基于超细材料的全风化花岗岩防渗注浆研究

李永丰; 高宇豪; 陈天乐; 钟聚光; 胡岳; 李建中

doi:10.19509/j.cnki.dzkq.tb20220298

基于超细材料的全风化花岗岩防渗注浆研究

doi: 10.19509/j.cnki.dzkq.tb20220298

李永丰^{1, 2a,},
高宇豪^3, ,,
陈天乐⁴,
钟聚光⁴,
胡岳⁴,
李建中^{2a, 2b}

1.
中国电建集团中南勘测设计研究院有限公司, 长沙 410014
2a.
中南大学地球科学与信息物理学院, 长沙 410083
2b.
中南大学有色金属成矿预测与地质环境监测教育部重点实验室, 长沙 410083
3.
重庆大学土木工程学院, 重庆 400045
4.
湖南平江抽水蓄能有限公司, 湖南岳阳 410400

基金项目:

国家自然科学基金项目 41572269

详细信息

作者简介:
李永丰, E-mail: 38853023@qq.com

通讯作者:
高宇豪, E-mail: yhgao437@163.com

中图分类号: TU472.6
计量
- 文章访问数: 422
- PDF下载量: 43
- 被引次数: 0
出版历程
- 收稿日期: 2022-06-20
- 录用日期: 2022-09-13
- 修回日期: 2022-09-08

Research on anti-seepage grouting in completely weathered granite based on superfine materials

LI Yongfeng^{1, 2a
,},
GAO Yuhao^{3
, ,},
CHEN Tianle⁴,
ZHONG Juguang⁴,
HU Yue⁴,
LI Jianzhong^{2a, 2b}

1.
Power China Zhongnan Engineering Corporation Limited, Changsha 410014, China
2a.
School of Geosciences and Information Physics, Central South University, Changsha 410083, China
2b.
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring of Ministry of Education, Central South University, Changsha 410083, China
3.
School of Civil Engineering, Chongqing University, Chongqing 400045, China
4.
Hunan Pingjiang Pumped Storage Corporation Limited, Yueyang Hunan 414500, China

More Information

Author Bio:
LI Yongfeng, E-mail: 38853023@qq.com

Corresponding author: GAO Yuhao, E-mail: yhgao437@163.com

摘要

摘要:
针对全风化花岗岩地层注浆过程中存在"吃水不吃浆"、可灌性差以及浆液的稳定性问题，提出了一种新的复合注浆材料，以提高完全风化花岗岩的防渗和力学性能。通过一系列室内试验研究了不同水固比、超细膨润土含量和超细硅酸盐水泥含量对注浆材料工程性能和浆液形成机制的影响，确定了水泥浆的最佳配方，采用微观形貌试验揭示了2种超细材料对浆液流动性、稳定性和结石体强度的作用机理，最后通过现场试验验证了注浆材料的可注性和有效性。结果表明，水固比为1.2、超细膨润土和超细硅酸盐水泥掺量分别为10%、普通硅酸盐水泥掺量80%配方的复合浆液具有很好的流动性、稳定性和抗压强度，漏斗黏度为35.5 s，析水率为2.4%，7 d和28 d的抗压强度均大于5 MPa；复合材料中的超细膨润土的掺量对浆液性能起主导作用，超细膨润土含量及其水化胶体的形态与分布决定浆液稳定性，而适量的超细硅酸盐水泥增加了细颗粒含量，使得胶结体更易填充颗粒间隙，改善了浆液可注性和结石体强度；该复合注浆材料在现场试验中表现优异，具有良好的注浆性能，注浆后形成的墙体在防渗效果和加固性能上均满足设计要求。
- 全风化花岗岩 /
- 超细水泥 /
- 超细膨润土 /
- 压水试验 /
- 微观结构
Abstract: Objective
To solve the problems of "draught without slurry", poor groutability and slurry stability in the grouting process of completely weathered granite, a new composite grouting material is proposed in this paper to improve the anti-seepage and mechanical properties of completely weathered granite.
Methods
Through a series of laboratory experiments, it investigates the effects of different water-solid ratios, superfine bentonite, and superfine Portland cement content on the engineering properties of grouting materials. The formation mechanism of the slurry were studied, and the optimal formula of the cement slurry was determined. The experiment revealed the action mechanism of the two superfine materials on the fluidity, stability, and stone body strength of the grout. Finally, the castability and effectiveness of the grouting material were verified by a field test.
Results
The results show that the composite slurry with a water-solid ratio of 1.2, a content of superfine bentonite and superfine Portland cement of 10%, and a content of ordinary Portland cement of 80% has good fluidity, stability, and resistance. The funnel viscosity was 35.5 s, the water separation rate was 2.4%, and the compressive strengths at 7 d and 28 d were both greater than 5 MPa. The compressive strength and the content of superfine bentonite in the composite material play a leading role in the properties of the slurry. The content of superfine bentonite and the morphology and distribution of its hydrated colloids determine the stability of the slurry, while an appropriate amount of superfine Portland cement increases the content of fine particles, making it easier for the cement to fill the gaps between the particles and improving the injectability of the slurry and the strength of the stone body.
Conclusion
The composite grouting material has excellent performance in the field test and good grouting performance. The wall formed after grouting meets the design requirements in terms of the anti-seepage effect and reinforcement performance.
- completely weathered granite /
- superfine cement /
- superfine bentonite /
- water pressure test /
- microstructure
注释:

