Analysis of the anti-erosion effectiveness of polypropylene fiber (PPF) cement-reinforced soil for slope protection
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摘要:
以水泥和聚丙烯纤维在粉质黏土边坡坡面抗冲刷防护应用为背景，探讨了聚丙烯纤维水泥加固粉质黏土边坡的抗冲刷有效性。基于室内试验，开展水泥和纤维的掺量对粉质黏土抗剪强度影响试验，并基于试验配比进行边坡冲刷模拟。结果表明：水泥掺量与粉质黏土的抗剪强度呈正相关，聚丙烯纤维可进一步提高加固土的黏聚力；边坡坡比对土体的抗冲刷效果呈先增大后减小的影响；与未加固的素土坡面相比，加固后的边坡坡面抗冲刷能力得到显著提高，从SEM试验中发现，加固土抗冲刷能力提高是由于水泥水化作用和聚丙烯纤维的分散排列使加固后的土壤颗粒相互吸引，形成了坚固的结构，从而提高了土壤抗渗透性。研究结果为边坡抗冲刷防护提供了新的工程应用思路。
Abstract:Taking the application of cement and polypropylene fiber in the protection of silty clay slope as the research background, this paper explores the validity analysis of polypropylene fiber cement reinforcement material on the anti-erosion ability of silty clay slope. Based on indoor experiments, the research investigated the effects of varying cement and fiber content on the shear strength of silty clay. A slope erosion model experiment was conducted based on predetermined experimental ratios. The results indicate a positive correlation between cement content and the shear strength of silty clay. Additionally, polypropylene fiber was found to further improve the cohesion of the reinforced soil. The slope ratio initially enhances and then diminishes the anti-erosion effect on the soil. Compared to unreinforced slopes, the erosion resistance of the strengthened side slope is significantly improved. Scanning electron microscopy (SEM) analyses revealed that the improved erosion resistance of the reinforced soil results from the hydration of cement and the dispersed arrangement of polypropylene fibers, which promote interparticle cohesion and form a robust structure, thereby enhancing the soil’s impermeability. The research results offer novel engineering application insights for protecting slopes against erosion.
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Key words:
- polypropylene fiber /
- reinforced soil /
- shear strength /
- scour test /
- slope stability
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表 1 试验用土的物理性质
Table 1. Physical properties of test soils
参数 天然含水率/% 最优含水率/% 塑限 液限 塑性指数 最大干密度
/（g·cm−3）粒径/% >0.25 mm 0.25～0.075 mm <0.075 mm 取值 11.5 12 18.09 33.54 15.45 2.28 6.88 28.26 64.86 
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表 2 聚丙烯纤维主要物理特性
Table 2. Physical properties of polypropylene fibers
类型 直径/mm 密度/（g·cm−3） 抗拉强度/MPa 弹性模量/MPa 熔点/°C 燃点/°C 耐酸碱性 束状单丝 3 0.91 ≥350 ≥ 3500 160 550 极强
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表 3 试验主要参数
Table 3. Main parameters of the experiment
组数 土壤类型 坡比 放水流量/（L·h−1） 8组 素土
聚丙烯纤维加固土1∶1.73 50 100 150 200 10组 素土
聚丙烯纤维加固土1∶1.73 100 1∶1.19 1∶1 1∶0.84 1∶0.58
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