The microfabric of a chemically weathered granite

1978 ◽  
Vol 18 (1) ◽  
pp. 91-100 ◽  
Author(s):  
J. Baynes ◽  
W. R. Dearman
Keyword(s):  
Weathered Granite

scholarly journals Application Ranges of EPB Shield TBM in Weathered Granite Soil: A Laboratory Scale Study

2021 ◽  
Vol 11 (7) ◽  
pp. 2995
Author(s):  
Tae-Hwan Kim ◽  
In-Mo Lee ◽  
Hee-Young Chung ◽  
Jeong-Jun Park ◽  
Young-Moo Ryu
Keyword(s):  
Water Content ◽  
Upper And Lower Bounds ◽  
Shield Tunnel ◽  
Particle Crushing ◽  
Pressure Balance ◽  
Soil Conditioning ◽  
Weathered Granite ◽  
Weathered Granite Soil ◽  
Granite Soil ◽  
Epb Shield

Soil conditioning is a key factor in increasing tunnel face stability and extraction efficiency of excavated soil when excavating tunnels using an earth pressure balance (EPB) shield tunnel boring machine (TBM). Weathered granite soil, which is abundant in the Korean Peninsula (also in Japan, Hong Kong, and Singapore), has different characteristics than sand and clay; it also has particle-crushing characteristics. Conditioning agents were mixed with weathered granite soils of different individual particle-size gradations, and three characteristics (workability, permeability, and compressibility) were evaluated to find an optimal conditioning method. The lower and upper bounds of the water content that are needed for a well-functioning EPB shield TBM were also proposed. Through a trial-and-error experimental analysis, it was confirmed that soil conditioning using foam only was possible when the water content was controlled within the allowable range, that is, between the upper and lower bounds; when water content exceeded the upper bound, soil conditioning with solidification agents was needed along with foam. By taking advantage of the particle-crushing characteristics of the weathered granite soil, it was feasible to adopt the EPB shield TBM even when the soil was extremely coarse and cohesionless by conditioning with polymer slurries along with foam. Finally, the application ranges of EPB shield TBM in weathered granite soil were proposed; the newly proposed ranges are wider and expanded to coarser zones compared with those proposed so far.

In-situ loading tests using the large-sized concrete block for weathered granite

2020 ◽  
pp. 191-198
Author(s):  
Ryunoshin Yoshinaka ◽  
Takeo Endo ◽  
Naoshige Nomura ◽  
Kazuhiko Yamagishi
Keyword(s):  
Concrete Block ◽  
Weathered Granite ◽  
Loading Tests

scholarly journals A Study on Characteristics of Fine Particle Distribution at Cut Slope and Fill Slope Comprising Weathered Granite

2018 ◽  
Vol 67 (3) ◽  
pp. 346-353 ◽  
Author(s):  
Hiroyasu OHTSU ◽  
Pipatpongsa THIRAPONG ◽  
Takafumi KITAOKA ◽  
Shunichiro ITO ◽  
Mitsuru YABE ◽  
...  
Keyword(s):  
Fine Particle ◽  
Particle Distribution ◽  
Cut Slope ◽  
Weathered Granite ◽  
Fill Slope

Weathering and Subsurface Erosion in Granite at The Piedmont Angle, Balos, Sudan

1958 ◽  
Vol 95 (5) ◽  
pp. 353-377 ◽  
Author(s):  
B. P. Ruxton
Keyword(s):  
Surface Water ◽  
Heavy Rain ◽  
Dry Season ◽  
Surface Erosion ◽  
Weathered Granite

AbstractSub-surface erosion is intensely active in weathered granite debris at the scarp foot of Jebel Qasim. Powerful flushes of sub-surface water after heavy rain remove much of the decomposing feldspar partly by solution and partly by mechanical eluviation. The sedentary debris gradually contracts as the feldspar is removed and when removal is nearing completion the debris may become compacted. The compacted debris occupies less than 40 per cent by volume of the granite from which it was derived.The upper fringing pediment around this hill is mantled by moist incoherent debris holding small local pockets of water which persist throughout the dry season. Annual recharge of this sub-surface water ensures intense weathering in the debris.The combination of intense weathering and sub-surface erosion with ensuing contraction of the debris occurring just below the piedmont angle may be sufficient to explain the maintenance of this angle during slope retreat.

scholarly journals Deformation and failure characteristics of weathered granite under uniaxial compression

AIP Advances ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 075222 ◽  
Author(s):  
Lingfan Zhang ◽  
Duoxing Yang ◽  
Zhonghui Chen
Keyword(s):  
Uniaxial Compression ◽  
Failure Characteristics ◽  
Deformation And Failure ◽  
Weathered Granite
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