沿海滩涂地区软基复合式处治方法加固机理及效果评价

Reinforcement Mechanism and Effect Evaluation of Soft Foundation Compound Treatment Method in Coastal Beach Area

软基是沿海滩涂地区施工中常见的地质现象,如果处置不好会对道路工程产生巨大的危害。文章提出了一种新的软基复合式治理方法:对软基进行部分换填粗砂和碎石,再采用土工格栅对路基进行加固。同时对其进行了应用效果评价。研究结果表明:复合式处治方法采用水稳定性好、弹性模量大的密实砂垫层或碎石垫层代替软弱土层,形成良好的人工地基,大大提高了地基的承载能力和稳定性;复合式处治方法施工,不需要特殊施工机械,受各种制约因素少,可大大节约工期和降低施工成本,可在类似工程实践中推广应用。

Soft foundation is a common geological phenomenon in the construction of coastal beach ar- eas,and its wrong disposal will cause great damage to road works.This article proposed a new soft foundation compound treatment method：the soft foundation is partly replaced with coarse sand and gravel,and then the roadbed is reinforced by geogrid.At the same time, it evaluated its application effect.The results showed that the compound treatment method adopts the dense sand cushion-layer or gravel cushion-layer with good water stability and elastic modulus to replace the soft soil layer, forming a good artificial foundation,which can greatly improve the bearing capacity and stability of the foundation;the construction by compound treatment method does not need special construction ma- chinery,with few constraints,thus it can greatly save construction time and reduce construction costs, which can be applied in similar engineering practice.