Estimating coefficients of volume compressibility from compression of strata and piezometric changes in a multiaquifer system in west Taiwan
Estimating coefficients of volume compressibility from compression of strata and piezometric changes in a multiaquifer system in west Taiwan
复制标题
DOI：
10.1016/j.enggeo.2004.04.007
复制
发表时间：
2004-09
影响因子：
7.4
通讯作者：
Chih-Hsi Liu;Yii‐Wen Pan;J. Liao;Wei Nung Hung
中科院分区：
文献类型：
--
作者：
Chih-Hsi Liu;Yii‐Wen Pan;J. Liao;Wei Nung Hung
本文利用详细的地表调查和台湾西部长水河冲积扇内选定地点（石岗）的多层监测井，根据可压缩层厚度的变化和测压水头的变化来估计体积压缩系数。该文综合利用水准测量、连续全球定位系统（GPS）站、多层压缩和地下水压力水头监测井等多种现场监测工具，调查该地区沉降问题的现状和进展。实测数据交叉分析结果表明，地层压缩引起的地表沉降发生在60~210 m深度，其中120~180 m的粘土地层最为明显，占总压缩量的53%。结果表明，粘土地层处于正常固结状态。结果还反映出20%的沉降贡献来自于90~120 m范围内的沙地层；该沙地层的弹塑性行为很明显。根据地层压缩记录分析粘土质和砂质地层的体积压缩系数；它们分别为 6.38×10−8 和 5.71×10−9m2/N。最终，该参数估计将允许根据与地下水抽取相关的压头变化来控制和预测地面沉降。
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 6.38×10−8and 5.71×10−9m2/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.