| 黄土渗透和强度性能的改良优化 |
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| 引用本文： | 朱敏,倪万魁,苑康泽,李兰,李向宁,王海曼.黄土渗透和强度性能的改良优化[J].煤田地质与勘探,2020,48(6):195-200. |
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| 作者姓名： | 朱敏 倪万魁 苑康泽 李兰 李向宁 王海曼 |
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| 作者单位： | 长安大学 地质工程与测绘学院,陕西 西安 710054;长安大学 地质工程与测绘学院,陕西 西安 710054;长安大学 地质工程与测绘学院,陕西 西安 710054;长安大学 地质工程与测绘学院,陕西 西安 710054;长安大学 地质工程与测绘学院,陕西 西安 710054;长安大学 地质工程与测绘学院,陕西 西安 710054 |
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| 基金项目： | 陕西省重点研发计划项目 |
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| 摘 要： | 为探寻适用于黄土地区海绵城市建设的具有较高强度和防渗性能的路基换填材料，通过对掺入水泥、聚丙烯纤维、膨润土的黄土进行强度和渗透性试验，并基于正交试验和田口方法的信噪比分析，获得了改良黄土各掺量的最优配比方案。结果表明:水泥掺量对改良黄土的无侧限抗压强度影响最显著，聚丙烯纤维掺量和长度对其渗透系数影响最大；改良黄土各掺量的最优配比为聚丙烯纤维长度取12 mm、聚丙烯纤维掺量取0.3%、膨润土和水泥掺量分别取3%和8%；在3、7、14 d养护龄期下，最优配比改良黄土的强度和渗透性能均优于不同配比的石灰改良黄土。改良的黄土各掺量最优配比可为黄土地区海绵城市道路建设中的路基处理提供参考。
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| 关 键 词： | 改良黄土 聚丙烯纤维 膨润土 无侧限抗压强度 渗透系数 |
| 收稿时间： | 2020-04-22 |
Improvement and optimization of permeability and strength properties of loess |
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| Abstract: | When constructing a sponge city in a collapsible loess region, the reinforcement of the loess roadbed needs to consider the permeability. In order to explore the roadbed fillers with higher strength and impermeability suitable for the construction of sponge city in loess area, this experimental study was performed to investigate the effect of polypropylene fibers in combination with cement and bentonite as a new stabilizer for improving the geotechnical properties of the loess. The Taguchi method was applied to the experiments and a standard L9 Orthogonal Array with four factors(Polypropylene fiber length, Polypropylene fiber content, cement content and bentonite content) and three levels were chosen. A series of unconfined compression and permeability tests were conducted on each specimen. And the signal-to-noise ratio analysis of orthogonal test and Taguchi method had obtained the optimal proportioning scheme for each mixing amount of improved loess. The results of these tests showed:that the most effective material for increasing the unconfined compressive strength of the samples was cement. Polypropylene fiber has the greatest influence on the permeability coefficient of the samples. Taking unconfined compressive strength and permeability coefficient as evaluation indexes, the optimum conditions for curing times of 3 days were Polypropylene fiber length(12 mm)、content(0.3%), cement content(8%) and bentonite content(3%). The optimum conditions test results were also superior in comparison with the lime-loess at 3, 7, and 14 days of curing time. The results of the study provide some reference for the subgrade treatment in sponge city road construction. |
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