【摘要】 以浦东机场四跑道深厚软弱土层为研究对象,进行堆载预压试验,对插设塑料排水板与不插设塑料排水板2种条件下地基土层的沉降变形规律进行对比研究。研究发现,堆载预压期间插板区原地面的沉降速率及沉降量均远远大于不插板区,2个区域加载期间的瞬时沉降量均较大,且均大于堆载期间总沉降量的50%;分层沉降观测结果显示,在超载预压过程中,相对于实际工程荷载,地基土层会出现浅部超固结而深部仍处于欠固结并存的状态,因此,对于深厚多层软弱土地基,堆载卸除后的剩余沉降应分层分别计算。研究结果对类似软弱土地基处理工程的设计及施工具有重要的参考意义。更多还原

【Abstract】 The deep soft soil layer of the 4th runway at Pudong Airport was studied in this paper.During preloading test,the ground settlement deformation law was analyzed and compared under two conditions,using plastic drain plate or without.It was found that during preloading,both the ground settlement and settlement rate in areas using plastic drain plate were much larger than those areas without plastic drain plate.The instantaneous settlement during preloading was both large in two conditions,which both exceeded 50% of the total settlement during whole preloading process.During the process of surcharge preloading,compared to actual loading,the state of the ground soil would appear that shallow soil was over consolidation while the deep soil was still under consolidation.Therefore,for deep multi-layer soft soil ground,residual settlement should be calculated layered and separately after unloading.The research results would have important reference significance to the design and construction of soft soil foundation treatment project.更多还原