佛山地区典型土层冻胀特性及热力耦合计算  

Freezing Swelling Characteristics and Thermodynamic Coupling Calculation of Typical Soil in Foshan Area

作　　者：侯蓓蓓 郑军 郭书刚 HOU Beibei;ZHENG Jun;GUO Shugang(No.5 Construction Company Limited,China Construction First Group Corporation Limited,Beijing 100010,China;China Coal Guanghua Geological Engineering Company Limited,Handan 056004,China)

机构地区：[1]中建一局集团第五建筑有限公司,北京100010 [2]中煤光华地质工程有限公司,河北邯郸056004

出　　处：《建井技术》2022年第3期14-19,共6页Mine Construction Technology

摘　　要：以佛山轨道交通典型土层为研究对象,通过冻胀试验研究不同土层在不同冻结温度下的冻胀率及冻胀力,同时利用ANSYS有限元分析软件,进行联络通道冻结热力耦合数值计算。研究结果表明:在10℃温度条件下,中粗砂、粉细砂、粉质黏土的冻胀率分别为5.43%~6.85%、7.65%~8.76%、11.71%~11.96%;不同土体的冻胀率、融沉率不同,且受负温影响显著,较低温度下(-10℃、-1 5℃)的冻胀率和冻胀力较大;由冻胀引起的最大变形量发生在联络通道泵房位置正上方的地面处,约为2 cm,与此处现场实际监测的最大变形量2.1cm接近。Based on the typical soil in Foshan rail transportation system as a study object,with the study of the frost heave tests on the frost heave ratio and frost heave force of different soils under different freezing temperatures,the ANSYS finite element analysis software was applied to conduct the calculation of the freezing thermal coupling numerical values in the cross passage.The study results showed that under the condition of-10 ℃ temperature,the frost heave ratio of the medium-coarse sand,silty-fine sand and silty clay were 5.43%~6.85%,7.65%~8.76% and 11.71 %~11.96% individually.The different soil would have different frost heave ratio and thaw settlement ratio and would obviously be effected by the negative temperature as well as the frost heave ratio and frost heave force would be higher when the temperature was below-10 ℃ to-15 ℃.A max deformation caused by the frost heave at the right top surface ground of the pumping chamber in the cross passage of the tunnel was about 2 cm and was close to the 2.1 cm max deformation actually measured at the same site.

关 键 词：冻土 冻胀融沉 冻胀率 冻胀力 

分 类 号：TD265.34[矿业工程—矿井建设] U231.3[交通运输工程—道路与铁道工程]