山区高速公路旧路拓宽改建后,在新旧路基衔接位置处容易产生纵向裂缝,其主要原因是由于新旧路基不均匀沉降引起的路面结构层内附加应力超过了材料的抗拉强度或界面强度。文章依托实际工程通过对实际路基的改扩建方式进行数值计算及现场实测结果的对比分析,研究结果表明采用土工格室柔性搭板技术处治山区高速公路的旧路基加宽是合理可行的。 The main reason for the longitudinal cracks in the junction of old and new subgrade is that the additional stress in the pavement structure layer due to the uneven settlement of old and new subgrade exceeds the tensile strength or interfacial strength of the material. The article relies on the actual project through the numerical calculation of the actual expansion and reconstruction of the roadbed and field comparison of the measured results, the results show that the use of geocell flexible boarding approach to the treatment of mountain highway in the old embankment widening is reasonable and feasible.