基于GDS室温条件下盐渍土强度特性的试验研究  

Laboratory research of strength characteristics of saline soil based on GDS at normal temperature

作　　者：张洪萍[1] 杨晓华[2] 韩云山[1] 

机构地区：[1]中北大学土木工程系,山西太原030051 [2]长安大学公路学院,陕西西安710064

出　　处：《中国地质灾害与防治学报》2011年第1期133-138,共6页The Chinese Journal of Geological Hazard and Control

基　　金：国家西部交通建设科技项目"盐渍土地区公路修筑成套技术研究"项目(200331879750)

摘　　要：以新疆(北疆)地区S201公路沿线的盐渍土为研究对象,通过三轴剪切试验对盐渍土的强度特性进行了较系统的研究。试验结果表明,盐渍土与非盐渍土在力学性能上没有本质的区别,即应力-应变曲线大致都呈双曲线型,抗剪强度与破坏面上的法向应力成正比,且符合库伦定律;含水量和含盐量的变化导致试样发生的破坏形式不同。在含水量低和含盐量高时,试件具有脆性破坏的特征,在含水量高和含盐量低时逐渐显示出塑性特征;含水量和含盐量的变化对盐渍土的强度参数有重要影响,其中对粘聚力C的影响较大,表现较明显,而内摩擦角仅对含水量的变化表现敏感;极限强度与含水量和含盐量之间的关系符合二次抛物线变化规律,在不同应力作用下,抛物线形式不同。This paper regarded Xinjiang（the north regions）saline soil as the research object,made a better systematic analysis and studied to the strength feature of saline soil through the tri-axial compression test.The results indicate that the saline soil has no essential difference in mechanical properties with non-saline soil,the result is the stress-strain relationships are conformed to hyperbolic curve mode,and the shearing strength is proportional to the principal stress of the failure plane;the variety of water and salt content brings the difference of the failure formation to the specimens.The specimen has obvious brittle failure with the lower water contents and higher salt content,but it tends to plastic behavior with the higher water and lower salt content;The change of water and salt content is enormously influential to strength parameters,it’s influence is more obvious to cohesion c,but the friction angle Φ is only more sensitive to the variation water content;The relationship between the limit strength and water content and salt content is a parabolic function,and the parabolic formation is different with the different stress.

关 键 词：盐渍土 含水量 含盐量 应力-应变关系 粘聚力 内摩擦角 极限强度 

分 类 号：TU444[建筑科学—岩土工程]