Characteristics and comparative analysis of compressive and shear strengths of modified high-water materials
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摘要: 以高水充填材料為載體，用聚乙烯塑料（PE）對其進行改性，研究了改性高水材料的抗壓、抗剪強度特征，并對結果進行了對比分析。結果表明：隨PE粉摻量的增加，改性高水材料的抗壓、抗剪強度均呈現降低的趨勢，改性高水材料各應力應變曲線與純高水材料有明顯區別，純高水材料的殘余強度更高，改性高水材料的殘余強度普遍較低，而剪切位移曲線變化不明顯；PE粉的加入明顯改變了材料的生成物形貌以及微觀結構，隨摻量的增加逐漸由纖維網狀結構向絮凝塊狀結構變化，而且生成物之間更容易形成尺寸較大的貫穿孔洞；改性高水材料的抗剪強度明顯低于抗壓強度，表明改性類高水充填材料不宜用于傾角較大的煤層。Abstract: Pollution from waste plastics has become one of today’s most serious environmental problems, and the recycling of waste plastics is a research hotspot. High-water materials are widely used in mine-filling operations, leak prevention, flame-retardant fire extinguishers, and other related applications due to their advantages of not blocking pipes, ease of pumping, high early strength, and environmental friendliness. These materials are also commonly referred to as high-water quick-setting materials and high-water filling materials. Despite their advantages, high-water materials also have some shortcomings in practical applications such as the need for a large volume of materials and their high engineering costs. Currently, research on waste-doped modified high-water materials has become an important focus in the development of high-water materials. Using this approach, waste can be treated effectively at a reduced cost by the appropriate replacement of materials. The high-water filling material modified with polyethylene plastic (PE) was used as a carrier. The compressive and shear strengths of the modified materials were determined, and the results were compared and analyzed. The results reveal that with increases in the PE powder content, the compressive and shear strengths of the modified high-water material exhibit a decreasing trend. The stress–strain curves of the modified high-water material obviously differ from those of unmodified high-water material. The residual strength of the unmodified material is higher, that of the modified high-water material is generally low, and no shear displacement curve is evident. The addition of PE powder obviously changes the morphology and microstructure of the material. With increasing PE content, the material gradually changes from having a fiber network structure to a flocculated block structure, in which the formation of larger through holes easily occurs between the products. The shear strength of the modified high-water material is significantly lower than the compressive strength, which indicates that the modified high-water filling is not suitable for coal seams with a large inclination.
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Key words:
- waste plastic /
- high-water material /
- compressive strength /
- shear strength /
- micromorphology
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圖 3 不同養護齡期的摻PE粉高水材料單軸壓縮應力–應變曲線。（a）3 d；（b）7 d；（c）14 d；（d）28 d
Figure 3. Uniaxial compressive stress–strain curves of PE-powder-doped high-water materials with different curing ages: (a) 3 d; (b) 7 d; (c) 14 d; (d) 28 d
圖 4 不同養護齡期的摻PE粉高水材料抗壓強度
Figure 4. Compressive strengths of PE-powder-doped high-water materials with different curing ages
圖 5 不同摻量PE粉高水材料單軸抗壓破壞形式。（a）C；（b）D；（c）E；（d）F；（d）G
Figure 5. Photographs of uniaxial compressive failure modes of high-water materials with different amounts of PE powder: (a)C; (b)D; (c)E; (d)F; (d)G
圖 6 不同養護齡期的摻PE粉高水材料剪切應力–位移曲線。（a）3 d；（b）7 d；（c）14 d；（d）28 d
Figure 6. Shear stress?displacement curves of PE-powder-doped high-water materials with different curing ages: (a) 3 d; (b) 7 d; (c) 14 d; (d) 28 d
圖 7 不同養護齡期的摻PE粉高水材料剪切強度
Figure 7. Shear strengths of PE-doped high-water materials with different curing ages
圖 9 不同摻量PE粉高水材料剪切破壞形式。（a）C；（b）D；（c）E；（d）F；（d）G
Figure 9. Photographs of the shear failures of high-water materials with different amounts of PE powder: (a) C; (b) D; (c) E; (d) F; (d) G
圖 10 不同放大倍數下的微觀形貌圖。（a），（b）D類材料試件；（c），（d）G類材料試件
Figure 10. Micromorphologies of high-water materials at different magnifications: (a), (b) type of D specimen; (c), (d) type of G specimen
圖 11 不同傾角的高水材料充填體受力形式。（a）傾角為0；（b）傾角為θ
Figure 11. Schematic illustration of forces acting on high-water material filling bodies with different inclination angles: (a) inclination angle of 0; (b) inclination angle of θ
表 1 材料配比表
Table 1. Material proportions
g Type of specemen Quality of material A Quality of material A–A Quality of material B Quality of material B–B Quality of PE Quality of water C 120 12 120 4.8 0 770.4 D 120 12 120 4.8 12.84 808.92 E 120 12 120 4.8 25.68 847.44 F 120 12 120 4.8 38.52 885.96 G 120 12 120 4.8 51.36 924.48 
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久色视频表 2 計算得到的θ值
Table 2. Calculated θ values
° Type of specimen Curing for
3 dCuring for
7 dCuring for
14 dCuring for
28 dC 15.4 14.7 13.1 8.8 D 12.1 14 14.1 14.3 E 19 18.9 11.7 13.5 F 18.4 14.7 12.3 18.7 G 33.1 20.2 15.6 18.8
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