东北大学学报(自然科学版) ›› 2025, Vol. 46 ›› Issue (4): 106-114.DOI: 10.12068/j.issn.1005-3026.2025.20230273
• 资源与土木工程 • 上一篇
李猛1, 赵文1, 王鑫1, 刘晓迪2
收稿日期:
2023-09-25
出版日期:
2025-04-15
发布日期:
2025-07-01
作者简介:
李 猛(1998—),男,辽宁葫芦岛人,东北大学硕士研究生Meng LI1, Wen ZHAO1, Xin WANG1, Xiao-di LIU2
Received:
2023-09-25
Online:
2025-04-15
Published:
2025-07-01
摘要:
在黏土地层中掘进时,盾构会遇到刀盘“结泥饼”、土仓积土、排土不畅等问题.为此,依托沈阳地铁六号线文储路站—观音路站区间盾构项目,基于泡沫发泡倍率及半衰期试验、分散剂沉降试验、旋转剪切试验、流动度试验、搅拌试验进行渣土改良,并使用扫描电镜、Zeta电位及双电层理论对分散剂改良黏土的机理进行了分析. 研究表明:当泡沫剂体积分数为4%、六偏磷酸钠质量分数为2%时,改良剂性能较好;在含水率为30%的土体中,分散剂注入比为10%、泡沫注入比为30%~60%时,改良效果较好;扫描电镜及Zeta电位试验显示,质量分数为2%的六偏磷酸钠溶液能增加黏土双电层厚度,起分散黏土的作用.
中图分类号:
李猛, 赵文, 王鑫, 刘晓迪. 黏土地层土压平衡盾构渣土改良试验研究[J]. 东北大学学报(自然科学版), 2025, 46(4): 106-114.
Meng LI, Wen ZHAO, Xin WANG, Xiao-di LIU. Experimental Study on Muck Improvement of Clay Stratum in Earth Pressure Balance Shield[J]. Journal of Northeastern University(Natural Science), 2025, 46(4): 106-114.
参数 | 试验方法 | 值 |
---|---|---|
含水率/% | 烘干法 | 25 |
塑限/% | 液塑限联合测定法 | 23.11 |
液限/% | 液塑限联合测定法 | 42.3 |
塑性指数 | 液塑限联合测定法 | 19.19 |
内摩擦角/(°) | 直剪试验 | 12.7 |
黏聚力/kPa | 直剪试验 | 31.6 |
压缩模量/MPa | 压缩试验 | 6.84 |
表1 土层物理参数
Table 1 Physical parameters of soil layer
参数 | 试验方法 | 值 |
---|---|---|
含水率/% | 烘干法 | 25 |
塑限/% | 液塑限联合测定法 | 23.11 |
液限/% | 液塑限联合测定法 | 42.3 |
塑性指数 | 液塑限联合测定法 | 19.19 |
内摩擦角/(°) | 直剪试验 | 12.7 |
黏聚力/kPa | 直剪试验 | 31.6 |
压缩模量/MPa | 压缩试验 | 6.84 |
序号 | 改良剂名称 | 含水率 | 注入比 |
---|---|---|---|
1 | 水 | 20 | 0,5,10,15,20,25 |
2 | 泡沫 | 20,25,30 | 15,30,45,60 |
3 | 分散剂 | 20,25,30 | 5,10,15,20 |
4 | 组合改良剂 | 30 | 泡沫:15,30,45,60 |
30 | 分散剂:5,10,15,20 |
表2 改良剂注入比范围 (%)
Table 2 Range of improver injection ratio
序号 | 改良剂名称 | 含水率 | 注入比 |
---|---|---|---|
1 | 水 | 20 | 0,5,10,15,20,25 |
2 | 泡沫 | 20,25,30 | 15,30,45,60 |
3 | 分散剂 | 20,25,30 | 5,10,15,20 |
4 | 组合改良剂 | 30 | 泡沫:15,30,45,60 |
30 | 分散剂:5,10,15,20 |
六偏磷酸钠溶液添加比/% | 加入水质量/g |
---|---|
0 | 1 000 |
2 | 998 |
4 | 996 |
6 | 994 |
8 | 992 |
10 | 990 |
表3 测定Zeta电位时各成分添加量 (the determination of Zeta potential)
Table 3 Amount of each component added during
六偏磷酸钠溶液添加比/% | 加入水质量/g |
---|---|
0 | 1 000 |
2 | 998 |
4 | 996 |
6 | 994 |
8 | 992 |
10 | 990 |
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