所有作者声明不存在利益冲突。

HTML全文

图 1 全风化花岗岩粒径级配曲线

Figure 1. Grain size distribution of CWG

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图 2 注浆材料粒径级配曲线

Figure 2. Grain size distribution of grouting materials

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图 3 不同水泥的漏斗黏度试验结果

Figure 3. Funnel viscosity test results of different cements

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图 4 不同水泥的析水率试验结果

Figure 4. Bleeding rate test results for different cements

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图 5 SSB的漏斗黏度试验结果

Figure 5. Funnel viscosity test results of SSB

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Figure 6. Filter loss test results of SSB

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图 7 抗压强度试验结果

Figure 7. Results of the compressive strength test

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图 8 SEM图

Figure 8. SEM images

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图 9 现场试验注浆孔和检查孔分布图(单位: mm)

Figure 9. Field test grouting hole and inspection hole distribution map

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图 10 注浆前后波速分布图

Figure 10. Distribution of wave velocity before and after grouting

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图 11 先导孔钻孔取心

a.孔深4.2~8.3 m段岩心; b.孔深44.7~49.0 m段岩心

Figure 11. Pilot hole drilling and coring

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图 12 检查孔钻孔取心

a.孔深4.0~8.0 m段岩心; b.孔深44.7~48.5 m段岩心

Figure 12. Inspection hole drilling and coring

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图 13 复合墙体开挖检查

a整体; b.侧墙

Figure 13. Composite wall excavation inspection

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表 1 全风化花岗岩基本物理性质指标

Table 1. Basic physical properties of CWG

密度/(g·cm^-3)	含水率/%	干密度/(g·cm^-3)	颗粒相对密度	孔隙比
1.73~2.00	13.9~21.7	1.42~1.58	2.618~2.635	0.435~0.852
注：试验按照文献[29]实施

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表 2 滤失量测定数据

Table 2. Data of filtration

水固比	SSB掺量w_B/%	SPC掺量w_B/%
		0	5	10	15
		滤失量/mL
1.2	6	108	106	102	105
1.3	6	118	112	116	112
1.4	6	132	119	109	117
1.2	8	101	93	89	85
1.3	8	113	103	91	101
1.4	8	117	110	104	109
1.2	10	74	72	69	71
1.3	10	75	73	71	74
1.4	10	85	84	82	83

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表 3 SCBS流动性和稳定性试验

Table 3. Fluidity and stability test of SCBS

水固比	SSB掺量w_B/%	SPC掺量w_B/%	OPC掺量w_B/%	漏斗黏度/s	析水率/%
1.2	4	16	80	31.7	16.0
1.2	6	14	80	32.6	9.0
1.2	8	12	80	33.2	6.5
1.2	10	10	80	35.5	2.4

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表 4 SCBS性能

水固比	SSB掺量w_B/%	SPC掺量w_B/%	OPC掺量w_B/%	漏斗黏度/s	析水率/%
1.2	10	10	80	34.8~36.2	2~3

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表 5 注浆前后压水试验结果

Table 5. Results of the water pressure test before and after grouting

孔号	透水率/Lu									平均透水率/Lu
X₁	75.16	48.16	17.44	28.75	16.94	13.16	101.92	5.43	11	28.94
J₁	1.74	0	0.58	0.21	0.54	0	0.21	0.11	0.08	0.32
J₂	0.69	0.16	0	0.18	0.18	1.39	0	0.05	0.10	0.26
J₃	2.08	0	0	0.80	0	0	0.56	/	/	0.30
J₄	1.02	0.20	0	1.25	0	0.38	0.09	0.15	2.50	0.50

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