在公路拓宽过程中,由于沉降、变形累积和稳定性的差异,在新旧路基之间产生差异沉降,进而会引起原有路基变形,新路基失稳,甚至出现路基拉裂和下沉坍塌病害。以某山区拓宽公路中一段病害路基为例,在调查其病害特征的基础上,分析其形成机理,提出防治方法。 During the process of road widening, due to the differences of settlement, deformation accumulation and stability, differential settlement between the old and new roadbed will lead to the deformation of the original roadbed, the instability of the new roadbed and even the failure of subgrade cracking and sinking. Take a mountainous area as an example to broaden the roadbed of a disease in the highway. Based on the investigation of its disease characteristics, the formation mechanism is analyzed and the prevention and cure methods are put forward.