公路路基不均匀沉降成因及施工控制措施

Causes of Uneven Settlement of Highway Subgrade and Construction Control Measures

摘要:

公路路基不均匀沉降易引发路面开裂、桥头跳车、结构错台等问题,直接影响行车安全与道路使用寿命。文章以四川南充某二级公路改扩建工程为依托,结合川中红层丘陵地质特征,从固结机理、压实差异、水土耦合、刚度突变四个方面解析不均匀沉降的形成机制,提出差异化地基处理、智能压实管控、立体排水防控、全周期监测预警等成套控制技术,经现场监测验证,管控效果显著。

Abstract:

Uneven settlement of highway subgrade can easily cause problems such as pavement cracking, bridge jumping, and structural misalignment, directly affecting driving safety and road service life. Based on the reconstruction and expansion project of a second-class highway in Nanchong, Sichuan, and in combination with the geological characteristics of the red bed hills in central Sichuan, this paper analyzes the formation mechanism of uneven settlement from four aspects: consolidation mechanism, compaction difference, water soil coupling, and stiffness mutation, and proposes a complete set of control technologies such as differential foundation treatment, intelligent compaction control, three-dimensional drainage prevention and control, and full cycle monitoring and early warning. Through on-site monitoring and verification, the control effect is remarkable.