滨海地区高水位砂土路基施工技术及质量控制研究

Research on Construction Technology and Quality Control of High Water Level Sand Subgrade in Coastal Area

砂土是一种常见的路基回填材料,浸水后其土体抗剪强度发生较大变化,易发生塌陷、溜塌等病害,实际施工中往往忽视对积水的处理,而我国滨海地区砂土含量丰富,降雨量大、地下水位高,易产生各类砂土路基病害。本文依托某工程实例,分析了砂土路基常见的病害形式及产生原因,提出了提高施工质量的技术方案,对施工质量和工后长期沉降进行了检测和监测,并与某临江未采取相应防水降水措施路段进行分析对比,结果显示,通过对回填材料的优化和施工工艺的改进,可有效减少360d累计沉降35%。

Sand is a common subgrade backfill material.After being immersed in water,the shear strength of the soil changes greatly,and it is prone to collapse and slippage.The actual construction often neglects the treatment of stagnant water.However,the sandy soil in coastal areas of our country is rich in content,rainfall is heavy,and groundwater level is high,so it is easy to lead to various sand roadbed diseases.Relying on an engineering example,this paper analyzes the common disease forms and causes of sandy soil roadbeds,proposes technical solutions to improve construction quality,detects and monitors construction quality and long-term settlement after construction,and comparison was carried out with certain road section closed by a river which does not take the corresponding waterproof and precipitation measures.The analysis and comparison of the road sections with waterproof and precipitation measures show that the optimization of backfill materials and the improvement of construction technology can effectively reduce the cumulative settlement by 34%in 360 days.