冻结盐渍土强度特性试验研究
|
摘要
通过对冻结盐渍土进行三轴试验,研究不同冻结温度、冻融循环次数和围压的冻结盐渍土强度特性与本构关系。研究表明:冻结盐渍土的应力-应变关系曲线为应变硬化型,满足邓肯-张双曲线本构模型,并确定本构模型参数。冻结盐渍土随着应变增加,应力不断增加,曲线分为弹性变形阶段和塑性变形阶段两个变形阶段。随着围压的增加,冻结盐渍土的应力-应变关系曲线越高,早期强度、弹性模量和破坏强度增加,工程性能和抵抗变形能力增强,而冻结温度和冻融循环次数却与之相反。
Through the frozen saline soil in triaxial test,this paper studies the different freezing temperature,freezing and thawing cycles and confining pressure freeze saline soil strength characteristics and constitutive relation.Studies have shown that frozen saline soil stress-strain relationship curves of strain hardening model,can meet the Duncan-double curve,and determine the constitutive model and constitutive model parameters.The frozen saline soil with strain increases with the stress.The curve consists of two deformation stages for elastic deformation and plastic deformation phase.With the increase of confining pressure frozen saline soil stress-strain curve,the early strength,elastic modulus and fracture strength are on the increase,and the engineering properties and resistance to deformation ability are enhanced,while the freezing temperature and freezing and thawing cycles are in decrease.
Through the frozen saline soil in triaxial test,this paper studies the different freezing temperature,freezing and thawing cycles and confining pressure freeze saline soil strength characteristics and constitutive relation.Studies have shown that frozen saline soil stress-strain relationship curves of strain hardening model,can meet the Duncan-double curve,and determine the constitutive model and constitutive model parameters.The frozen saline soil with strain increases with the stress.The curve consists of two deformation stages for elastic deformation and plastic deformation phase.With the increase of confining pressure frozen saline soil stress-strain curve,the early strength,elastic modulus and fracture strength are on the increase,and the engineering properties and resistance to deformation ability are enhanced,while the freezing temperature and freezing and thawing cycles are in decrease.
引文
[1]徐斅祖,王家澄,张立新.冻土物理学[M].2版.北京:科学出版社,2010:1-378.
[2]吴紫汪,马巍.冻土强度与蠕变[M].兰州:兰州大学出版社,1994.
[3]崔托维奇H A.冻土力学[M].张长庆,朱元林,译.北京:科学出版社,25-43.
[4]邴慧,何平.冻融循环对含盐土物理力学性质影响的试验研究[J].岩土程学报,2009,31(12):1968-1962.
[5]邴慧.反复冻融作用下含盐土路基破坏机理研究[D].兰州:中国科学院寒区旱区环境与工程研究所,2008.
[6]邴慧,武俊杰,邓津.黄土状盐渍土洗盐前后物理力学性质的变化[J].冰川冻土,2011,33(4):796-800.
[7]陈锦,李东庆,邴慧,等.含水量对冻结含盐粉土单轴抗压强度影响的试验研究[J].冰川冻土,2012,34(2):441-446.
[8]杨成松,何平,程国栋,等.含盐冻结粉质黏土单轴抗压强度试验研究[J].工程力学,2006,23(1):144-148.
[9]陈炜韬,王鹰,王明年,等.冻融循环对盐渍土粘聚力影响的试验研究[J].岩土力学,2007,28(11):2343-2348.
[10]陈炜韬.环境因素变化对格尔木地区盐渍土剪强度参数的影响研究[D].成都:西南交通大学,2005.
[2]吴紫汪,马巍.冻土强度与蠕变[M].兰州:兰州大学出版社,1994.
[3]崔托维奇H A.冻土力学[M].张长庆,朱元林,译.北京:科学出版社,25-43.
[4]邴慧,何平.冻融循环对含盐土物理力学性质影响的试验研究[J].岩土程学报,2009,31(12):1968-1962.
[5]邴慧.反复冻融作用下含盐土路基破坏机理研究[D].兰州:中国科学院寒区旱区环境与工程研究所,2008.
[6]邴慧,武俊杰,邓津.黄土状盐渍土洗盐前后物理力学性质的变化[J].冰川冻土,2011,33(4):796-800.
[7]陈锦,李东庆,邴慧,等.含水量对冻结含盐粉土单轴抗压强度影响的试验研究[J].冰川冻土,2012,34(2):441-446.
[8]杨成松,何平,程国栋,等.含盐冻结粉质黏土单轴抗压强度试验研究[J].工程力学,2006,23(1):144-148.
[9]陈炜韬,王鹰,王明年,等.冻融循环对盐渍土粘聚力影响的试验研究[J].岩土力学,2007,28(11):2343-2348.
[10]陈炜韬.环境因素变化对格尔木地区盐渍土剪强度参数的影响研究[D].成都:西南交通大学,2005.