|
|
|
| Analysis of the Influence of Moisture Field Transfer on the Stability of Subgrade in Alpine Region |
| SUN Wen1, WU Ya - ping1, LI Jing1, SONG Li2 |
| (1. Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China; 2. The Third Engineering Group Co. Ltd of China Railway , Taiyuan , Shanxi 030000 , China) |
|
|
|
Abstract Research purposes: The construction of subgrade engineering in alpine region will form a secondary disease, secondary disease of the railway, highway subgrade and other buildings will produce a variety of hazards. It is very important to study the formation mechanisrm and development of the secondary unfavorable permafrost in the high altitude area to ensure the stability and safety of the project. Through the numerical analysis of thermal thaw sliding collapse and freeze up mounds of secondary unfavorable permafrost phenomenon, this paper put forward prevention and engineering protection measures of secondary disasters.
Research conclusions:Through study on the formation mechanism and change process of secondary harmful disasters in alpine region , the following conclusions are drawn ： (1) Considering effects of moisture field transfer , the influence of hot melt sulcus on the lateral inhomogeneous deformation of the subgrade will increase , which will form the disease of subgrade longitudinal cracks , seriously affect the subgrade stability. (2) Moisture field transfer makes the temperature field change significantly intensify and the deformation around the hot melt sulcus increase , repeated action of frost heave and thawing settlement under the influence of moisture field transfer will cause water into the subgrade side , which will threaten the stability of subgrade and safety of train operation , so it is necessary to take correct engineering measures to governance. (3) The research result provides a theoretical basis for the engineering construction in permafrost regions, and has the reference significance to the prevention of secondary unfavorable disaster.
|
|
Received: 07 July 2015
|
|
|
|
|
|
|
2015, Vol. 32 
