路基填料冻胀性试验研究

Research on frost heaving of subgrade filling test

针对修建在季节性冻土区域高速铁路路基的防冻胀问题,在室内开展了路基填料的冻胀特性研究。通过冻融强度和冻胀量试验,对影响路基填料冻胀性的因素进行分析,指出含水率、细粒掺量及细粒土的塑性对冻胀性影响较大,而冰冻温度、冻融循环次数的影响较小。试验结果说明含水率是影响路基填料冻胀特性的主导因素,当含水率达到一定值时,即使是粗粒土,仍会产生相当可观的冻胀量。因此,采取有效的防排水措施对路基冻胀防治是至关重要的。

For the problem that the frost heaving of the high-speed railway subgrade, which was built in the seasonal frozen soil area, an indoor test for frost heaving of subgrade filling was done. Through the tests of freeze-thaw strength and frost heaving amount, the factors that affecting frost heaving of subgrade filling are analyzed. It points out that the water capacity, content of fine particle and plasticity of fine particle are the main effect factors for the frost heave of subgrade filling, while the freeze temperature and the cycle number of freeze-thaw are less affected. The test results show that the water capacity is the dominant factor to affect the frost heaving subgrade filling. When the water capacity is high enough, even the coarse grained soil, it still have a considerable frost heaving amount. As a result, effective measures of waterproof and drainage are important to prevent frost heaving of subgrade.