【摘要】：工程中為了改良壓實黏土的強度和抗干裂性能,將分散的聚丙烯纖維均勻摻入土體中制成纖維加筋土。利用聚丙烯纖維與高嶺土在室內(nèi)人工拌和并壓制成纖維加筋土樣,基于一維固結(jié)試驗研究了控制干密度條件下纖維加筋摻量與長度對加筋高嶺土固結(jié)、壓縮特性的影響規(guī)律。研究結(jié)果表明,在控制干密度和纖維長度條件下,隨著纖維摻量的增加,加筋土的固結(jié)系數(shù)和壓縮模量均先增大后減小;摻量為0.2%時固結(jié)系數(shù)最大,摻量為0.1%~0.15%時壓縮模量最大;在控制干密度和纖維摻量條件下,隨著纖維長度的增加,加筋土的固結(jié)系數(shù)先減小后增大,纖維長度為10 mm時固結(jié)系數(shù)最小;當(dāng)固結(jié)壓力較高(≥400 k Pa)時,加筋土的壓縮模量隨纖維長度增大而減小。此外,加筋土的壓縮指數(shù)總體上隨纖維摻量和纖維長度的增大而增大,但纖維摻量為0.15%~0.20%以及纖維長度為10 mm時壓縮指數(shù)有一極小值。
[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，

本文編號：2333841