循环温度场下桩周土微观结构试验研究  

Experimental study on microcosmic properties of soil around piles under cyclic temperature field

作　　者：孟庆宇 常虹[2] MENG Qing-yu;CHANG Hong(Shen Kan Engineering&Technology Corporation.MCC,Shenyang 110169,China;Surveying and Exploration Engineering Institute,Jilin Jianzhu University,Changchun 130118,China)

机构地区：[1]中冶沈勘工程技术有限公司,沈阳110169 [2]吉林建筑大学测绘与勘查工程学院,长春130118

出　　处：《哈尔滨商业大学学报（自然科学版）》2023年第2期178-186,共9页Journal of Harbin University of Commerce：Natural Sciences Edition

基　　金：吉林省科技发展计划项目(20190303022SF);吉林省教育厅“十三五”科研项目(JJKH20180600KJ,JJKH20180604KJ)。

摘　　要：能量桩在运行过程中桩周土的温度会发生改变,进而会影响到土体的微观结构.为了得到能量桩桩周土的微观结构变化规律,结合室内模型试验,通过扫描电镜和核磁共振技术,对能量桩运行前后的桩周土进行了测试,利用IPP软件对扫描电镜得到的微观参数进行了定量分析.结果表明,循环温度场下能量桩中间部位的土体温度扩散速度快于两端部,土体温度沿径向呈递减趋势;能量桩的运行过程对桩周土的孔隙影响较大,使桩周土的孔隙变大,孔隙的定向角呈无序性发展;对土颗粒的定向性影响较大,使土颗粒的定向角呈无序性发展.During the operation of the energy pile,the temperature of the soil around the pile will change,which will affect the microstructure of the soil.Combined with the indoor model test,the pore characteristics of soil around piles were analyzed by sem and nuclear magnetic resonance(NMR),the microscopic parameters obtained by Sem were Quantitative analysis by IPP software when change rule of the microscopic structure of soil around the energy pile was explored.It is concluded that under the cyclic temperature field,the soil temperature in the middle of the energy pile diffuses faster than that at the two ends,and the soil temperature decreased along the radial direction;the running process of the energy pile had a great influence on the pores of the soil around the pile,which made the pores of the soil around the pile became larger,and the orientation angle of the pores developed to disordered.Similarly,the orientation of soil particles was greatly affected,so that the orientation Angle of soil particles developed to disordered.

关 键 词：循环温度场 微观结构 扫描电镜 核磁共振 桩周土 室内试验 

分 类 号：TU411.92[建筑科学—岩土工程]