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过大的路基差异沉降将导致路面破坏,严重影响行车安全。文中依托青岛市崂山路拓宽工程,将分布式光纤传感技术引入到路基稳定监测之中,提出传感光纤监测路基纵向开裂的方法。结果表明,直径5 mm传感光纤能够承受基层恶劣的施工环境以及碎石的咬合作用,能够用于监测基层的纵向开裂。基层横向应变随环境气温的升高逐渐减小,各断面横向应变总体比较平缓,没有产生明显的纵向开裂。目前该路段高陡拓宽路基是稳定的。
Excessive subgrade settlement will lead to roadbed damage, seriously affecting traffic safety. This paper relies on the extension project of Laoshan Road in Qingdao City, introduces distributed optical fiber sensing technology into the roadbed stability monitoring, and proposes the method of sensing optical fiber to detect the longitudinal cracking of subgrade. The results show that the 5 mm diameter sensing fiber can withstand the harsh construction environment of the grassroots and the bite of the gravel, which can be used to monitor the longitudinal cracking of the grassroots. The lateral strain at the grass-roots level gradually decreases with the increase of ambient temperature, and the lateral strain of each section is generally flat with no obvious longitudinal cracking. At present, the section of steep widening roadbed is stable.