气候作用下红黏土边坡湿热迁移特性及数值模拟分析
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摘要
红黏土边坡的湿热迁移特性对土体强度及整体稳定性具有重要影响。为此,在广西桂林市桂林理工大学雁山校区内建立了红黏土边坡现场监测系统,跟踪监测红黏土边坡含水率和温度随季节的变化规律。在此基础上,利用有限元分析软件GeoStudio进行有限元数值模拟。结果表明:红黏土边坡的湿热特性受大气作用影响显著,土体含水率和温度随季节的变化呈正弦波动变化。土体含水率主要受降雨和蒸发的影响,土体温度主要受大气温度和太阳辐射影响。温度的变化随着深度的增加呈现明显的滞后性,温度的变化可以间接反映土体水分的迁移特性,两者的耦合作用促使土体湿热发生迁移。
Moisture and heat transfer characteristics of red clay slope is very important to the soil strength and its overall stability. Therefore, a red clay slope monitoring system has been established in Yanshan campus of Guilin University of Technology to track and monitor the seasonal variation of water content and temperature of red clay slope. On this basis, finite element analysis software Geostudio is adopted to carry out finite element numerical simulation. The results show that the moisture and heat characteristics of red clay slope have been significantly affected by atmospheric action, and the soil moisture content and temperature fluctuate sinusoidally with seasonal variation. Soil moisture content is mainly affected by rainfall and evaporation, and soil temperature is mainly affected by atmospheric temperature and solar radiation. Temperature changes show obvious hysteresis with the increase of depth. Temperature changes can indirectly reflect the characteristics of soil moisture migration. The coupling effect of the two factors promotes soil moisture and heat migration.
Moisture and heat transfer characteristics of red clay slope is very important to the soil strength and its overall stability. Therefore, a red clay slope monitoring system has been established in Yanshan campus of Guilin University of Technology to track and monitor the seasonal variation of water content and temperature of red clay slope. On this basis, finite element analysis software Geostudio is adopted to carry out finite element numerical simulation. The results show that the moisture and heat characteristics of red clay slope have been significantly affected by atmospheric action, and the soil moisture content and temperature fluctuate sinusoidally with seasonal variation. Soil moisture content is mainly affected by rainfall and evaporation, and soil temperature is mainly affected by atmospheric temperature and solar radiation. Temperature changes show obvious hysteresis with the increase of depth. Temperature changes can indirectly reflect the characteristics of soil moisture migration. The coupling effect of the two factors promotes soil moisture and heat migration.
引文
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[16] 王忠福,李冬冬,万天同.基于滑坡变形分区的锁固型滑坡稳定性分析研究[J].华北水利水电大学学报(自然科学版),2018,39(6):35-40.
[2] Fredlund D C.State of the Art:Analytical methods for slope stability analysis[C]//Proceedings of the 4th International Symposium on Landslides.Toronto,1984.
[3] Fredlund D G,Krahn J.Comparison of slope stability analysis methods of analysis[J].Canadian Geotechnical Journal,1977,14(3):439-439.
[4] Gasmo J,Hrizuk K,Rahardjo H,et al.Instrumentation of an unsaturated residual soil slope[J].Geotechnical Testing Journal,1999,22(2):134-143.
[5] 张士林.大气降雨强度下雨水入渗规律研究[J].岩土工程技术,2003(5):281-285.
[6] Craig W H ,Bujang B K H,Merrifield C M.Simulation of climatic conditions in centrifuge model tests[J].Geotechnical Testing Journal,1991,14(4):406-412.
[7] 孔令伟,陈建斌,郭爱国,等.大气作用下膨胀土边坡的现场响应试验研究[J].岩土工程学报,2007,29(7):1065-1073.
[8] 陈建斌,孔令伟,郭爱国,等.大气作用下膨胀土边坡的动态响应数值模拟[J].水利学报,2007,38(6):674-682.
[9] 陈颉,曾亚武.边坡稳定性分析的离散元极限平衡法研究[J].水利与建筑工程学报,2018,16(3):113-119.
[10] 王百升,倪万魁,郭叶霞.多种因素作用下非饱和黄土边坡稳定性分析[J].水利与建筑工程学报,2017,15(5):159-162.
[11] 陈昌富,秦海军.考虑强度参数时间和深度效应边坡稳定性分析[J].湖南大学学报(自然科学版),2009,36(10):1-6.
[12] 干湿循环下非饱和压实粘土边坡响应的模型试验研究[D].哈尔滨:哈尔滨工业大学,2011.
[13] 陈星,李建林,王家成.基于FLAC3D的边坡地震反应分析[J].中国农村水利水电,2010(1):59-62.
[14] 郑颖人,叶海林,黄润秋,等.边坡地震稳定性分析探讨[J].地震工程与工程振动,2010,30(2):173-180.
[15] 陈善雄,陈守义.考虑降雨的非饱和土边坡稳定性分析方法[J].岩土力学,2001,22(4):447-450.
[16] 王忠福,李冬冬,万天同.基于滑坡变形分区的锁固型滑坡稳定性分析研究[J].华北水利水电大学学报(自然科学版),2018,39(6):35-40.