Element tests on the hydraulic/mechanical behaviour of unsaturated decomposed granite soil under various conditions

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
Xi Xiong ◽  
Yonglin Xiong ◽  
Shogo Okino ◽  
Ryota Mikami ◽  
Junnan Ma ◽  
...  
Keyword(s):  
Mechanical Behaviour ◽  
Decomposed Granite ◽  
Granite Soil

Evaluation of the physical properties of water treatment residue for use as a soil substitute compared with decomposed granite soil

2010 ◽  
Vol 56 (3) ◽  
pp. 361-365 ◽  
Author(s):  
Seok-Gon Park ◽  
Mizue Ohashi ◽  
Kiyoshi Kurosawa ◽  
Young-Jin Kim ◽  
Hisashi Yahata
Keyword(s):  
Water Treatment ◽  
Physical Properties ◽  
Decomposed Granite ◽  
Granite Soil

The effect of pore-water pressure on NATM tunnel linings in decomposed granite soil

2005 ◽  
Vol 42 (6) ◽  
pp. 1585-1599 ◽  
Author(s):  
J H Shin ◽  
D M Potts ◽  
L Zdravkovic
Keyword(s):  
Pore Water ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Drainage System ◽  
Tunnel Lining ◽  
Natm Tunnel ◽  
Decomposed Granite ◽  
Secondary Lining ◽  
Granite Soil ◽  
Functional Components

Tunnelling in a water bearing soil often produces a long-term interaction between the tunnel lining and the surrounding soil. With respect to lining design, infiltration and external pore-water pressures are often one of the most important factors to be considered. Development of pore-water pressure may accelerate leakage and cause deterioration of the lining. This can be particularly troublesome to structural and functional components of the tunnel and can often lead to structural failure. However, as a result of the complicated hydraulic boundary conditions and the long times often required for pore pressure equilibration, research on this subject is scarce. Consequently, most design approaches deal with the effects of pore-water pressure on the tunnel lining in a qualitative manner. In this paper, the development of pore-water pressure and its potential effects on the tunnel lining are investigated using the finite element method. In particular, the deterioration of a drainage system caused by clogging is considered. It is shown that the development of pore-water pressure on the lining is dependent on the lining permeability and the deterioration of the drainage system, particularly for a tunnel with both a primary and a secondary lining. The magnitude of pore-water pressure on a new Austrian tunnelling method (NATM) tunnel constructed in decomposed granite soil and the effect of tunnel shape are investigated. Design curves for estimating pore-water pressure loads on a secondary lining are proposed.Key words: numerical analysis, tunnel lining, decomposed granite.

scholarly journals Amorphous Materials in Decomposed Granite Soil and Their Properties

1984 ◽  
Vol 24 (2) ◽  
pp. 180-190
Author(s):  
Kazuhiko Nishida ◽  
Seiichi Sasaki ◽  
Yorimichi Kuboi
Keyword(s):  
Amorphous Materials ◽  
Decomposed Granite ◽  
Granite Soil

scholarly journals Effects of inclusion of granulated rubber tires on the mechanical behaviour of a compressive sand

2020 ◽  
Vol 57 (5) ◽  
pp. 763-769 ◽  
Author(s):  
W. Li ◽  
C.Y. Kwok ◽  
K. Senetakis
Keyword(s):  
Particle Size ◽  
Shear Strength ◽  
Mechanical Behaviour ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Rubber Content ◽  
Filling Materials ◽  
Rubber Particles ◽  
Decomposed Granite ◽  
Completely Decomposed Granite

Drained triaxial shearing tests were performed on a well-graded compressive sand (completely decomposed granite, CDG) and its mixtures with granulated rubber tires to investigate the effects of rubber size and content on their mechanical behaviour. Three sizes of rubber particles, GR1, GR2, and GR3, were used with size ratios to CDG (D50,rubber : D50,CDG) of 0.9, 3.5, and 7.2, respectively, and the rubber content ranged from 0% to 30%. The results show that for CDG–GR1 mixtures, the strength decreases with increasing rubber content, while for CDG–GR2 and CDG–GR3 mixtures, the strength decreases only at 10% rubber content and then increases markedly with increasing rubber content. The increase of strength is mainly because the inclusion of large rubber particles widens the particle size distributions of the mixtures, resulting in denser packings. The denser packings also lead to a decrease in compressibility. At larger size ratio and higher rubber content, the CDG–rubber mixtures show higher shear strength and lower compressibility than pure CDG, which indicates the CDG–rubber mixtures are very suitable to be used as filling materials.

The intrinsic behaviour of a decomposed granite soil

Géotechnique ◽  
1995 ◽  
Vol 45 (1) ◽  
pp. 117-130 ◽  
Author(s):  
I. K. Lee ◽  
M. R. Coop
Keyword(s):  
Decomposed Granite ◽  
Granite Soil

scholarly journals ROLE OF FINES ON UNDRAINED CYCLIC SHEAR STRENGTH AND RELATIVE DENSITY OF DECOMPOSED GRANITE SOIL "MASADO"

2013 ◽  
Vol 69 (1) ◽  
pp. 70-79
Author(s):  
Woo-Tae KIM ◽  
Masayuki HYODO ◽  
Yukio NAKATA ◽  
Norimasa YOSHIMOTO ◽  
Shohei NODA
Keyword(s):  
Shear Strength ◽  
Relative Density ◽  
Cyclic Shear ◽  
Decomposed Granite ◽  
Granite Soil

Time-based two dimensional modelling of NATM tunnelling

2002 ◽  
Vol 39 (3) ◽  
pp. 710-724 ◽  
Author(s):  
J H Shin ◽  
D M Potts
Keyword(s):  
Three Dimensional ◽  
Two Dimensions ◽  
Time Dependent ◽  
Soil Conditions ◽  
Measuring Instruments ◽  
Two Dimensional ◽  
Time Dependent Behaviour ◽  
Decomposed Granite ◽  
Granite Soil ◽  
Dependent Behaviour

A two dimensional model is commonly employed in practice for the analysis of tunnelling. Such analyses are computationally cheap and are useful for assessing the sensitivity of the problem to the construction method, studying the influence of varying soil conditions, and (or) finding appropriate locations for placing measuring instruments. However, simulating the three dimensional nature of tunnelling in two dimensions requires certain simplifications, including the use of empirical parameters to represent the construction sequence. In many cases the choice of parameter values are arbitrary and often not fully explained. In addition, the modelling methods are often only applicable for undrained or fully drained soil conditions where no time-dependent behaviour is involved during tunnel construction. In this paper an alternative two dimensional approach termed the "time-based modelling method" is proposed that can simulate both the three dimensional effects at the tunnel heading and the time-dependent behaviour during construction. It is proposed that the new approach is appropriate for the analysis of tunnelling in a relatively permeable soil and, as an example, the method is applied to the analysis of a new Austrian tunnelling method (NATM) tunnelling problem in decomposed granite soil. The results are compared with field data and excellent agreement is obtained.Key words: numerical modelling, time-dependent behaviour, NATM tunnelling, decomposed granite soil.

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