原状冻结砂土阻尼比的综合影响因素探究  

Research on Comprehensive Influencing Factors of the Damping Ratio of the Undisturbed Frozen Soil

作　　者：何菲[1] 王旭[1] 刘德仁[1] 张延杰[1] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《兰州交通大学学报》2016年第4期24-29,共6页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金地区基金(51268033);甘肃省科技计划资助(1606RJYA240);兰州交通大学青年科学基金(2016016)

摘　　要：对青藏铁路清水河DK1 047+000段原状冻结砂土进行室内动三轴试验研究,采用Tablecurver3D数据处理软件对阻尼比试验结果进行三维曲面生成,结果表明:当试验温度为-0.6^-10℃、围压为0.1~0.5 MPa、荷载振动频率为1~5Hz条件下,原状冻结砂土阻尼比分别与温度和加载频率呈单调增函数和单调减函数的关系,随围压的变化其值较为分散.阻尼比随温度和围压的综合作用呈片状微卷上升趋势,其中温度影响较为显著;温度—围压—阻尼比三维曲面为单调递增曲面;在频率和围压的综合作用下。Based on laboratory dynamic triaxial tests, the damping ratio test results of the undis- turbed frozen soil in the Qingshui River DK1047 ＋ 000 section of Qinghai Tibet railway are ob- tained,which is transferred to 3 dimension surface rendering by Tablecurver3D data processing software. The results show that when test temperature is -0.6～～-10 ~C ,confining pressure is 0.1～0.5 MPa and load vibration frequency is 1～5 Hz,the damping ratio increases with the enlargement of temperature,reduces with the increase of load frequency and the value is relatively dis- persed with the change of confining pressure. The damping ratio shows larnellar and slightly curled upward trend with comprehensive effect of temperature and confining pressure, and the in- fluence of temperature is more remarkable. The threedimensional curved surface of the tempera- ture-confining pressure-damping ratio shows a monotone increasing shape. The damping ratio shows approximate spiral upward trend with combined influence of temperature and confining pressure.

关 键 词：原状冻结砂土 阻尼比 动三轴试验 三维曲面 

分 类 号：TU445[建筑科学—岩土工程]