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含砂低液限粉土的路用性能较差,通常不用作高速公路路基填料。云南省新河高速公路沿线广泛分布该类土体,其含水量较高,常规施工难以压实。从技术上讲,对其可用良性土换填、土体改良等方法进行处理,但由于路线附近缺乏良性土料和石料,换填和改良不仅会大幅提高工程造价,同时不利于环境保护。通过改变施工工艺的方法,提高含砂低液限粉土压实度,可以使其满足规范要求。根据气候条件,土料含水量可在每年11月~次年4月间通过翻拌晾晒的方法降低;现场振动压实试验表明,当松铺土层厚度为30 cm、压实遍数不小于5遍时,只要控制好土料含水量的变化范围,压实度是可以确保的;冲击压实试验表明,冲压补强措施对提高压实度是有益的,当压实度不满足要求时可以考虑使用冲压补强。
Poor road performance with low liquid limit silt, usually not used as highway subgrade filler. This type of soil is widely distributed along the New River Expressway in Yunnan Province, and its water content is relatively high. Conventional construction is difficult to compaction. Technically, it can be used for benign soil replacement, soil improvement and other methods to deal with, but due to the lack of benign material and stone near the route, for filling and improvement will not only significantly improve the project cost, and is not conducive to environmental protection. By changing the method of construction technology to improve the compaction degree of silt with low liquid limit silt can make it meet the specification requirements. According to the climatic conditions, the moisture content of soil material can be reduced by means of overturning and drying in November to April next year. The on-site vibration compaction test shows that when the thickness of the soil layer is 30 cm and the compaction times are not less than 5 times, as long as the control of soil moisture content of the range, the degree of compaction can be ensured; impact compaction test shows that the stamping reinforcement measures to improve the degree of compaction is beneficial, when the compaction does not meet the requirements Can consider using stamping reinforcement.