低强度桩复合地基在机场道面沉陷病害修复中的应用研究

Application Research of Composite Foundation with Low Strength Pile in the Repair of Airport Pavement Subsidence Disease

摘要: 低强度桩复合地基技术具有处理深度范围大、承载力提高幅度大、地基变形小的优点，但存在相对工期长、经济性较差的缺点，在西北地区大面积道面地基处理中应用较少。本文结合某机场隔离机坪道面沉陷病害的道面检测、土基勘察，对沉陷病害原因进行了详细分析；结合低强度桩复合地基技术的特点，对其适用性、设计参数选取、施工工艺控制进行了探讨；最后根据现场监测数据，对低强度桩复合地基在道面沉陷病害修复中的应用效果进行了评价，并对该复合地基技术应用应注意的问题进行了分析与思考。

Abstract: Composite foundation with low strength pile technology is rarely used in large-area pavement foundation treatment in Northwest China. It has the advantages of large range of treatment depth, large increase of bearing capacity and small foundation deformation. However, it has the disadvantages of relatively long construction period and poor economy. Based on the pavement inspection and soil foundation investigation of the pavement subsidence disease of an airport isolation apron, the causes of the subsidence disease are analysed in detail; combined with the characteristics of composite foundation with low strength pile technology, its applicability, selection of design parameters and construction process control are discussed; finally, the application effect of composite foundation with low strength pile technology in the repair of pavement subsidence diseases is evaluated according to the monitoring data. Some analysis and thinking on the issues concerning in the application of this technology are proposed.