论文部分内容阅读
利用有限差分方法,分析隧道联络通道结构施工时混凝土水化热对人工冻结形成的冻土帷幕的影响。混凝土水化热的释放使得混凝土内温度急剧上升,之后受冻土帷幕低温和混凝土永久支护边界散热的影响,温度逐渐下降。混凝土水化热大量释放期间,冻土帷幕局部升温并融化,相界面移动迅速,并达到最大值。之后温度回落,经过几天的降温后,冻土开始回冻,冻土帷幕回冻速度比较缓慢。分析结果表明,常见的盾构隧道联络通道结构浇注的混凝土始终不会进入负温状态,混凝土不会因为冻土帷幕低温影响遭受冻害。
The finite difference method is used to analyze the influence of concrete hydration heat on frozen soil curtain formed by artificial freezing during the construction of tunnel connecting channel structure. Concrete heat of hydration makes the temperature inside the concrete rise sharply, and then by the low temperature of the frozen curtain and concrete permanent support boundary heat dissipation, the temperature gradually decreased. During the massive release of concrete hydration heat, the permafrost curtain warms up and melts locally, and the phase interface moves rapidly and reaches the maximum value. After the temperature dropped back, after a few days of cooling, the permafrost began to refreeze, permafrost curtain frozen relatively slowly. The analysis results show that the common concrete tunnel structure of the contact channel pouring concrete will not always enter the negative temperature state, the concrete will not be frost damage due to the low temperature of the frozen soil curtain.