摘要
根据青藏铁路长期监测系统地温观测资料,选取2个典型路堑监测断面,研究路堑地段多年冻土不同深度处地温、多年冻土人为上限变化特征和地温演化规律。结果表明:青藏铁路路堑地段天然状态下多年冻土处于升温退化状态,地表以下2. 5 m处升温速率约为10. 0 m处的2. 5～3. 0倍,多年冻土自上而下的退化趋势明显;在全球气候变暖影响下,青藏铁路路堑地段地基多年冻土人为上限埋深均加深,多年冻土发生退化,且路堑堑底人为上限变化与天然孔基本一致; 2个断面左右侧堑底较天然场地地基多年冻土升温速度快,退化更严重,且左右侧差异极为明显。
Based on the long-term temperature monitoring data at two typical cutting monitoring sections of Q inghai-Tibet railway were selected,ground temperature at different depths of permafrost in cutting section,variation characteristics of upper limit of permafrost,and the ground temperature evolution were studied.The results show that the natural condition of Q inghai-Tibet railway cutting section permafrost is in heating degradation.The heating ratio at 2.5 m below the surface is 2.5 to 3 times the ratio at 10.0 m,indicating a signif icant degradation in vertical direction.Due to the global warming,the artif icial upper limit depth of Q inghai-Tibet railway cutting section foundation permafrost is getting deeper,permafrost degradation occurs,and the change of the artif icial upper limit at the cutting bottom is the same as that of the natural hole.At the cutting bottom at the two sections,the permafrost heating is faster than that under the natural condition.Furthermore,the degradation is more severe,and the difference at both sides of the cutting is obvious.
作者
孟进宝
杨永鹏
韩龙武
李勇
MENG Jinbao;YANG Yongpeng;HAN Longwu;LI Yong(Northwest Research Institute Co.Ltd.of C.R.E.C,Lanzhou Gansu 730000,China;Qinghai Province Key Laboratory of Permafrost and Environmental Engineering,Golmud Qinghai 816000,China)
出处
《铁道建筑》
北大核心
2018年第10期69-72,共4页
Railway Engineering
基金
中国铁路总公司科技研究开发计划(2016G003-D)
中国中铁股份有限公司科学技术项目(2013-重大-20-1)
科技部科研院所科技开发专项资金项目(2011EG123262)
关键词
青藏铁路
路堑
多年冻土
地基
人为上限
Q inghai-Tibet railway
Cutting
Permafrost
Foundation
Upper limit
