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孔令宜1 ,  祁雄贵2 ,  朱福强1  ,  李因璐2 ,  孟丽君2 ,  朱永阳3

 

( 1 .  中建筑港集团有限公司 ，青岛 266011 ;  2.  泰安市交通运输局港航铁路机场服务中心 ，泰安 271000 ;

3 .  河海大学 岩土工程研究所 ，南京 210098)

摘   要 ：通过无侧限抗压强度试验 ，分析初始含水率 、水泥掺量 、粉煤灰掺量及养护龄期对淤泥固化土静力特性的影响。结果表明： 固化土强度随初始含水率升高而降低 ，50% 、60% 、70% 含水率下满足铁路基床表层强度标准  (500 kPa)   的最低水泥掺量分别为 6% 、8% 、10% ；水泥掺量与强度呈线性增长关系 ，拟合得到三种含水率下强度为零时的水泥掺量分别为 1 . 28% 、2. 24% 、3 . 31% ；粉煤灰对强度的影响因含水率而异 ，50% 含水率下强度随粉煤灰掺量增加而降低 ，60% 和 70% 含水率下强度先增后减或逐步提升 ；固化土 28 d 龄期内强度随养护时间增长而提高，7 ~ 14 d 的增长速率高于 14 ~ 28 d。研究明确了多因素影响下的淤泥固化土强度变化规律 ，为疏浚淤泥资源化利用提供了配比依据。

关键词：淤泥固化土 ；水泥 ；粉煤灰 ；静力特性 ；峰值强度

中图分类号：TU447           

文献标志码：A           

文章编号： 1005- 8249   (2025)  04- 0074- 07

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .04.014

 

KONG Lingyi 1  ,   QI Xionggui2 ,  ZHU Fuqiang1  ,  LI Yinlu2 ,  MENG Lijun2 ,  ZHU Yongyang3

（ 1 . China Construction Port Construction Group Co . ,  Ltd. ,  Qingdao 266011 ,  China;

2. Tai ’an City Transport Bureau Port Aviation Railway Airport Service Center , Tai ’an 271000 ,  China;

3 . Geotechnical Research Institute of Hohai University , Nanjing 210098 ,  China)

Abstract : This study investigated the effects of initial water content ,  cement dosage ,  fly ash content ,  and curing age on the static characteristics of silt solidified soil through unconfined compressive strength tests .  The results indicated that the strength of the solidified soil decreased with increasing initial water content.  The minimum cement dosages required to meet the strength criterion for railway subgrade surface layers (500 kPa) were 6% ,  8% ,  and 10% at initial water contents of 50% ,  60% ,  and 70% ,  respectively.  A linear relationship was observed between cement dosage and strength ,  with extrapolated zero - strength cement thresholds of 1 . 28% ,  2. 24% ,  and 3 . 31%  for the three water content levels .  The influence of fly ash on strength exhibited water content dependency :  strength decreased with fly ash addition at 50% water content ,  showed an initial increase followed by reduction at 60% water content ,  and demonstrated progressive enhancement at 70%  water content.  The strength increased throughout the 28 - day curing period ,  with higher growth rates observed during the 7 - 14 days phase compared to the 14 - 28 days phase .  These findings elucidate the coupled effects of multiple factors on strength evolution and provide practical mix proportion guidelines for the resource utilization of dredged silt.

Key words : silt solidified soil; cement; fly ash; static characteristics; peak strength

作者简介：孔令宜  (1992—) ,  男 ，本科 ，工程师 ，研究方向：地基处理。

通信作者：朱永阳  (1996—) ,  男 ，博士研究生 ，研究方向：软土地基处理。

收稿日期：2023 - 10 - 19