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The Determination of Glacial Till Specific Storage in North Dakota
Author(s) -
Shaver Robert B.
Publication year - 1998
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.1998.tb02828.x
Subject(s) - consolidation (business) , glacial period , volume (thermodynamics) , drilling , geology , geotechnical engineering , mineralogy , materials science , physics , geomorphology , thermodynamics , accounting , metallurgy , business
Specific storage (S s ) was calculated for 107 glacial till core samples collected in 1962 from 93 drilling sites at U.S. Air Force Intercontinental Ballistic Missile launch and launch control facilities located in North Dakota. Core sample depths ranged from 8 to 26 m. Consolidation tests were performed on the till samples using a floating ring consolidometer. The coefficient of volume change (m v ), which is defined as the volume change per unit volume per unit increase in effective stress, was calculated for this study using previously reported consolidation test data. S s calculated for the 107 till samples ranged from 2.0 × 10‐ 4 m‐ 1 to 1.1 × 10‐ 3 m‐ 1 , with a mean value of 5.6 × 0‐ 4 m‐ 1 . Till is easily compressible and, as a result, S s is not constant, but rather a function of loading. With increased depth, effective stress (σ 0 ) increases and S s decreases. Based on data from 107 till cores in this study, the relationship between σ 0 and S s is described by: S s = 0.049σ 0 −0.84 , (r 2 = 0.60, p<0.0001), where σ 0 = in situ effective stress in kPa, and S s = specific storage in m‐ 1 .