基于温度-应力耦合效应的冻土高边坡稳定特性分析
|
摘要
以京新高速某季节性冻土高边坡为背景,通过考虑伴有相变的瞬态温度场与应力场耦合,运用有限元分析软件ANSYS,分别模拟研究了含水率、温度、坡率、有无护坡等因素对边坡位移场、应力场和温度场的影响,并通过比较边坡安全系数的大小,判断各因素对边坡稳定性的影响。计算结果表明:边坡稳定性与含水率、坡率、边坡高度呈负相关,即数值越大稳定性越低;而温度作为影响季冻区边坡稳定的重要外部条件,当负温值位于-10℃以上时,各个指标对其敏感度较高,随着温度的进一步降低,各指标对温度的灵敏度逐渐减小;此外,施作护坡可有效地减小边坡的最大位移和冻结深度,增强其稳定性。
Based on a seasonal frozen high slope in JING-XIN highway, the coupling effect of the instantaneous temperature field with phase change and the stress field was considered. By using the finite analysis software ANSYS, the influences of moisture content, temperature, slope rate, slope protection on the slope displacement filed, stress field and temperature field were simulated separately. Besides, by comparing the safety coefficients,the influences of these factors on slope stability were judged. The calculated results are as follows. moisture content, slope rate and slope height are negatively correlated to stability, that is, the greater the indicators the less stable the slope; while as one of the most important conditions which influence the stability of seasonal frozen slopes, when the temperature is below-10℃, the indicators are more sensitive, with the decrease of temperature, the sensitivities of these indicators decrease gradually; besides, the slope protection can effectively reduce the maximum displacement and frozen depth of slope, thus improving the stability of slope.
Based on a seasonal frozen high slope in JING-XIN highway, the coupling effect of the instantaneous temperature field with phase change and the stress field was considered. By using the finite analysis software ANSYS, the influences of moisture content, temperature, slope rate, slope protection on the slope displacement filed, stress field and temperature field were simulated separately. Besides, by comparing the safety coefficients,the influences of these factors on slope stability were judged. The calculated results are as follows. moisture content, slope rate and slope height are negatively correlated to stability, that is, the greater the indicators the less stable the slope; while as one of the most important conditions which influence the stability of seasonal frozen slopes, when the temperature is below-10℃, the indicators are more sensitive, with the decrease of temperature, the sensitivities of these indicators decrease gradually; besides, the slope protection can effectively reduce the maximum displacement and frozen depth of slope, thus improving the stability of slope.
引文
[1]周幼吾,郭东信,邱国庆,等.中国冻土[M].北京:科学出版社,2000.
[2]勒德武,牛富俊,李宁.青藏高原多年冻土区热融滑塌变形现场监测分析[J].工程地质学报,2006,14(05):677-682.
[3]孙意.青藏铁路五道梁地区保护冻土路基稳定性措施研究[D].西南交通大学,2004:33-95.
[4]宋高嵩,陈阳东,温福春,等.季冻区路基边坡的水稳定性影响分析与防治[J].公路交通科技,2005(6):65-67.
[5]牛富俊,程国栋,赖远明,等.青藏高原多年冻土区热融滑塌型斜坡失稳研究[J].岩土工程学报,2004,26(3):402-406.
[6]谷宪民.季冻区道路冻胀翻浆机理及防治研究[D].长春:吉林大学,2007:32-102.
[7]殷坤龙.国际滑坡研究的新进展[J].水文地质工程地质,2000,27(5):1-3.
[8]彭丽云,刘建坤,田亚护.粉质粘土的冻胀特性研究[J].水文地质工程地质,2009(6):62-67.
[9]赵坚.季冻区公路土质路堑边坡浅层稳定性分析[J].北方交通,2010(12):1-5.
[10]WEI SHAN,ZHANG CHENG-CHENG,GUO YING.Mechanism of shallow slide on soil soad sutting slope during spring in seasonal srozen segion[J].Applied Mechanics and Materials,2012:178-181.
[11]张世民.青藏铁路多年冻土路基热-力稳定性数值仿真分析[J].土木建筑与环境工程,2012(S1):82-87.
[12]KAY B D,GROENEVELT.On the interaction of water and heat transport in frozen and unfrozen soil[J].Soil Science,American Proceeding,1974(38):395-400.
[13]徐芝纶.弹性力学[M].4版.北京:高等教育出版社,2006.
[14]舒进.寒区隧道温度场特性试验研究与数值模拟[D].上海同济大学,2013:26.
[2]勒德武,牛富俊,李宁.青藏高原多年冻土区热融滑塌变形现场监测分析[J].工程地质学报,2006,14(05):677-682.
[3]孙意.青藏铁路五道梁地区保护冻土路基稳定性措施研究[D].西南交通大学,2004:33-95.
[4]宋高嵩,陈阳东,温福春,等.季冻区路基边坡的水稳定性影响分析与防治[J].公路交通科技,2005(6):65-67.
[5]牛富俊,程国栋,赖远明,等.青藏高原多年冻土区热融滑塌型斜坡失稳研究[J].岩土工程学报,2004,26(3):402-406.
[6]谷宪民.季冻区道路冻胀翻浆机理及防治研究[D].长春:吉林大学,2007:32-102.
[7]殷坤龙.国际滑坡研究的新进展[J].水文地质工程地质,2000,27(5):1-3.
[8]彭丽云,刘建坤,田亚护.粉质粘土的冻胀特性研究[J].水文地质工程地质,2009(6):62-67.
[9]赵坚.季冻区公路土质路堑边坡浅层稳定性分析[J].北方交通,2010(12):1-5.
[10]WEI SHAN,ZHANG CHENG-CHENG,GUO YING.Mechanism of shallow slide on soil soad sutting slope during spring in seasonal srozen segion[J].Applied Mechanics and Materials,2012:178-181.
[11]张世民.青藏铁路多年冻土路基热-力稳定性数值仿真分析[J].土木建筑与环境工程,2012(S1):82-87.
[12]KAY B D,GROENEVELT.On the interaction of water and heat transport in frozen and unfrozen soil[J].Soil Science,American Proceeding,1974(38):395-400.
[13]徐芝纶.弹性力学[M].4版.北京:高等教育出版社,2006.
[14]舒进.寒区隧道温度场特性试验研究与数值模拟[D].上海同济大学,2013:26.