Journal of Shandong University(Engineering Science) ›› 2026, Vol. 56 ›› Issue (1): 133-141.doi: 10.6040/j.issn.1672-3961.0.2024.341

• Civil Engineering • Previous Articles    

Study on water stability of acrylate-based grouting-solids of ultracataclasite strata

RUAN Pengfei, MI Xiangyun, LIN Chunjin*, LI Zhaofeng, YANG Lei, ZHANG Jian, SUN Keke   

  1. RUAN Pengfei, MI Xiangyun, LIN Chunjin*, LI Zhaofeng, YANG Lei, ZHANG Jian, SUN Keke(Institute of Geotechnical and Underground Engineering, Shandong University, Jinan 250061, Shandong, China
  • Published:2026-02-03

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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

CLC Number: 

  • TU52
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