|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | A pseudo-coupled numerical approach for stability analysis of frozen soil slopes based on finite element limit analysis method显示文摘To simplify the stability analysis of frozen soil slope, a pseudo-coupled numerical approach is developed. In this approach, the coupled heat transfer and water flow in frozen soils are simulated first, and based on the computed thermal-hydro field, the stability of frozen soil slope is evaluated. Although the shear strength for frozen soil is very complicated and is usually represented by a nonlinear MC failure criterion, a simple linear MC yield criterion is utilized. In this method, the internal friction angle is expressed as a function of volumetric ice content and the cohesion is fitted as a simple bilinear expression of T and volumetric water content. To assess slope stability, the limit analysis is employed in conjunction with the recently developed α-section search algorithm. A frozen soil slope example is used to examine the proposed pseudo-coupled numerical approach, and numerical studies validate its effectiveness. Based on numerical results, it is seen that slope stability may be remarkably influenced by warming air (or ground surface) temperature. With increasing ground surface temperature, slope stability indicated by FOS may reduce to 1.0, implying that warming air temperature could be a trigger of frozen soil slope failure. | Xi Chen JianKun Liu Yuan Feng Xu Li YaHu Tian JianHong Fang | 2013 | Research in Cold and Arid Regions2013，5，4： | 3 |
| 2 | Experimental Study of the Dynamic Properties of Cement-and Lime-Modified Clay Soils Subjected to Freeze-Thaw Cycles显示文摘 | LIU Jiankun WANG Tianliang TIAN Yahu | 2010 | Cold Regions Science and Technology2010，61，： | 1 |
| 3 | Numerical studies for the thermal regime of a roadbed with insulation on permafrost显示文摘 | Liu Jiankun Tian Yahu | 2002 | Cold Regions Science and Technology2002，35，： | 1 |
| 4 | Parametric Studies for the Temperature Regime of Roadbed with Thermal-Isolation Layer on Permafrost 显示文摘 | Jiankun LIU Yahu TIAN | 2002 | Cold Region Science and Technology2002，35，1： | 1 |
| 5 | Numerical studies for the thermal regime of aroadbed with insulation on permafrost 显示文摘 | Liu Jiankun Tian Yahu | 2002 | Cold Regions Science and Technology2002，35，1： | 1 |
| 6 | Research on EPS application to very wide highway embankments in permafrost regions显示文摘In order to maintain the thermal stability of very wide highway embankments in permafrost regions, the thermal isolation material EPS is often utilized. To examine the effects of this insulation on the China National Highway (G214), two-dimensional finite element analysis of temperature fields was conducted for varying widths of highway embankments with and without EPS insulation. The numerical results show that in permafrost regions the effect of thermal aggregation on asphalt pavement is more obvious when highway embankments are wider, and, specifically for the G214 highway, the insulation should be more than 25 cm thick for 24-m-wide embankments. However, considering other factors such as the structural rationality of the embankments and high engineering costs, it might not be feasible to install EPS insulation in 24-m-wide embankments of the G214 highway when the height of the embankments is less than 3.65 m. | YaHu Tian JianHong Fang YuPeng Shen | 2013 | Research in Cold and Arid Regions2013，5，4： | 1 |
| 7 | Monitoring and analysis of ground temperature and deformation within Qinghai-Tibet Highway subgrade in permafrost region显示文摘In order to study the stability of the Qinghai-Tibet Highway embankment at Chumaerhe in the permafrost region of northwest China, the ground temperature and deformation at different depths were monitored under the left and right shoulders of the embankment where thermosyphons were set up only on the left shoulder. Based on the monitored data, characteristics of ground temperature and deformation of the left and right shoulders are analyzed and discussed. The results show that the start time of freezing or thawing of the seasonal active layer was about one to two months later than that of the embankment body itself. The stability of each shoulder was mainly controlled by the settlement of different soil layers, whereas frost heave of soil had scarcely any effect on the stability of the embankment. For the left shoulder, the settlement was mainly influenced by the seasonal active layer and then by the embankment body itself, due to freeze-thaw cycles which may change the soil properties; however, the permafrost layer remained fairly stable. For the right shoulder, creep of the warm permafrost layer was the main influence factor on its stability, followed by settlement of embankment body itself, and finally settlement of the seasonal active layer. Compared with the deformation of the left shoulder, the permafrost layer under the right shoulder was less stable, which indicates that the thermosyphons had a significantly positive effect on the stability of warm permafrost. | YaHu Tian YuPeng Shen WenBing Yu JianHong Fang | 2015 | Research in Cold and Arid Regions2015，7，4： | 1 |
| 8 | A method used to determine the upper thermal boundary of subgrade based on boundary layer theory显示文摘In the numerical simulation of long-term subgrade temperature fields, the daily variation of soil temperature at a certain depth h is negligible. Such phenomenon is called the 'boundary layer theory.' Depth h is defined as the boundary layer thickness and the soil temperature at h is approximately equal to a temperature increment plus the average atmosphere temperature. In the past, the boundary layer thickness and temperature increment were usually extracted from monitored data in the field. In this paper, a method is proposed to determinate the boundary layer thickness and temperature increment. Based on the typical designs of highway or railway, the theoretical solution of boundary layer thickness is inferred and listed. Further, the empirical equation and design chart for determining the temperature increment are given in which the following factors are addressed, including solar radiation, equivalent thermal diffusivity and convective heat-transfer coefficient. Using these equations or design charts, the boundary layer thickness and temperature increment can be easily determined and used in the simulation of long-term subgrade temperature fields. Finally, an example is conducted and used to verify the method. The result shows that the proposed method for determining the upper thermal boundary of subgrade is accurate and practical. | QingBo Bai Xu Li YaHu Tian | 2015 | Research in Cold and Arid Regions2015，7，4： | 1 |
| 9 | Experimental study of the dynamic properties of cement- and lime-modified clay soils subjected to freeze–thaw cycles显示文摘 | Jiankun Liu Tianliang Wang Yahu Tian | 2009 | Cold Regions Science and Technology2009，，1： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员