摘要
介绍了我国公路改扩建工程的发展现状及技术难点,然后对山西某公路改扩建工程采用土工格栅固定、块石锁嵌以及喷射砂浆加固的方法增强粘结力以及路基整体性,从而保证压实效果;再利用厂拌冷再生铺筑新老路基共同作用层,分散传递荷载应力。最后用灌砂法测定新老路基压实度;贝克曼梁法检测弯沉来评价路基稳定性。结果表明,这种技术处理后的路基衔接紧密,同一横截面新老路基压实度差值均小于1%,弯沉相差小,路基整体性良好。
The paper firstly introduced the present situation of reconstruction and extension engineering in our country and the technical difficulties, Then it took the reconstruction and extension engineering in Shanxi province for example to introduce the technology which used geogrid, rubble and injection mortar to enhance the cohesive force and the integrity to ensure the roadbed compaction effect. Then the paper used the plant -mixed cold regeneration as common function layer of the new and old subgrade to transfer the load stress. Finally, it used the sand replacement method to detect the compaction degree, and used the Beckman Beam Method to detect the flexure to evaluate the stability of subgrade. The results that the new subgrade which has used this technology can link closely to the old subgrade . The compaction degree difference at the same cross section of the new and old subgrade is less than 1%. The deflection difference is small, and the overall stability is acceptable.
关键词
改扩建工程
冷再生
路基
衔接
renovation and expansion engineering
cold regeneration
subgrade
splicing
