多年冻土区宽幅路基中间隔离带安装热管数值模拟

Numerical Simulation of Heat Pipe Installed in the Middle Isolation Zone of Wide Subgrade in Permafrost Regions

为保护青藏高原多年冻土区宽幅路基或高等级路基中心下冻土热稳定性,提出了利用路基中间隔离带安装热管的措施.根据青藏高原多年冻土区宽幅路基或高等级公路实际的气温和地质条件,对近20年的数据进行了模拟分析.结果表明:在年平均气温为-4.0℃的青藏高原多年冻土区,考虑未来50年气温上升2.6℃的条件下,在路基中间隔离带安装热管能够有效抬升路基中心下人为冻土上限,确保高温多年冻土区宽幅路基或高等级路基的热稳定性.

In order to improve the thermal stability in permafrost under the wide subgrade or high grade subgrade center in Qinghai-Tibet Plateau permafrost region,a control measure,i.e.,installing heat pipe in the middle isolation belt in subgrade is proposed in this paper.The data of recent 20 years are simulated and analyzed.Results show that,in the condition of temperature rise 2.6℃in next 50 years in the permafrost region with average temperature of-4.0℃in Qinghai-Tibet Plateau permafrost regions,installing heat pipe in the middle of subgrade isolation zone can effectively uplift artificial up-limit in permafrost zone under subgrade center to ensure the subgrade in stability in the warm permafrost regions.