岛状冻土路基侧向位移地温响应数值模拟分析
|
摘要
在多年岛状冻土区由于地温环境的变化,导致公路路基为达到新的热稳定状态而不断发生自适应结构变形。当路基的侧向变形过大时,就会引发边坡滑塌、纵向开裂等严重的路基病害,从而直接影响公路的使用安全。掌握该类路基侧向位移的地温响应规律是提高公路设计质量的基础前提,因此,文中以实际工程为依托,采用有限元数值模拟的方法,对工后一年内的路基侧向位移进行了瞬态模拟分析,通过现场实测对比,提出了高纬度地区多年岛状冻土路基侧向位移的年周期性地温响应过程可分为冻结、过渡和融化3个阶段,并根据数值模拟结果,揭示了各阶段路基侧向位移的地温响应特征。
The adaptive structural deformation has been produced to make a new thermal stability of highway subgrade in patchy permafrost areas,which is caused by the changes of ground temperature environment,while under a given large deformation,it brings about a series of serious subgrade diseases such as slope sliding,longitudinal cracking and so on,so it affects the driving safety directly.Mastering the response laws of lateral displacement along with ground temperature is the basic premise of improving design quality for this highway,so based on the practical project,in this paper the transient process of lateral displacement is simulated and analyzedby finite element numerical simulation during one year after the project is completed,and after comparisons with the in-situ data,the results shows that the annual cyclical response process of lateral displacement along with ground temperature can be divided into three stages:freezing period,transition period and thawing period for the patchy permafrost subgrade in high latitudes,and then based on the numerical simulation results,the study presents the response characteristics of lateral displacement along with the ground temperature for each stage.
The adaptive structural deformation has been produced to make a new thermal stability of highway subgrade in patchy permafrost areas,which is caused by the changes of ground temperature environment,while under a given large deformation,it brings about a series of serious subgrade diseases such as slope sliding,longitudinal cracking and so on,so it affects the driving safety directly.Mastering the response laws of lateral displacement along with ground temperature is the basic premise of improving design quality for this highway,so based on the practical project,in this paper the transient process of lateral displacement is simulated and analyzedby finite element numerical simulation during one year after the project is completed,and after comparisons with the in-situ data,the results shows that the annual cyclical response process of lateral displacement along with ground temperature can be divided into three stages:freezing period,transition period and thawing period for the patchy permafrost subgrade in high latitudes,and then based on the numerical simulation results,the study presents the response characteristics of lateral displacement along with the ground temperature for each stage.
引文
[1]房建宏,李东庆,徐安花,等.多年冻土地区特殊路基工程措施应用技术[M].甘肃:兰州大学出版社,2016:53-57.
[2]符进,朱东鹏,张会建.共玉高速公路多年冻土特殊路基基底处理方法研究[J].公路,2016,(1):36-42.
[3]S Y Lutskiy,T V Shepitko,A Y Burukin.Technological risk regulation of the subgrade base stability in permafrost areas[J].Sciences in Cold and Arid Regions,2017,9(3):321-324.
[4]胡坤,封金财,杨兆.高温冻土抗拉强度试验研究[J].岩石力学与工程学报,2017,(S2):4267-4275.
[5]S F I Alabdullah,N S Taresh.Evaluation of soil reinforced with geogrid in subgrade layer using finite element techniques[J].International Journal of Geomate,2016,13(35):174-179.
[6]杨永平.前嫩公路冻土路基的处理技术及沉降观测[D].哈尔滨工业大学,2012:26-29.
[7]黄维平,杨永春,陈常龙.结构有限元分析基础及ANSYS应用[M].北京:中国铁道出版社,2017:217-221.
[8]M Abu-Farsakh,S Dhakal,Q Chen.Laboratory characterization of cementitiously treatedstabilized very weak subgrade soil under cyclic loading[J].Soils and Foundations,2015,55(3):504-516.
[9]汪飞,陈冬根,陈建兵.粗粒土抗冻融特性影响因素研究[M].公路,2016,(7):71-76.
[10]中华人民共和国公路工程行业标准.JTG B01-2014公路工程技术标准[S].北京:人民交通出版社,2014.
[11]王锐,程培峰,韩春鹏.高纬度多年冻土区路基工后沉降变形[J].长安大学学报:自然科学版,2017,37(3):43-49.
[2]符进,朱东鹏,张会建.共玉高速公路多年冻土特殊路基基底处理方法研究[J].公路,2016,(1):36-42.
[3]S Y Lutskiy,T V Shepitko,A Y Burukin.Technological risk regulation of the subgrade base stability in permafrost areas[J].Sciences in Cold and Arid Regions,2017,9(3):321-324.
[4]胡坤,封金财,杨兆.高温冻土抗拉强度试验研究[J].岩石力学与工程学报,2017,(S2):4267-4275.
[5]S F I Alabdullah,N S Taresh.Evaluation of soil reinforced with geogrid in subgrade layer using finite element techniques[J].International Journal of Geomate,2016,13(35):174-179.
[6]杨永平.前嫩公路冻土路基的处理技术及沉降观测[D].哈尔滨工业大学,2012:26-29.
[7]黄维平,杨永春,陈常龙.结构有限元分析基础及ANSYS应用[M].北京:中国铁道出版社,2017:217-221.
[8]M Abu-Farsakh,S Dhakal,Q Chen.Laboratory characterization of cementitiously treatedstabilized very weak subgrade soil under cyclic loading[J].Soils and Foundations,2015,55(3):504-516.
[9]汪飞,陈冬根,陈建兵.粗粒土抗冻融特性影响因素研究[M].公路,2016,(7):71-76.
[10]中华人民共和国公路工程行业标准.JTG B01-2014公路工程技术标准[S].北京:人民交通出版社,2014.
[11]王锐,程培峰,韩春鹏.高纬度多年冻土区路基工后沉降变形[J].长安大学学报:自然科学版,2017,37(3):43-49.