季节性冻土地区高速铁路路基保温技术试验研究

合理的防冻胀基床结构是季节性冻土地区高速铁路防冻胀的关键。本文通过开展哈大高速铁路正线与线外现场足尺试验,对局部保温措施与全断面保温措施的有效性进行了研究。试验结果表明:路肩和线间局部保温措施只能减小保温部位的冻结深度和冻胀,不能抑制轨道结构处的冻胀,不适用于季节性冻土地区高速铁路防冻胀设计;全断面保温措施能够降低轨道结构处的冻结深度和冻胀,有较好的防冻胀效果,季节性冻土地区高速铁路路基可采用全断面保温基床结构进行防冻胀设计。

Experimental Study on Thermal Insulation Technique to Prevent Subgrade Frost-heaving for High Speed Railway in Seasonal Frozen Soil Region

The reasonable frost-heaving prevention structure is the core part of subgrade design for the high speed railway in seasonal frozen soil region.The paper studied on the validity of partial and overall thermal insulation methods by full scale field tests which were carried out on and outside the operating line separately.The experimental results show that the partial thermal insulation method,in which the thermal insulation boards are put on the shoulder and the center of the line,can just protect the parts with the thermal insulation boards,but the frost-heaving at the track structure can not be restrained.Partial thermal insulation method is not workable for the frost-heaving prevention design of high speed railway in seasonal frozen soil region.But the overall thermal insulation method can reduce the freezing depth and frost-heaving at the track structure,has better frost-heaving prevention effect than the partial thermal insulation method,and is workable to prevent subgrade frost-heaving for high speed railway in seasonal frozen soil region.