铺设保温板的多年冻土边坡水热力耦合分析

发布时间：2018-06-01 00:36

本文选题：多年冻土边坡 + 保温板　；参考：《华中科技大学学报(自然科学版)》2017年01期

【摘要】：为了给保温板防护多年冻土边坡提供设计依据,基于水热力耦合理论,建立了铺设保温板的冻土边坡多场耦合分析模型,运用有限元法进行了求解,依托Matlab软件编制了计算程序,结合实例分析了铺设不同厚度保温板的边坡温度、水分、应力及位移变化规律.结果表明:保温板的最佳施工时间为冻结期结束时,厚度为5~7cm;融化期结束时,在冻融交界面处未冻水含量和剪应力均达到最大,且剪应力呈带状分布,水平位移分布呈凸肚状,随着保温板厚度增大,坡面附近高含量未冻水土层的厚度依次减小,剪应力最大值增大,水平位移明显减小;冻结期结束时,铺设保温板边坡的水平位移分布呈倾倒状.保温板阻止边坡上限下移有积极作用,能提高边坡的稳定性.
[Abstract]:In order to provide the design basis for protecting permafrost slope with thermal insulation board, a multi-field coupling analysis model of frozen soil slope with thermal insulation plate is established based on the theory of hydro-thermal coupling, and the solution is obtained by using finite element method. Based on the Matlab software, the calculation program is compiled, and the variation law of slope temperature, moisture, stress and displacement of different thickness insulation board is analyzed with an example. The results show that the optimum construction time of the insulation board is 5 ~ 7 cm at the end of the freezing period, and at the end of the melting period, the content of unfrozen water and shear stress at the freeze-thaw interface reach the maximum, and the shear stress is distributed in a zonal shape, and the horizontal displacement distribution is convex. With the thickness of the insulation board increasing, the thickness of the unfrozen soil and water layer with high content near the slope decreases in turn, the maximum shear stress increases and the horizontal displacement decreases obviously. At the end of the freezing period, the horizontal displacement distribution of the slope laid with the thermal insulation board is in a toppling shape. The insulation board can prevent the upper limit of slope from moving down and improve the slope stability.
【作者单位】：兰州理工大学甘肃省土木工程防灾减灾重点实验室;兰州理工大学西部土木工程防灾减灾教育部工程研究中心;兰州理工大学理学院;
【基金】：国家自然科学基金资助项目(51268037) 甘肃省杰出青年基金资助项目(145RJDA330) 陇原青年创新人才扶持计划资助项目(LYRC2014002) 兰州理工大学红柳杰出人才计划资助项目(J201403)
【分类号】：TU445

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