薛兴龙

为分析岩溶区高速公路填方路基施工期沉降规律及稳定性，选取某岩溶路基段14个监测断面、28个测点开展连续沉降观测，并对不同监测时段、断面及左右幅沉降特征进行分析，结合指数渐近模型进行沉降预测。结果表明：路基沉降总体呈“前期较快、中期减缓、后期趋稳”的阶段性特征，最终平均累计沉降约为5.18 mm，最大累计沉降为10 mm；不同断面及左右幅之间存在一定差异，右幅平均沉降总体高于左幅；随着施工推进，沉降速率持续降低，后期未见明显新增沉降。指数模型能够较好反映实测沉降的渐近变化趋势。综合分析表明，研究路段施工期沉降总体趋于稳定，但局部沉降较大及差异明显断面仍需加强动态监测。

岩溶区；高速公路；路基工程；施工期沉降；监测分析；沉降预测

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