兰新高速铁路高寒区段路基冻害分析与整治

Analysis and Treatments of Subgrade Frost Damage in High Altitude and Cold Region Section of Lanzhou-Xinjiang High Speed Railway

对兰新高速铁路浩门至民乐区间路基冻害情况进行了调查并开展了相关试验研究,分析路基冻胀原因并提出整治措施。路基冻害在路堤段数量最多,过渡段次之,路堑段最少。发生冻害的地段多是低矮路堤和零断面换填路基。冻害区段地表水、地下水丰富,部分区段水位较高,导致路基在冬季负温作用下发生冻胀。建议对边坡及护道表面加以封闭,并设置隔水墙、排水沟、渗水盲沟、蒸发池等控制路基水分,以治理路基冻害。

The subgrade frost damage of Haomen to Minle section in Lanzhou-Xinjiang high speed railway was investigated and the relevant experimental research was carried out,the causes of subgrade frost heave was analyzed and the treatment measures were put forward. Most of subgrade frost damage happens in embankment section,followed by transition section,and there is a minimal amount of frost damage in cut section,the frost damage section is mainly the low embankment and replacement subgrade with zero section. The surface water and groundwater is rich in frost damage sections and the water level is higher in some sections,which leads to subgrade frost heave under the action of negative temperature in winter. Sealing the slope and the berm surface and setting the core wall,drainage ditch,infiltration filter ditch and evaporation pool for subgrade moisture control should be suggested to implement subgrade frost damage treatment.