摘要
本文根据一个寒季末的地温观测资料,分析了昆仑山隧道的一个多年冻土沟谷地形的地温特征。采用数值模拟技术,模拟该沟谷地形地温变化情况,认为该区沟谷的冻融特征不同于非沟谷地形,其融化深度远大于该区的冻土上限,从而得出该冲沟存在一个未被冻结的通道;隧道工程对周边地温产生较大影响;最大冻结深度约10m,受气温影响的最大融化深度不超过4m。本研究为再认识多年冻土区沟谷地形的冻融特征提供了一条途径。
The ground temperature at a valley over Kunlun mountain tunnel in permafrost region is studied on the basis of geological observation information by the end of cold season, and it is cast back before tunneling by numerical simulation. It is presented that the frozen-thaw feature of the valley is different from the other, and the thawed depth under the valley is far greater than permafrost table of the area. So it is educed （ 1 ） there is a unfrozen channel underground the valley, （2） the ground temperature around the tunnel is affected to certain extent by tunneling, （3） the maximum frozen depth is about 10m, and the maximum thawed depth affected by air temperature is not over 4m. An approach is presented to rediscover property of permafrost at valley.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2006年第2期22-26,共5页
Hydrogeology & Engineering Geology
关键词
多年冻土
地温
数值模拟
permafrost
ground temperature
numerical simulation
