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摘要:
海底淤泥具有特殊的土性特点，其固化研究尚处于起步阶段。GS固化剂是一种以工业固废为主要原料的适用于软土加固的绿色固化材料。本文开展了GS固化剂加固海底淤泥的应用研究。以香港某工程海底淤泥为加固对象，对比分析了GS固化剂和水泥的掺量、龄期对固化土无侧限抗压强度的影响。研究结果表明，相比于普通水泥，GS固化土的早期强度更高、强度增长更快，强度提高比在2.03~2.91。同时，建立了回归模型，提出了GS固化剂加固海底淤泥的强度预测方法。研究成果有助于指导工业固废的资源化处置和建筑行业绿色发展。
Abstract:Due to the special soil properties of submarine silt, studies of its stabilization are still in its infancy. GS (Gypsum-Slag) agent is a novel green agent for stabilizing soft soil, which is produced mainly based on industrial solid wastes. This paper presents an application study of GS agent for stabilizing submarine silt. The submarine silt was sampled from a certain project in Hongkong. Unconfined compressive test is conducted to investigate the influence of binder content and curing age on the stabilized soil by GS agent and ordinary cement. The results show that as compared with ordinary cement, the GS agent stabilized soil has higher early strength and faster growth rate, with a strength improvement ratio ranging from 2.03 to 2.91. The regression model is established and the strength prediction method of submarine silt stablized by GS agent is proposed. The research results are beneficial to guide the resource utilization of industrial solid waste and green development of construction industry.
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表 1 海底淤泥土性指标
Table 1. Soil properties of submarine soft soil
项目 参数 含水率/% 44.3 天然重度/(kN·m−3) 17.9 孔隙比 1.086 液限/% 44.5 塑限/% 25.1 压缩模量/MPa 2.3 黏聚力/kPa 9.6 内摩擦角/(°) 11.2 渗透系数/(10−7 cm·s−1) 0.891 有机质质量分数/% 2.0 硫酸盐质量分数/% 0.06 水溶性硫酸盐质量分数/% 0.17 水溶性氯化物质量分数/% 0.42 pH值 7.6 碳酸盐质量分数/% 1.33 
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表 2 GS固化剂与水泥性能指标
Table 2. Performance indices of GS agent and cement
项目 GS固化剂 水泥 0.8 mm筛余量/% 1.2% − 细度/% − 1.25 初凝时间 04:34 02:10 终凝时间 06:36 03:10 安定性 合格 合格 标准稠度/% 25.8 − 相对密度/% 2.99 − 比表面积/(m2·kg−1) 489 − SO2/% − 2.25 烧失量/% − 1.07 MgO/% − 2.27 抗压强度/MPa 3 d: 22.7
28 d: 41.23 d: 26.7
28 d: 48.9
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表 3 无侧限抗压强度提高比
Table 3. Improvement ratio of the unconfined compressive strength
龄期/d 掺量/% 10 15 20 14 2.47 2.71 2.81 28 2.91 2.78 2.18 56 2.17 2.03 2.38 90 2.71 1.97 2.14
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