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粗粒土路基填料经冻融循环后会产生冻胀及密实度降低的问题,从而影响路基的稳定性,为了研究多年冻土区粗粒土路基填料经冻融循环后密实度降低的问题,对黏粒含量、含水率不同的粗粒土试件进行冻融循环试验,分析其回弹模量的衰减规律,以此来研究粗粒土的抗冻融特性。试验结果表明:粉黏粒掺量、含水率和冻融次数均是影响粗粒土抗冻融特性的因素。基于此,提出冻土地区路基填料粉黏粒含量控制在15%以下的建议,对于高温、高含冰量、地质条件复杂地区,路基填料粉黏粒含量应控制在12%以下。
After the freeze-thaw cycle of the coarse grained soil subgrade filler, the problem of frost heaving and densification will be reduced, which will affect the stability of the subgrade. In order to study the problem of the decrease of the compaction degree of the coarse grained soil subgrade filling after the freeze-thaw cycle in the permafrost region, The freeze-thaw cycles of coarse grained soil samples with different clay content and moisture content were used to analyze the decay law of the modulus of elasticity of the coarse grained soil to study the freeze-thaw resistance of coarse grained soil. The test results show that the content of powder and clay, moisture content and the number of freeze-thaw cycles are all the factors affecting the anti-freeze-thaw properties of coarse-grained soil. Based on this, it is suggested that the clay content of subgrade filler powder be controlled below 15% in the permafrost regions. For high temperature, high ice content and complex geological conditions, the clay particle content should be controlled below 12%.