摘要
以新建格尔木至库尔勒铁路青海段软弱地基土勘察为例,综合运用现场调查、钻探、静探、室内土工试验、施工现场挤密试验等各种勘察方法,查清了软弱地基土层属中～高压缩性土,承载力较低,沉降量较大,渗透性相对较好,固结沉降速率较快。分析了软弱地基形成的原因及施工中可能遇到的问题。采取的处理措施：对于软弱地基厚度≤3 m的段落,路基地基采用A,B组填料挤密并重型碾压,涵洞地基采用挖除换填进行处理;对于软弱地基厚度〉3 m的段落,涵洞及路基地基均采用水泥搅拌桩复合地基进行加强处理。
Taking the survey of soft subsoil in Qinghai section of new-built Golmud-Korla railway as example,multiple survey methods were applied including field investigation,drilling,cone penetration test laboratory soil testing and compaction test on site.The soft soil was identified as a medium- high compressibility soil with low bearing capacity,large settlement good permeability and fast consolidation and settlement speed.The reasons for the formation of the soft subsoil and the problems encountered in construction were analyzed and corresponding treatments were suggested.For the soft subsoil less than 3 m,A and B packings were used in subgrade subsoil with heavy roller compaction,and excavation and replacement were required for culvert foundation.For the soft subsoil greater than 3 m,composite foundation with cement mixing piles were suggested in both culvert foundation and subgrade subsoil.
出处
《铁道建筑》
北大核心
2016年第11期104-106,共3页
Railway Engineering
关键词
软弱地基
渗透系数
挤密试验
路基沉降
水泥搅拌桩
Soft subsoil
Permeability coefficient
Compaction test
Subgrade settlement
Cement mixing pile
