科研之友
微信
新浪微博
Facebook
分享链接
摘要
In allusion to the situation that subgrade frost heaving occurred easily in the cutting of high speed railway in seasonal frozen soil region with more developed groundwater, study was conducted through numerical simulation by software SEEP/W on the regulation scheme for subgrade frost heaving by well point dewatering. Results show that, under the condition that the pump discharge of small water pump was 1.5 m3·h-1and the buried depth ranged from 5 to 7 m, the water level around the pump could be lowered to its bottom after continuous working for about 1.3 to 1.4 h. The pump buried depth of 6.7 m was more reasonable in well point dewatering. With this buried depth, 25 d was needed to pump the groundwater level in the cutting down to 3.8 m before winter. In winter, pumping with intervals could be adopted to ensure the groundwater level below 3.0 m of the maximum freezing depth and considering energy conservation. After the suspension of pumping, it would take 7.5 d (the maximum intermittent time of water pump) to raise the groundwater level at the cutting center from 3.8 to 3.0 m. Then, it would take 6 d for the groundwater level down to 3.8 m again when the water pump was started to work once again. After the test section was regulated by well point dewatering according to simulation analysis results, the maximum subgrade frost heaving was decreased from 11.6 mm in 2013 to 4.5 mm in 2014. The regulation effect for subgrade frost heaving is remarkable, which indicates the regulation scheme by well point dewatering set down according to simulation analysis results is reasonable.
- 出版日期2016
- 单位中南大学
