Generalized suction and unified deformation theory forunsaturated soils[J].Chinese Journal of GeotechnicalEngineering,1996,18(2):1-9(in Chinese))
[23]胡再强,刘兰兰,李宏儒,等.非饱和黄土等效吸力的研究[J].岩石力学与工程学报,2010,29(9):1901-1906(Hu Zaiqiang,Liu Lanlan,Li Hongru,et al.Study ofequivalent suction of unsaturated loess[J].Chinese Journalof Rock Mechanics and Engineering,2010,29(9):1901-1906(in Chinese))
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