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11.
Chen Jing Vinod Jayan S. Indraratna Buddhima Ngo Ngoc Trung Gao Rui Liu Yangzepeng 《Acta Geotechnica》2022,17(9):3977-3993
Acta Geotechnica - This paper presents the results of Discrete Element Modelling (DEM) which quantitively examine the effect of coal fouling on the deformation and degradation of ballast upon... 相似文献
12.
Shear behaviour of subgrade soil with reference to varying initial shear stress and plasticity index
Silva Isabella Novais Indraratna Buddhima Nguyen Thanh Trung Rujikiatkamjorn Cholachat 《Acta Geotechnica》2022,17(9):4207-4216
Acta Geotechnica - The influence of stress anisotropy (K) (i.e. the ratio between effective horizontal and vertical stresses) on the shear behaviour of soils has received significant attention in... 相似文献
13.
Buddhima Indraratna William C. Glamore Gurudeo A. Tularam 《Geotechnical and Geological Engineering》2002,20(3):181-199
One-way floodgates installed on flood mitigation drains in regions affected by acid sulphate soils restrict carbonate/bicarbonate buffering, thereby creating reservoirs of acid water (pH < 4.5) that discharge during the ebb tide. The drain water quality and hydrodynamic conditions prior to and following floodgate modifications that allowed for controlled saline intrusion are described with reference to data collected from intensively drained and floodgated coastal lowlands located in southeastern New South Wales, Australia. Cl:SO4 ratios taken from groundwater samples depicted an acidic environment with little soil buffering capacity. Prior to modification, water quality upstream of the one-way floodgate was consistently acidic (average pH 4.6) with high concentrations of aluminum and iron that fluctuated with precipitation. Over a two-week period before modifications, floodgate leakage permitted alkaline water to intrude upstream of the floodgate and react with H+ ions. This period showed the strongest supporting field evidence for tidal buffering via modified floodgates. After installing vertical lifting, two-way floodgates average drain water pH increased to 5.89 and aluminum and iron concentrations decreased by more than 30%. A large rainfall (131.8 mm) during the post-modification period caused acidic groundwater flushing, however, in comparison to the pre-modification period, recovery time and average pH were markedly improved. Preliminary investigations of groundwater salinity in response to tidal intrusion has shown that electrical conductivity fluctuates with rainfall and it is predominately limited to 10 m perpendicular to the drain. 相似文献
14.
Determination of Coefficient of Radial Consolidation Using Steepest Tangent Fitting Method 总被引：1，自引：1，他引：0
J. S. Vinod A. Sridharan Buddhima Indraratna 《Geotechnical and Geological Engineering》2010,28(4):533-536
Barron (Trans ASCE 113:718–724, 1948) theoretical relationship between degree of consolidation (U
r
) and time factor (T
r
) is generally used to determine the coefficient of radial consolidation c
r
. Several researchers have proposed different laboratory techniques for obtaining the value of c
r
. However, the usual approach is to compare some salient features of the theoretical U
r
–T
r
relationship with the compression, δ and time, t based on the laboratory data. In this paper, rapid consolidation test procedure originally proposed by Su (J Soil Mech Found
Div Am Soc Civ Eng No. 95: Proc. Pap. 1729 (1–9), 1958) to determine the coefficient of vertical consolidation (c
v
) is extended to evaluate Barron’s coefficient of radial consolidation c
r
for the case of equal strain. The characteristic feature of the proposed method is the identification of the steepest tangent
from the δ–log t plot. The slope of steepest tangent is independent of the drain spacing ratio (n) with a value of 0.847. This approach is rapid, and it predicts more reliable values of c
r
as it is less influenced by the secondary compression. In addition, this method is more versatile and can be applied for
consolidation trends which do not always exhibit the typical S-shape. 相似文献