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为研究寒区(季节冻土)L型挡土墙的冻胀防治措施,在日本国立北见工业大学冻土试验场进行了挡土墙的冻胀试验。挡土墙由无冻胀防治措施和有冻胀防治措施(置换工法)区间构成。通过3个冻融循环期的墙后土体温度、冻结面分布及墙体变形等的现场测试,验证了置换工法的有效性,并分析了挡土墙的冻胀破坏机理。另外,结合数值分析对各种挡土墙断面冻结面形状进行推算,提出了利用冻结指数或冻结深度确定墙后土体的置换范围的方法。
In order to study the control measures of frost heave in the L type retaining wall in the cold region (seasonal frozen soil), the frost heave test of the retaining wall was carried out in the frozen soil test site of Kitami University of Technology, Japan. Retaining wall by the non-frost heave prevention and control measures and frost heave prevention and control measures (replacement method) interval structure. The field tests of soil temperature, distribution of freezing surface and deformation of the wall after 3 freeze-thaw cycles have been carried out to verify the effectiveness of the replacement method and to analyze the failure mechanism of the retaining wall. In addition, combined with numerical analysis of various sections of retaining wall frozen surface shape projections, the use of freezing index or frozen depth to determine the displacement of soil wall replacement method.