Abstract

An improved method, i.e., flocculation–solidification combined method (FSCM), has been developed for building a working platform more efficiently at the surface of newly reclaimed ground filled with hydraulically dredged mud slurry at extra high water content (EHW-MS). Previous experimental results have demonstrated the significant superiority of FSCM over conventional pure cement solidification method (PCSM) under some application conditions. This study focuses on further clarifying the reasonable boundary for the application conditions, i.e., identifying the reasonable application range, of FSCM in EHW-MS treatment. A number of laboratory experiments are performed to characterize the deposition and strength gain behavior of FSCM or PCSM treated EHW-MS samples with various values of the equivalent initial water content (w_ei) and Atterberg limits. The deposition and strength characteristics resulting from FSCM and PCSM are then compared comprehensively to illustrate the influence of w_ei and Atterberg limits on the superiority of FSCM over PCSM. Results indicate well that FSCM shows more significant superiority over PCSM with the increase of either w_ei or Atterberg limits, and plastic limit > 14 (or liquid limit > 23) and w_ei > 232% can be considered as the reasonable application range of FSCM in EHW-MS treatment, within which the solidification efficiency of FSCM is at least 1.20 times higher than that of PCSM.

摘要

开发了一种改进的方法，即絮凝-固化联合方法 ( FSCM ) ，用于在超高水位填充水力疏浚泥浆的新开垦地表更有效地建造工作平台。水含量 ( EHW-MS )。以往的实验结果已经证明FSCM相对于传统的纯水泥固化方法（PCSM) 在某些应用条件下。本研究的重点是进一步明确FSCM在EHW-MS处理中应用条件的合理边界，即确定FSCM的合理应用范围。进行了许多实验室实验来表征FSCM或PCSM处理的 EHW-MS样品的沉积和强度增益行为，这些样品具有不同的等效初始含水量 ( w _ei ) 值和 Atterberg 限制。然后综合比较FSCM和PCSM产生的沉积和强度特性，以说明w _ei的影响和 Atterberg 限制了FSCM优于PCSM的优势。结果很好地表明，随着w _ei或 Atterberg 极限的增加， FSCM比PCSM表现出更显着的优势，塑性极限 > 14（或液限 > 23）和w _ei > 232% 可以被认为是FSCM的合理应用范围在EHW-MS处理中，FSCM的凝固效率至少比PCSM高 1.20 倍。