Investigation on the pore size characteristics and mechanical properties of grouting materials scoured by flow water

IF 7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL International Journal of Rock Mechanics and Mining Sciences Pub Date : 2024-09-25 DOI:10.1016/j.ijrmms.2024.105923
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Abstract

Investigating the pore size characteristics and mechanical properties of the stone bodies formed by residual grout is crucial for understanding the authentic permeability and load-bearing capacity of grouting materials after being scoured by water flow. In this study, the pore size distribution, porosity, uniaxial compressive strength (UCS), and elastic modulus (E) of stone bodies formed by residual grout from polyacrylate latex-modified cement grouting material (PLMC) were systematically investigated, and pure cement grout (PC) as a control group. First, scouring tests were conducted on grouting materials with various water-to-cement ratios (w/c, 0.6–0.8) and polymer-cement ratios (p/c, 0–0.2) under different flow velocities (0–1 m/s). Subsequently, the pore size characteristics of stone bodies formed by residual grout under various conditions were studied via nuclear magnetic resonance test. Finally, the uniaxial compression tests were conducted to investigate the impact of water scouring on the mechanical properties of grouting materials, and the relationship between pore size characteristics and macro mechanical responses was analyzed. Results show that the stone bodies formed by residual grout compared to the non-scoured state develop mesopores and macropores, and the number of micropores also increased significantly. This porosity escalation results in a reduction in UCS and E. When the flow velocity reaches 1 m/s, the porosity of PLMC with w/c = 0.8 increases by 2.95 %, while UCS decreases by 14.6 % and E decreases by 37.4 %. PC demonstrates more pronounced changes, with a porosity increase of 7.01 %, UCS decreases by 32.9 %, and E decreases by 41.5 %. With the rise in w/c, the deterioration of pore structure and mechanical properties of the stone bodies formed by residual grout is more significant compared to the non-scoured state. Increasing p/c can mitigate the deterioration of the pore structure and mechanical properties. The findings provide meaningful guidance for the grouting reinforcement under dynamic water conditions.
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流水冲刷灌浆材料的孔径特征和力学性能研究
研究残余灌浆料形成的石体的孔径特征和力学性能,对于了解灌浆材料经水流冲刷后的真实渗透性和承载能力至关重要。本研究系统研究了聚丙烯酸酯胶乳改性水泥灌浆材料(PLMC)残留灌浆料形成的石体的孔径分布、孔隙率、单轴抗压强度(UCS)和弹性模量(E),并以纯水泥灌浆料(PC)作为对照组。首先,对不同水灰比(w/c,0.6-0.8)和聚合物水泥比(p/c,0-0.2)的灌浆材料在不同流速(0-1 m/s)下进行了冲刷试验。随后,通过核磁共振测试研究了不同条件下残余灌浆料形成的石体的孔径特征。最后,通过单轴压缩试验研究了水冲刷对灌浆材料力学性能的影响,并分析了孔径特征与宏观力学响应之间的关系。结果表明,与未冲刷状态相比,残留灌浆料形成的石体会产生中孔和大孔,微孔数量也显著增加。当流速达到 1 米/秒时,w/c = 0.8 的 PLMC 的孔隙率增加了 2.95%,而 UCS 减少了 14.6%,E 减少了 37.4%。PC 的变化更为明显,孔隙率增加了 7.01%,UCS 减少了 32.9%,E 减少了 41.5%。与未浇注状态相比,随着 w/c 的增加,残留灌浆料形成的石体的孔隙结构和机械性能的劣化更为显著。提高 p/c 可以缓解孔隙结构和机械性能的恶化。研究结果为动水条件下的灌浆加固提供了有意义的指导。
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来源期刊
CiteScore
14.00
自引率
5.60%
发文量
196
审稿时长
18 weeks
期刊介绍: The International Journal of Rock Mechanics and Mining Sciences focuses on original research, new developments, site measurements, and case studies within the fields of rock mechanics and rock engineering. Serving as an international platform, it showcases high-quality papers addressing rock mechanics and the application of its principles and techniques in mining and civil engineering projects situated on or within rock masses. These projects encompass a wide range, including slopes, open-pit mines, quarries, shafts, tunnels, caverns, underground mines, metro systems, dams, hydro-electric stations, geothermal energy, petroleum engineering, and radioactive waste disposal. The journal welcomes submissions on various topics, with particular interest in theoretical advancements, analytical and numerical methods, rock testing, site investigation, and case studies.
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