无砂垫层真空预压在吹填淤泥场地河道边坡加固中的应用

Application of Non-Sand-Cushion Vacuum Preloading in Reinforcing Waterway Slope in Dredger-Fill Silt Yard

无砂垫层真空预压法作为一种改进工艺,具有工序简单、无需砂石料等优点,在河道边坡加固具有良好的效果。本文通过台州东部新区吹填淤泥场地开挖河道案例,分析真空预压加固土体强度增长计算,并与实际加固效果对比,对比结果表明处理效果达到设计预期目标;分析卸荷对土体强度指标影响,建议选取河道开挖稳定性计算参数时应考虑卸荷影响,使其更接近实际状态;采用PLAXIS有限元软件对无砂垫层真空预压加固后场地开挖河道的稳定进行分析,分析结果表明可以满足岸坡稳定要求。

As an upgraded process,non-sand-cushion vacuum preloading method is of such advantages as simple process as well as no sand/gravel needed,and can be used to reinforce the waterway slope well.Based on the excavation of the waterway in a dredger-filled silt yard in the eastern new district of Taizhou,the calculation process of the soil strength growth through vacuum preloading was analyzed,and compared with the real reinforcing effect.The results showed that the treatment effect reached the expected design value.By analyzing the effect of load-relieving on the soil strength index,the effect of load-relieving shall act as one of factors for calculating the stability of waterway excavation,so that the result would be closer to the real situation.Finite element software PLAXIS was used to analyze the stability of the excavated waterway subject to the yard being reinforced by vacuum preloading without sand cushion.The analysis results verified the stability of bank slope.