碎粉岩地层丙烯酸盐基注浆加固体水稳性研究

doi:10.6040/j.issn.1672-3961.0.2024.341

摘要/Abstract

摘要： 针对富水环境下丙烯酸盐基注浆材料加固碎粉岩地层时强度劣化机制不明确的问题,研究材料组分与地下水侵蚀离子(Cl^-,OH^-)对碎粉岩注浆加固体力学性能的影响规律。通过研究主剂((CH₂CHCOO)₂Ca、(CH₂CHCOO)₂Mg)、改性剂(α-CaSO₄·0.5H₂O)和交联剂(C₁₄H₁₈O₇)掺量(单一组分与改性丙烯酸盐基注浆材料溶液的质量分数)变化对碎粉岩注浆加固体复合离子环境下力学性能影响,确定丙烯酸盐基注浆材料配合比;开展不同Cl^-体积浓度、pH及侵蚀龄期的富水离子环境侵蚀模拟试验,测试碎粉岩注浆加固体的单轴抗压强度;利用红外光谱(FTIR)揭示侵蚀机理,利用低场核磁共振成像(LF-NMRI)分析微观结构演变规律。结果表明,改性剂(α-CaSO₄·0.5H₂O)掺量的变化是碎粉岩注浆加固体抗压强度提升的主要因素;Cl^-体积浓度和pH升高及侵蚀龄期延长导致碎粉岩注浆加固体单轴抗压强度持续下降,极端碱性条件(pH=14)下加固体5 d内完全丧失抗压强度;Cl^-取代注浆材料凝胶体结构中的羟基(—OH),破坏了氢键,OH^-对注浆材料凝胶体有机网络结构中的酯基(—COO—)造成破坏,低场核磁共振成像表明二者侵蚀会加速碎粉岩注浆加固体内部孔隙的生成。

关键词: 丙烯酸盐基注浆材料, 碎粉岩地层, 富水环境, 离子侵蚀, 劣化机制

Abstract: In view of the problem that the strength deterioration mechanism of acrylate-based grouting materials was unclear when reinforcing ultracataclasite strata in water-rich environment, this study investigated the effects of material composition and groundwater corrosive ions(Cl^-, OH^-)on the mechanical properties of the grouting-solids of ultracataclasite. By studying the effects of the change in dosage(Mass ratio of single-component to modified acrylate-based grouting material solution)of main agent((CH₂CHCOO)₂Ca,(CH₂CHCOO)₂Mg), modifier(α-CaSO₄·0.5H₂O)and crosslinker(C₁₄H₁₈O₇)on the mechanical properties of the grouting-solids of ultracataclasite in composite ion environment, the mix ratio of the acrylate-based grouting materials was determined. Simulation experiments was carried out on water-rich ion environment erosion experiments at different Cl^- volume concentrations, pH and erosion ages, the uniaxial compressive strength of grouting-solids of ultracataclasite was tested. Infrared spectroscopy(FTIR)was used to reveal the erosion mechanism, and low-field magnetic resonance imaging(LF-NMRI)was used to analyze the evolution of microstructure. The results showed that the change of modifier(α-CaSO₄·0.5H₂O)was the main factor for the improvement of the compressive strength of the grouting-solids of ultracataclasite. The increase of Cl^- volume concentrations, pH and the prolongation of age led to a continuous decrease in the uniaxial compressive strength of grouting-solids of ultracataclasite, and the compressive strength completely disappeared within 5 days under extreme alkaline conditions(pH=14). Cl^- replaced the hydroxyl group(—OH)in the structure of the grouting material gel and broke the hydrogen bond, while OH^- destroyed the ester group(—COO—)in the organic network structure of the grouting material. The results of low-field magnetic resonance imaging showed that the erosion of the two accelerated the formation of internal pores in the grouting-solids of ultracataclasite. The research findings offered reliable support for the optimization of ion erosion resistance of modified acrylate-based grouting materials and the evaluation of their service performance in practical engineering.

Key words: acrylic-based grouting material, ultracataclasite strata, water-rich environment, ionic erosion, deterioration mechanism

中图分类号:

TU52

阮鹏飞,宓祥云,林春金,李召峰,杨磊,张健,孙科科. 碎粉岩地层丙烯酸盐基注浆加固体水稳性研究[J]. 山东大学学报 (工学版), 2026, 56(1): 133-141.

RUAN Pengfei, MI Xiangyun, LIN Chunjin, LI Zhaofeng, YANG Lei, ZHANG Jian, SUN Keke. Study on water stability of acrylate-based grouting-solids of ultracataclasite strata[J]. Journal of Shandong University(Engineering Science), 2026, 56(1): 133-141.

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