水泥改良土杯型冻土壁融化温度场三维数值模拟

发布时间：2018-03-30 06:40

本文选题：水泥改良土　切入点：冻土壁　出处：《煤田地质与勘探》2017年04期

【摘要】：为掌握水泥改良土杯型冻土壁的解冻规律,以南京地铁10号线过江隧道盾构出洞水平冻结加固工程为例,对水泥改良土杯型冻土壁融化温度场进行了三维数值模拟,并研究了导热系数、比热容、相变潜热等因素变化对融化温度场的影响规律。结果表明:冻结水泥土解冻速度受初始温度影响较小,受冻土位置影响较大;解冻过程中,冻土壁外侧1 m处的非冻结土温度先降后升,冻土壁外侧3~7 m处土体温度始终呈下降趋势;随着导热系数减小、相变潜热增大、比热容增大,解冻时间延长;比热容对冻结水泥土解冻过程的影响主要体现在升温阶段,相变潜热主要影响冻土相变阶段,导热系数既影响升温阶段又影响相变阶段。
[Abstract]:In order to understand the thawing rule of cement modified soil cup type frozen soil wall, taking the horizontal freezing and strengthening project of shield tunneling through river tunnel of Nanjing Metro Line 10 as an example, the thawing temperature field of cement modified soil cup type permafrost wall was simulated by three dimensional numerical simulation. The effects of factors such as heat conductivity, specific heat capacity and latent heat of phase transition on the melting temperature field are studied. The results show that the thawing speed of frozen cement soil is less affected by initial temperature and greatly affected by the location of frozen soil during the thawing process. The temperature of the unfrozen soil at 1 m outside the permafrost wall first decreases and then rises, and the soil temperature at 3 ~ 7 m outside the permafrost wall always shows a downward trend, and with the decrease of the thermal conductivity, the latent heat of phase change increases, the specific heat capacity increases, and the thawing time is prolonged. The effect of specific heat capacity on the thawing process of frozen cement-soil is mainly reflected in the stage of heating up, the latent heat of phase change mainly affects the phase transition of frozen soil, and the coefficient of thermal conductivity affects both the stage of heating up and the stage of phase transition.
【作者单位】：常熟理工学院;海南大学;
【基金】：住房和城乡建设部科技项目(2016-K5-060) 中国博士后科学基金资助项目(2015M580559)~~
【分类号】：U231.3;U455.43

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