真空预压法处理滩面淤泥层试验研究

以上海浦东国际机场四期扩建工程试验段为依托，对其新老大堤之间区域地基真空预压法处理后地层的沉降变形、侧向变形和水土压力等开展现场监测，分析相关监测数据，得到新老大堤之间区域地基变形特性。研究发现:真空预压区地表沉降与地基内部各层土体随时间发展规律基本相同，沉降主要为中部层组的滩面淤泥层达30.0 cm，原地表最大沉降量达101.5 cm，地基处理竖向影响深度在排水板以下地层影响微弱，其水平影响范围较大，在25 m范围外仍存在影响。

Experimental Study on the Treatment of Beach Silt Layer by Vacuum Preloading Method

Based on the experimental section of the fourth phase expansion project of Shanghai Pudong International Airport, the settlement deformation, lateral deformation and soil and water pressure of the ground between the old and new levees were monitored on site by vacuum preloading method, and the related monitoring data were analyzed to obtain the deformation characteristics of the foundation between the new and old levees. The research found that the surface settlement in the vacuum preloading area has the same development law with time as the soil in each layer inside the foundation. The sedimentation is mainly for the beach silt layer of the middle strata up to 30.0 cm and the maximum settlement of the original surface is 101.5 cm. The vertical influence depth of foundation treatment is weak in the stratum below the drainage plate, but its horizontal influence range is large, and it still has influence beyond the range of 25 m.