TITLE:
Reinforcement Effect and Permeability Assessment of Gravel-Tire Chips Mixture (GTCM) for Use in Marine Landfill
AUTHORS:
Chunrui Hao, Hemanta Hazarika, Yusaku Isobe
KEYWORDS:
Compressibility, Gravel-Tire Chips Mixture, Marine Landfill, Permeability, Settlement
JOURNAL NAME:
Open Journal of Civil Engineering,
Vol.12 No.2,
June
7,
2022
ABSTRACT: The
number of marine landfills in Japan has increased over the past decade due to
the lack of suitable land. For marine landfills, protection of the alluvium
clay layer and improvement of the drainage performance in waste inflow are
important aspects. In this paper, an economical construction method for these problems is proposed using gravel-tire
chips mixture (GTCM) as the horizontal
reinforcement and drainage medium beneath the waste. The content and particle
size of tire chips mixed with gravel are essential factors that affect
the bearing capacity and permeability of the reinforcement layer. Therefore, a
series of permeability tests are conducted using newly developed large-scale
triaxial compression and permeability test apparatus to investigate the effect
of tire chips particle size, the mass proportion of tire chips (MPTC), and
triaxial stress on the permeability of GTCM. In addition, the effectiveness of
this technique is evaluated by numerical simulations. The experimental results
confirm that the shear strength of GTCM is influenced by tire chips content. Furthermore,
permeability coefficient of GTCM is on the order of 0.02 cm/s to 0.08 cm/s,
which is higher than the tolerable level of permeability of drainage
layer in landfills. GTCM sample shows excellent permeability even on higher
compression. Moreover, the Non-Darcy flow properties of GTCM (non-linear) are
introduced in this study, and an approximate power function relationship
between the permeability coefficient and the non-Darcy flow coefficient is
developed. The numerical results confirm that GTCM performs better than the
sand, a traditional reinforcement material.