冲击荷载下塑料排水板间距对超软土地基固结效果的影响

Influence of Distance of Plastic Drainage Plate on Consolidation Effect of Ultra-soft Soil Foundation Under Impact Load

对静动力排水固结法加固超软土地基而言,塑料排水板布置方式、间距、插入深度及其井阻与涂抹作用等都直接影响着加固效果。以广州某化工品仓储区工程为例,分析了冲击荷载下塑料排水板间距对超软土地基固结效果的影响,结果表明:在同种塑料排水板布置方式和相同插板深度下,不同排水板间距,固结效果不一样;在不存在底部透水层的条件下,排水板的间距越小,加固效果越好;冲击荷载作用后孔隙水压力逐渐消散,土压力和沉降量得以持续增长。此外,在反映静动力排水固结法中动力荷载、静力和排水体系相互之间的适应关系基础上,建立了冲击荷载作用下淤泥地基排水板间距L的定量模型,为一般的工程人员做设计应用提供了方便,对类似的软土地基处理工程有借鉴或指导意义。

The static and dynamic drainage consolidation method has been utilized for ultra-soft foundation reinforcement, many factors could affect its reinforcement effect. Took a storage project in Guangzhou as an example, this research analyzed the spacing of plastic drainage plate under the shock load of super soft soil consolidation effect, the results showed that under the condition of the same arrangement and insertion depth, different spacing of plastic drainage plate result in different reinforcement effect; if there is no permeable layer at the bottom, the smaller drainage spacing is the better rein- forcement effect will be; There is sustaining residual force after applying impact load, a sustained growth of soil pressure and settlement generates. Upon the relationship of mutual adaptation among the static load, impact load and drainage system, the quantitative model of drainage spacing L of ultra-soft soil foundation under the impact load was built in this paper. The quantitative expression also provides a convenient way to the design and application of general engineering, and there are references and guidance for similar soft ground treatment works.