標題: Estimating coefficients of volume compressibility from compression of strata and piezometric changes in a multiaquifer system in west Taiwan
作者: Liu, CH
Pan, YW
Liao, JJ
Hung, WC
土木工程學系
防災與水環境研究中心
Department of Civil Engineering
Disaster Prevention and Water Environment Research Center
關鍵字: land subsidence;groundwater;multilevel monitoring well;coefficient of volume compressibility;the Choshui River alluvial fan;GpS
公開日期: 1-Sep-2004
摘要: This paper estimates the coefficients of volume compressibility from variation in compressible! layer thickness and changes in piezometric heads by using detail ground surface surveys and a multilayer monitoring well at a selected site (Shigang) within the Choshui River alluvial fan in west Taiwan. The paper integrates various types of in situ monitoring tools, including leveling surveys, continuous global position system (GPS) stations, multilevel layer compression and groundwater pressure head-monitoring wells, to investigate the situation and progress of the subsidence problem in the region. The results from the cross-analyses of the measured data show that surface settlement caused by the compression of strata is between the depths of 60 and 210 m where the clayey stratum within 120-180 m was most pronounced and contributes up to 53% of the total compression. The results indicate that the clayey stratum is under normal consolidation. The results also reflect the fact that 20% of settlement contribution comes from the sandy stratum within 90-120 m; the elasto-plastic behavior of this sandy stratum is clear. The coefficients of volume compressibility of the clayey and sandy stratum analysed from the stratum's compression records; they were 6.38 x 10(-8) and 5.71 x 10(-9) m(2)/N, respectively. Ultimately, this parameter estimation would permit to control and predict land subsidence based on change in pressure head which are related to groundwater extraction. (C) 2004 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.enggeo.2004.04.007
http://hdl.handle.net/11536/26437
ISSN: 0013-7952
DOI: 10.1016/j.enggeo.2004.04.007
期刊: ENGINEERING GEOLOGY
Volume: 75
Issue: 1
起始頁: 33
結束頁: 47
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