冻土与混凝土接触面直剪试验研究  

An Experimental Study on Direct Shear Tests of Frozen Soil-concrete Interface

作　　者：吕鹏[1] 刘建坤[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《铁道学报》2015年第2期106-110,共5页Journal of the China Railway Society

基　　金：国家自然科学基金(41171064);国家基础研究计划(2012CB026104)

摘　　要：为研究冻土与混凝土接触面的力学性质,利用土工粗颗粒土直剪试验系统进行一系列接触面直剪试验。试验得出的平均剪应力-水平位移曲线和垂直位移-水平位移曲线均表现出明显的分段特征。通过不同参数的对比试验,总结垂直压力、温度、含水量对接触面抗剪强度的影响,给出拟合的经验公式。提出接触面峰值抗剪强度和残余抗剪强度的原理,来解释选用不同参数时试验曲线的变化。In order to study the mechanical behavior of frozen soil-concrete interface,a series of direct shear tests were conducted on the large scale temperature-controlled direct shear apparatus for coarse grained soil.The same features can be found both on the average shear stress-shear displacement τ-u and vertical displacement-shear displacement ν-u curves.Through comparison tests with different factors,the influence of vertical pressure,temperature and water content on the shear strength of interface was summarized.Fitted empirical equations between factors and shear strength were presented.A theory regarding the peak shear strength and residual shear strength of the interface was proposed to explain the curve changes in the tests when different factors were applied.

关 键 词：冻土与混凝土接触面 力学特性 抗剪强度 

分 类 号：TU411.7[建筑科学—岩土工程]