浦南高速公路马踏岭两桥梁改路基优化设计

On the Optimized Design for the Transformation of Two Bridges into the Subgrade at Mataling Hill of the Pu′nan Expressway

根据浦南高速公路马踏岭2、3号大桥工程特点,通过水文、地质调查和环境评价以及质量、安全、工期、效益等诸多方面分析,采取凿洞截流疏导、引溪流离开线路路基和设涵保灌、解决民众通行及填石筑路确保路基质量稳定等措施,使桥梁改路基获得成功。经济与社会效益显著,为设计施工提供了可供借鉴的经验。

With the engineering characteristics of No. 2 and No. 3 Mata Hill bridges of the Pu-Nan Expressway taken into ac- count, and upon the basis of the analyses of the hydrological and geological conditions of the site, the evaluation of the environ- ment and the evaluation of quality, safety, construction duration, benefits and other aspects, the technical quality-stabilizing measures of digging caves to intercept or drain river water,leading streams away from the subgrade of the railway, building culverts to ensure irrigation, helping the public to solve their traffic difficulties, using stone to build roads, etc. are adopted to ensure the stability and good quality of the subgrade. With all the above-mentioned measures taken, the transformation of the two bridges into the subgrade is proved to be a great success, with obvious economic and social benefits achieved. The success of the transformation project may provide useful experience for the design and construction of other similar projects.