聚丙烯纤维加筋对高岭土固结压缩特性影响试验研究

发布时间：2018-11-15 16:40

【摘要】：工程中为了改良压实黏土的强度和抗干裂性能,将分散的聚丙烯纤维均匀掺入土体中制成纤维加筋土。利用聚丙烯纤维与高岭土在室内人工拌和并压制成纤维加筋土样,基于一维固结试验研究了控制干密度条件下纤维加筋掺量与长度对加筋高岭土固结、压缩特性的影响规律。研究结果表明,在控制干密度和纤维长度条件下,随着纤维掺量的增加,加筋土的固结系数和压缩模量均先增大后减小;掺量为0.2%时固结系数最大,掺量为0.1%~0.15%时压缩模量最大;在控制干密度和纤维掺量条件下,随着纤维长度的增加,加筋土的固结系数先减小后增大,纤维长度为10 mm时固结系数最小;当固结压力较高(≥400 k Pa)时,加筋土的压缩模量随纤维长度增大而减小。此外,加筋土的压缩指数总体上随纤维掺量和纤维长度的增大而增大,但纤维掺量为0.15%~0.20%以及纤维长度为10 mm时压缩指数有一极小值。
[Abstract]:In order to improve the strength and dry-cracking resistance of compacted clay, the dispersed polypropylene fiber was mixed into soil to make fiber reinforced soil. Based on one-dimensional consolidation experiments, the effects of fiber reinforced content and length on the consolidation and compression characteristics of reinforced kaolin were studied by using polypropylene fiber and kaolin in laboratory artificial mixing and compaction to form fiber reinforced soil samples. The results show that under the condition of controlling dry density and fiber length, the consolidation coefficient and compression modulus of reinforced soil increase first and then decrease with the increase of fiber content. The consolidation coefficient is the largest when the content is 0.2 and the modulus of compression is the largest when the content is 0.1 ~ 0.15; Under the condition of controlling dry density and fiber content, the coefficient of consolidation of reinforced soil decreases first and then increases with the increase of fiber length, and the coefficient of consolidation is the smallest when the length of fiber is 10 mm. When the consolidation pressure is higher (鈮，

本文编号：2333841