Abstract：Abstract：Research purposes： The Qinghai-Tibet Railway is the only railway connecting the Tibet regions, but in the salt lake area, the subgrade is highly susceptible to salt dissolution. Some engineering problems including roadbed subsidence, cracking, collapse might occur under the influences of salt dissolution. Considering the characteristics of regional precipitation and engineering activities, the main factors affecting the stability of the subgrade were analyzed through the investigation and geological survey in this paper, so that to provide basis for preventing and controlling the subgrade problems.
Research conclusions：(1) The filled railway subgrade is stable on the salt rock under arid climatic conditions. But in the plateau climate warming and wetting process, the subgrade strength decreases and road settlement increases, because of the seepage and overflowing of the salt lakes, along with the salty water dissolution. (2) The excessive exploitation of potash fertilizer causes sharp decline in the brine water level among the salt rock layers, and salt mining leads to huge amount of low salinity brine emission, resulting in dissolution increasing of the chlorine-dominated salt rock. The railway subgrade is damaged by dissolution karst cave and settlement, causing by the dissolution of salt cementation between soil grains. (3) Measures of laying clay after in-situ grouting, and soil protection berms were suggested to treat the problems of dissolution cave and settlement. (4) This research result can provide references for engineering planning and design under similar conditions in future.
高宝林1 王进昌1 李 勇2. 青藏铁路察尔汗盐湖路基盐溶病害研究[J]. 铁道工程学报, 2015, 32(5): 6-.
GAO Bao-lin1, WANG Jin-chang1, LI Yong2. Research on the Salt Soluble Disasters of Saline Lake Subgrade along the Qinghai-Tibet Railway in Chaerhan Salt Lake Region
Yang Junliu, Yang Jinchun, Zou Yushu. The Study on Experiments of Solution Mining Properties of Salt ［J］. Journal of Sichuan Union University (Engineering Science Edition)，1997(2):74-80．
Wu Lihua, Li Yong, Dong Jianhua. Experimental Study on Corrosion Characteristics of Rock Salt Subgrade under Stress in Chaerhan Salt Lake ［J］. Railway Standard Design,2014(9):10-13.
Huang Xiaobo, Zhou Lixin, He Shujun, etc. Study on Test of Saline Soil Ground Treatment with the Soaking and Dissolving Combined Dynamic Compaction Method ［J］. Rock and Soil Mechnics. 2006(11):2080-2084.
Yang Hairong, Jiang Fuqiang, Wang Xiang, etc. Characteristics of Salt Rock and Salt-dissolution Engineering Geology and Subgrade Construction in Chaerhan Salt Lake along Qinghai-Tibet Railway ［J］. Journal of Railway Engineering Society,2005(S):373-378.
Dong Yaping, Li Quan,Ge Hua,etc. Study on the Dissolution and Corrosion of Railway Basis Salt Lake Zone by Different Saliferouss Water at Room Condition ［J］. Journal of Salt Lake Research,1997(3):93-104.
Yang Wei, Ye Zhaoliang, Yang Guangqing, etc. Study of Feasibility of Calium Carbide Dust Improved Inshore Area Saline Soil for Highway Subgrade［J］. Rock and Soil Mechanics, 2009 (4): 1068-1072.
Long Wei, Cao Zengguo. Characteristics of Saline Soil and Method of Handling Foundation［J］. Geotechnical Engineering World,2002(4):43-45.
Li Zuoheng. Technique for Dealing with Soft Soil Foundation by Reinforcement Composite Layer［J］. Journal of Shijiazhuang Railway Institute,2007(2):45-48.
版权所有 © 2014 《铁道工程学报》编辑部