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旧路拓宽中新老路基沉降量不一,必然产生一定的沉降差异,这种差异沉降在高路堤中更加突出。采用土工格栅对旧路拓宽中的路基不均匀沉降进行加固处理是常用的措施。文章以沪蓉西高速公路贺家坪连接线老路拓宽高路堤实际工程为依托,选择典型断面,建立力学模型,应用GeoStudio2004中SIGMA/W模块对加固前后路基整体的力学响应特性进行仿真分析,重点分析了土工格栅对路基整体受力变形特性的影响,并就实际施工提出一些建议。
The old road broadening new and old subgrade settlement varies, inevitably have some differences in settlement, this difference in settlement is more prominent in high embankment. It is a common practice to use geogrids to reinforce uneven subgrade settlement in the old roads. Based on the actual project of widening high embankment of old road in Hejiaping expressway of Shanghai-Chengdu-West Expressway, a typical section is selected and a mechanical model is established. The mechanical response characteristics of the whole roadbed before and after reinforcement are simulated by using SIGMA / W module in GeoStudio2004. The influence of geogrid on the overall deformation of subgrade is analyzed. Some suggestions are put forward for practical construction.