多年冻土区热融湖塘状态及侵蚀路基病害防治措施

近年来,随着气候变暖和青藏高原降水的逐年增加,青藏铁路沿线的热融湖塘数量和面积也明显增加,开始影响青藏铁路路基安全。通过现场调查和统计分析,对青藏铁路多年冻土的热融湖塘发育状态和应对措施进行研究,研究结论包括,随着气候变暖和青藏高原降水的逐年增加,青藏铁路沿线的热融湖塘数量和面积也明显增加,且离路基越来越近;青藏铁路路基两侧20 m范围内发育热融湖塘14处,部分热融湖塘已延伸至路基坡脚,严重影响地基多年冻土的稳定,进而影响路基稳定性;对影响铁路路基安全的2处典型热融湖塘进行分析,提出包括地表水、地下水双隔离及太阳能热棒增强冻土稳定性的措施。

In recent years,with the climate warming and the annual increase of precipitation on the Qinghai-Tibet Plateau,the number and area of hot-melt lakes and ponds along the Qinghai-Tibet Railway have also increased significantly,which began to affect the safety of the Qinghai-Tibet Railway roadbed.Through on-the-spot investigation and statistical analysis,the development status and countermeasures of hot-thawed lakes and ponds in permafrost of Qinghai-Tibet Railway are studied.The conclusions include:With the warming of climate and the increase of precipitation on the Qinghai-Tibet Plateau year by year,the number and area of hot-thawed lakes and ponds along the Qinghai-Tibet Railway also increase obviously,and they are getting closer and closer to the roadbed.There are 14 thermal thawing lakes and ponds developed within 20 m on both sides of the Qinghai-Tibet railway roadbed,and some of them have been extended to the foot of the roadbed slope,which seriously affects the stability of permafrost and roadbed.Two typical thermal thawing lakes and ponds that affect the safety of railway roadbed are analyzed,including the double isolation of surface water and groundwater and the measures of solar heat rod to enhance the stability of permafrost.