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依托宁常高速公路常州段JT1施工标段穿越膨胀泥岩区域的工程实践,采用室内常规试样,就膨胀泥岩填料基本特性、无机结合料改良膨胀泥岩填料加固规律进行了研究,文章提出了石灰5%+粉煤灰15%改良效果最佳的结论。同时,通过对高速公路膨胀泥岩基底超挖换填机理分析,提出膨胀泥岩基底超挖换填厚度宜超过150cm,且采用一定厚度密闭型无机结合料改良土填筑膨胀岩基底表层更加合理的结论。
Relying on the engineering practice of JT1 construction section of Changzhou section of Ning-Chang Freeway across the expansive mudstone area, the conventional indoor samples were used to study the basic characteristics of expansive mudstone filler and inorganic filler to improve the law of expansive mudstone filler reinforcement. % + 15% improvement of fly ash The best conclusion. At the same time, through the analysis of over-excavation replacement mechanism of expansive mudstone basement in expressway, it is suggested that the over-fill thickness of expansive mudstone base should be over 150cm, and it is more reasonable to use airtight inorganic binder to modify the surface of expansive rock basement. .