寒区高速铁路路基地温监测技术优化试验研究

Experimental Study on Ground Temperature Monitoring Technique Optimization for High Speed Railway Subgrade in Cold Region

选用中密粉土、砂土模拟寒区高速铁路路基冻土,并进行了冻土路基地温现场监测模拟试验。试验结果表明:寒区高速铁路路基填料应该选择合适的颗粒级配,土体的含水率过高时要结合工程情况固结排水;现场监测选用PVC管作为温度传感器放置的媒介较好,PVC管靠近自然环境的一端应该采取闭口处理,且应在同一时间点采集温度。提出了寒区高速铁路路基地温监测的优化方案。

Middle density silt and sandy soil were used to simulate the frozen soil of high speed railway subgrade in cold region,and the f ield monitoring simulation tests of frozen soil subgrade ground temperature was carried out.Test results show that suitable grain composition should be selected for subgrade f iller of high speed railway in cold region,the consolidation drainage must be combined with the engineering condition when the water content of the soil is too high,the PVC tube should be chosen as the placement media for temperature sensor when the temperature is monitored on site,and PVC pipe should be closed at one end near the natural environment and temperature should be collected at the same time.The optimization scheme of ground temperature monitoring for high speed railway subgrade in cold region was put forward in this paper.