怀芷高速公路红砂岩路基填料改良试验研究

Experimental Study on Filling Improvement for Red Sandstone Subgrade along Huaihua-Zhijiang Expressway

通过对红砂岩矿物成分分析、土工试验、崩解及CBR试验,结合怀芷高速公路红砂岩路基填筑,发现红砂岩若直接填筑路基,会造成路基不均匀沉陷或塌方。为消除红砂岩作为路基填料的不良特性,采用水泥和石灰分别作为改良剂对红砂岩风化产物进行改良试验。结果表明:掺入4%的水泥可使红砂岩路基的强度达到要求。

In relation to the subgrade filling by red sandstone along Huaihua-Zhijiang Expressway,it was found through mineral composition analysis of red sandstone,geotechnical test,and disintegration and CBR tests that direct filling of red sandstone may lead to uneven subgrade settlement or collapse.In order to eliminate the undesirable properties of red sandstone as subgrade filler,cement and lime were used as the modifiers to conduct the test on the weathering product of red sandstone.The result shows that,with 4%cement mixed,the strength of red sandstone subgrade may reach the requirement.