磷尾矿—EPS玄武岩纤维改良膨胀土试验研究
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摘要
以安徽某公路工程膨胀土为研究对象,在保持含水率和干密度不变的情况下,依次将磷尾矿、EPS颗粒、玄武岩纤维按不同比例掺入膨胀土中,基于最佳掺量进行改良土试验,试验结果表明:适量磷尾矿改良膨胀土能有效降低膨胀土的膨胀率,提高膨胀土的抗压强度和剪切强度,掺量为7. 5%时效果最佳。同时对抗剪强度指标分析,粘聚力与掺量成线性关系,内摩擦角与掺量成二次多项式关系; EPS能抑制膨胀土的膨胀性,但会降低膨胀土的抗压强度和延性,掺量为20%最佳;玄武岩纤维对复合改性土抗压强度贡献很小,但能增强其延性;最终得到磷尾矿、EPS和玄武岩纤维最佳掺量分别为7. 5%,20%,0. 4%。
Conducting the research of modified soil,phosphorus tailings,EPS particles and basalt fibers are infiltrated into the expansive soil taken from a highway project in Anhui province at different mass ratio while maintaining the same moisture content and dry density of the soil. The result showed that appropriate amount of tailings modified expansive soil can effectively reduce the expansion rate of expansive soils,and improve the compressive strength and shear strength of expansive soils. While based on the analysis of shear strength index,cohesion and dosage is a linear relationship,internal friction angle and dosage form a second order polynomial relationship. EPS can inhibit the swelling of expansive soil,but will reduce the compressive strength and ductility of expansive soil,the best content is 20%. Basalt fiber contributes little to compressive strength of composite modified soil,but can enhance its ductility. It is concluded that the optimal contents of EPS and basalt fiber were 7. 5%,20% and 0. 4% respectively.
Conducting the research of modified soil,phosphorus tailings,EPS particles and basalt fibers are infiltrated into the expansive soil taken from a highway project in Anhui province at different mass ratio while maintaining the same moisture content and dry density of the soil. The result showed that appropriate amount of tailings modified expansive soil can effectively reduce the expansion rate of expansive soils,and improve the compressive strength and shear strength of expansive soils. While based on the analysis of shear strength index,cohesion and dosage is a linear relationship,internal friction angle and dosage form a second order polynomial relationship. EPS can inhibit the swelling of expansive soil,but will reduce the compressive strength and ductility of expansive soil,the best content is 20%. Basalt fiber contributes little to compressive strength of composite modified soil,but can enhance its ductility. It is concluded that the optimal contents of EPS and basalt fiber were 7. 5%,20% and 0. 4% respectively.
引文
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[6]庄心善,余晓彥.石灰—玄武岩纤维改性膨胀土强度特性的试验研究[J].土木工程学报,2015,48(1):166-170.
[7]庄心善,游鹏,余晓彥,等.粉煤灰—玄武岩纤维改良膨胀土试验研究[J].公路工程,2016(3):1-4+48.
[8]葛春兰,邹维列,夏熙临,等. EPS用于膨胀土渠坡稳定的压缩与蠕变特性试验研究[J].长江科学院院报,2014,31(9):65-73.
[9]汪明武,李健,徐新宇,等.非饱和石灰改良膨胀土应力松弛试验研究[J].工业建筑,2016,46(9):93-98.
[10]刘之葵,晓娟,雷轶,等.水泥改良桂林红粘土的试验研究[J].公路工程,2016,41(1):6-9.
[2]查甫生,郝爱龄,赵林,等.电石渣改良膨胀土试验研究[J].工业建筑,2014,44(5):65-69.
[3]孙树林,郑青海,唐俊,等.碱渣改良膨胀土室内试验研究[J].岩土力学,2012,33(6):1608-1612.
[4]庄心善,苑立森,梅利芳.聚丙烯纤维EPS轻质混合土抗压强度试验研究[J].水电能源科学,2014,32(7):97-100,104.
[5]刘宇翼,周国庆,苏运河,等.聚苯乙烯泡沫塑料颗粒-膨胀土混合料的胀缩特性试验研究[J].工业建筑,2017,47(5):90-95.
[6]庄心善,余晓彥.石灰—玄武岩纤维改性膨胀土强度特性的试验研究[J].土木工程学报,2015,48(1):166-170.
[7]庄心善,游鹏,余晓彥,等.粉煤灰—玄武岩纤维改良膨胀土试验研究[J].公路工程,2016(3):1-4+48.
[8]葛春兰,邹维列,夏熙临,等. EPS用于膨胀土渠坡稳定的压缩与蠕变特性试验研究[J].长江科学院院报,2014,31(9):65-73.
[9]汪明武,李健,徐新宇,等.非饱和石灰改良膨胀土应力松弛试验研究[J].工业建筑,2016,46(9):93-98.
[10]刘之葵,晓娟,雷轶,等.水泥改良桂林红粘土的试验研究[J].公路工程,2016,41(1):6-9.