强夯置换法加固公路盐渍化软土路基

Salinized Soft Soil Subgrade Reinforced by Forced Tamping Replacement

国道314线焉耆段广泛分布着盐渍化软土，存在路基沉陷、翻浆及路面破坏等多种病害，须加固治理。在分析盐渍化软土工程特性和强夯置换法加固软土路基机理的基础上，首次选用强夯置换法加固本路段盐渍化软土路基，并介绍了强夯置换法的设计、施工及检测方法。现场载荷试验、重型动力触探试验和面波检测结果表明强夯置换法加固盐渍化软土路基后，地基土承载力均在250-300kPa以上，地基土达到了密实-中密状态，加固效果良好。

Salinized soft soil is wildly distributed in National Highway NO. 314 which must be treated because of the harmful caused by salinized soft soil such as subgrade settlement, frost boiling and pavement damage. Based on the analyse of salinized soft soil＇s engineering characteristics and the mechanic of forced tamping replacement, forced tamping replacement is firstly used to reinforced in this highway. The design, construction and detection of this method are introduced. The result of loading test in site and heavy dynamic penetration test indicate that the foundation soil can reach dense-medium dense state and the soil＇s bearing capacity is increased.