粉粒含量对风积砂-水泥接触面冻结强度影响试验研究  

Experimental study on the effect of silt content onfreezing strength of aeolian sand-cement interface

作　　者：胡峻晖 崔宏环 谢直树 HU Junhui;CUI Honghuan;XIE Zhishu(Hebei University of Architecture,Zhangjiakou,Hebei 075000;Hebei Key Laboratory of Civil Engineering Diagnosis,Transformation and Disaster Resistance,Zhangjiakou,Hebei 075000)

机构地区：[1]河北建筑工程学院土木工程学院,河北张家口075000 [2]河北省土木工程诊断改造与抗灾重点实验室,河北张家口075000

出　　处：《河北建筑工程学院学报》2024年第1期86-92,共7页Journal of Hebei Institute of Architecture and Civil Engineering

摘　　要：土体与结构接触面的冻结强度是寒区基础抗冻拔设计的主要参数。为研究粉粒含量对风积砂-水泥接触面冻结强度的影响,对不同粉粒含量、法向应力和土体初始含水率条件下的界面进行了一系列直剪试验,并引入土体体积含冰量参数,来间接衡量界面冰胶结力的大小,结合摩尔库伦强度理论,定义界面强度参数,来研究不同粉粒含量下界面峰值剪切强度、界面冰胶结力以及界面强度参数的变化规律。结果表明:随着粉粒含量的增加,界面应力应变曲线硬化明显;冻结强度与粉粒含量呈现出正相关线性趋势,土体的初始含水率不会影响粉粒对冻结强度的增强效果。同时,在同一初始含水率条件下,随着粉粒含量的增加,界面冰胶结力不断减小,界面摩擦角不断变大,而界面粘聚力变化幅度不大。通过对试验结果的分析与讨论,得出粉粒含量对冻结强度的增强效果主要是其风积砂与界面摩擦力的增大造成的。The freezing strength of the interface between soil and structure is the main parameter for the design of frost resistance of foundation in cold regions.For the study of wind-blown sand-cement powder content on the influence of interface strength of frozen,with different powder content,normal stress and initial moisture content of soil under the condition of interface in a series of direct shear test,and introduce the soil parameters,volume of ice content to indirectly measure the interface cementation strength,the size of the ice with Mohr coulomb strength theory,define the interface strength parameters,To study the changes of peak shear strength,interfacial ice cementation force and interfacial strength parameters under different silt content.The results show that the interface stress-strain curves harden obviously with the increase of particle content.There is a positive linear correlation between freezing strength and silt content,and the initial moisture content of soil does not affect the enhancement effect of silt on freezing strength.At the same initial water content,with the increase of powder content,the interface ice cementation force decreases,the interface friction Angle increases,and the interface cohesion force changes little.Through the analysis and discussion of the test results,it is concluded that the enhancement effect of silt content on freezing strength is mainly caused by the increase of friction between aeolian sand and interface.

关 键 词：粉粒含量 接触面 冻结强度 影响因素 

分 类 号：TU5[建筑科学—建筑技术科学]