水平排水板真空预压法处理吹填流泥试验研究

Experimental study on dredger fill flow mud improved by vacuum preloading method employing horizontal drains

常规的竖向排水板真空预压处理新近吹填流泥的压缩量可达30%～40%,呈明显的大变形特征,排水板弯曲变形严重,导致排水板中的真空度沿深度衰减较大,影响最终加固效果。针对吹填流泥的这种工程特性,通过对比试验,研究了水平排水板真空预压法在该类场地的应用。试验结果表明,水平板真空预压取得的沉降变形、孔隙水压力、出水量、含水率、十字板抗剪强度等物理力学指标均好于常规的竖向板真空预压,并分析了水平板真空预压处理吹填流泥的优势。结果表明,水平板真空预压是一种可行的吹填流泥处理方法。

The vertical drainage plate is normally applied in vacuum preloading method for the treatment of blown filled mud and the volume compaction ratio can be as high as 30%- 40%. However, the drainage plate has serious deformations in this approach.This leads to the fact that vacuum degree in the drainage plate significantly decreases with the increase of depth. In this study, contrast tests were conducted to investigate the application of horizontal drainage plate in vacuum preloading method. The results show that physical and mechanical properties （e. g., settlement deformation, pore water pressure variation, water drainage amount, water content, vane shear strength, etc. ） obtained by horizontal drainage plate are better performed than those by applying the vertical drainage plate.In addition, the advantages of employing horizontal drainage plate to blown filled mud treatment are analyzed.It is feasible to apply vacuum preloading method to blown filled mud with the horizontal drainage plate.