透水性混凝土桩在桥头跳车处治中的适用性研究

Research on suitability of permeable concrete pile for solving problem of jumping at bridge end

桥头跳车现象作为高速铁路、公路建设的质量通病,严重影响了行车的舒适性和安全性。为降低桥头跳车的危害,本文结合正在施工的济(南)东(营)高速公路,对透水性混凝土桩在桥头跳车处治中的适用性进行了研究。结果表明:透水性混凝土桩单桩承载力高、透水性强,有利于压缩层在施工期的排水固结,可有效减小软土地基的工后沉降量,对于处治8 m以下路基填高的小桥涵及桥头地基效果明显。研究结果为黄泛平原区透水性混凝土桩处治桥头跳车问题提供了理论依据。

Vehicle bumping at bridge end was among common defects of high-speed railway and expressway,affecting the comfort and safety.In order to solve this problem,the application of permeable concrete pile to improve vehicle bumping at bridge end was studied based on Jinan-Dongying Expressway,which was under construction.The results showed that permeable concrete pile had large bearing capacity of single pile and strong permeability,helping the drainage consolidation of the compression layer during construction and the reduce of the settlement after construction of soft soil foundation.In particular,the permeable concrete pile improves the jumping significantly when applied in small-span bridges/culverts in 8 m embankment.It can be applied in Yellow River flood plain.