高速公路拼宽路基差异沉降试验分析与沉降监测质量控制

Analysis of Differential Settlement Test and Quality Control of Settlement Monitoring for Widening Roadbeds on Highways

摘要: 高速公路改扩建工程中，新老路基拼宽段差异沉降引发的路面纵向开裂、错台、局部沉陷、基层纵向断裂、脱空、唧泥等病害，严重影响行车安全与舒适性。本文通过室内试验与现场监测相结合的方法，系统分析差异沉降产生机理，开展土工合成材料加固、地基处理优化、填料改良等关键技术试验，构建沉降监测质量控制体系。研究表明：采用聚酯经编土工格栅与水泥改良填料复合加固技术，可使差异沉降量降低50%以上；基于沉降预测模型的动态施工控制，能有效将工后沉降控制在规范允许范围内。本文成果为高速公路新老路基施工提供技术支撑，具有重要工程应用价值。

Abstract: In the renovation and expansion project of highways, the differential settlement of the widened sections of new and old roadbeds has caused longitudinal cracking, misalignment, local subsidence, longitudinal fracture of the base layer, void, mud pumping and other diseases, seriously affecting driving safety and comfort. This article combines indoor experiments with on-site monitoring to systematically analyze the mechanism of differential settlement, carry out key technical experiments such as geosynthetic material reinforcement, foundation treatment optimization, and filling material improvement, and construct a settlement monitoring quality control system. Research has shown that the use of polyester warp knitted geogrid and cement modified filler composite reinforcement technology can reduce differential settlement by more than 50%; The dynamic construction control based on settlement prediction model can effectively control the post construction settlement within the allowable range of the specifications. The results of this article provide technical support for the construction of new and old roadbeds on highways, and have important engineering application value.