摘要
为了快速准确掌握多年冻土边坡的冻融反应规律,基于水热力耦合理论,依托MATLAB编制了能反应土体多场耦合机制的有限元程序,与经典试验对比吻合较好,验证了程序的可靠性。据此开发了一套可独立运行、操作简便的多年冻土边坡水热力耦合分析软件,介绍了软件的功能和开发过程。结合算例分析了冻融作用下冻土边坡的反应特性,结果表明:不同时刻边坡的温度、水分、应力和位移有明显差别,在坡面冻融交界面出现剪应力最大值条带,边坡水平位移在冻结完成时,沿坡面大小基本相同,融化期结束时为上小、下大,融化时边坡的水平位移、未冻水含量均比冻结时大,而剪应力最大值却小;暖季多年冻土稳定性较差,开发的软件对冻土边坡工程冻融计算有重要应用价值。
In order to master the laws of freeze-thaw reaction of permafrost slope efficiently,the finite element program to reflect the multi-field coupling mechanism is written with MATLAB based on the moisture-heat-stress coupled theory.Compared with the classical test,the process matches well and is proved reliable.Hereby,the moisture-heat-stress coupled analysis software of permafrost slope that can run efficiently and independently is developed,and its function and development process are introduced.Based on an example,the freeze-thaw characteristics of permafrost slope is analyzed and the results show that the temperature,moisture,stress and displacement of the slope varies obviously at different times.The maximum band of shear stress appears at the freeze-thaw interface.The horizontal displacement is almost same along the slope surface after freezing,while it is smaller on the top of slope and larger at the bottom during thawing.The horizontal displacement and unfrozen water of the slope during thawing are both larger than that during freezing,while the maximum of shear stress becomes smaller.The permafrost slope is unstable in warm season.The software in the paper is of great importance for the freeze-thaw calculation of permafrost slope.
作者
董旭光
董建华
何天虎
代涛
孙国栋
DONG Xuguang;DONG Jianhua;HE Tianhu;DAI Tao;SUN Guodong(School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia 750021, China;Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, Gansu 730050, China;School of Sciences, Lanzhou University of Technology, Lanzhou, Gansu 730050, China)
出处
《中国地质灾害与防治学报》
CSCD
2020年第4期77-84,共8页
The Chinese Journal of Geological Hazard and Control
基金
宁夏自然科学基金(2018AAC03016)
国家自然科学基金(51808302)
宁夏青年科技人才托举工程第三批(TJGC2018093)
宁夏大学博士科研启动项目(2017067)。
关键词
多年冻土边坡
水热力耦合
冻融作用
软件开发
数值计算
permafrost slope
coupling of moisture,heat and stress fields
freeze-thaw
software development
numerical analysis
