多年冻土地区建筑物下的融化土是特有的后天形成的软土,它是建筑物与多年冻土之间热交换形成的软弱地基。融化软弱地基其深度和范围因建筑物热源多寡和跨度不同而异,融化深度曲线呈抛物线形,抛物线顶点(最大融深)一般在跨中,最大融深可达建筑物跨度的二分之一。此融化土地基习惯称为融化盘。因融化盘是后天性生成的,不可能象先天的软土那样,工程开始之前就采取相应的对策,其潜在的后天徐变往往给建筑物带来很大的危害。据伊图里河铁路分局调 Melting soil under buildings in permafrost is a peculiar acquired acquired form of soft soil, which is a weak foundation formed by heat exchange between buildings and permafrost. The depth and extent of melting soft ground vary depending on the amount of heat source and the span of the building, the melting depth curve is parabolic, the vertex of the parabola (maximum melting depth) is generally mid-span, and the maximum melting depth can reach one-half of the span of the building . This melting ground is commonly known as melting plate. Due to the melting plate is acquired, can not be like the innate soft soil as before the project began to take corresponding measures, its potential acquired creep often bring great harm to the building. According to Ituri River Railway Branch transferred