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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。
In order to improve the strength and dry crack resistance of compacted clay in the project, the dispersed polypropylene fiber is uniformly blended into the soil to make the fiber reinforced earth. Using polypropylene fiber and kaolin mixed indoors manually and pressed into fiber-reinforced soil samples, the effect of fiber reinforcement dosage and length under controlled dry density on consolidation and compression properties of reinforced kaolin was studied based on one-dimensional consolidation experiment law. The results show that under the condition of controlling the dry density and the fiber length, the consolidation coefficient and the compressive modulus of the reinforced soil first increase and then decrease with the increase of the fiber content. When the content is 0.2%, the consolidation coefficient The compressive modulus is the maximum when the content is 0.1% ~ 0.15%. Under the condition of controlling the dry density and fiber content, the consolidation coefficient of the reinforced soil first decreases and then increases with the increase of the fiber length. The fiber length When the consolidation pressure is higher (≥400 kPa), the compressive modulus of reinforced soil decreases with the increase of fiber length. In addition, the compressive index of reinforced soil generally increases with the increase of fiber content and fiber length, but the compressibility index has a minimum value when the fiber content is 0.15% ~ 0.20% and the fiber length is 10 mm.