淤泥质袋装土挡墙技术研究和应用分析

Research and Application Analysis of Bagged Silt Retaining Wall Technology

长江三角洲地区土层主要为海陆交互沉积形成的淤泥或淤泥质土,属于软弱土层,工程性能较差,工程建设中常严禁将其用于结构物回填。因此,在缺乏优质土源的长江三角洲地区,要进行工程结构物墙后回填,往往需要购置优质土,工程造价高,经济效益差。结合杨林塘航道整治工程,对淤泥质袋装土挡墙进行了系统研究;通过优化挡墙结构设计和利用土工织物改良墙后淤泥土,构建了良好稳定的河道防护结构。工程实践表明,现浇扶壁式挡墙结合袋装淤泥土墙后回填结构在类似的工程地质条件下,稳定性好,外形美观,造价低,经济效益好,对淤泥质土分布较广的长江流域和沿海地区的防护施工具有较高的参考价值。

The soil layer in the Yangtze River Delta region is mainly composed of silt or muddy soil deposited by the interaction between sea and land,which belongs to weak soil layers and has poor engineering performance,and it is often prohibited to be used for structural backfilling in engineering construction.Therefore,in the Yangtze River Delta region where high-quality soil sources are scarce,it is often necessary to purchase high-quality soil for backfilling behind the walls of engineer-ing structures,resulting in high engineering costs and poor economic benefits.A systematic study was conducted on the bagged silt soil retaining wall in conjunction with the Yanglintang waterway regulation project,by optimizing the design of the retaining wall structure and improving the silt behind the wall with geotextile,a good and stable river protection structure has been constructed.Engineering practice has shown that the combination of cast-in-place buttress retaining walls and bagged silt soil walls for backfilling has good structural stability,pleasing appearance,low cost,and high economic benefits under similar engineering geological conditions,and has high reference for the protective construction of the Yangtze River Ba-sin and coastal areas with a wide distribution of muddy soil.