Anomalous increases in piezometric levels in advance of longwall mining subsidence

被引:0
|
作者
Booth, CJ [1 ]
Curtiss, AM
Demaris, PJ
Van Roosendaal, DJ
机构
[1] No Illinois Univ, Dept Geol & Environm Geosci, De Kalb, IL 60115 USA
[2] Emcon Inc, Project Geol, Springfield, IL 62703 USA
[3] Illinois State Geol Survey, Champaign, IL 61820 USA
[4] Haley & Aldrich Inc, Boston, MA 02129 USA
来源
ENVIRONMENTAL & ENGINEERING GEOSCIENCE | 1999年 / 5卷 / 04期
关键词
mining; hydrogeology; longwall mining; underground coal mining; piezometric levels; mine subsidence;
D O I
暂无
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The typical initial piezometric response to longwall undermining is a decline in head due to the opening of fractures and bedding planes during early subsidence. However, in studies over two active longwall mines in southern Illinois, temporary rises in head just before subsidence were observed in piezometers constructed in low-permeability units. Although the initial phase of subsidence is considered dilational, these head increases indicate compressional effects that raise pore-water pressures. Possible mechanisms are shear stresses at the leading edge of subsidence or transmission of stress related to dewatering of underlying permeable units.
引用
收藏
页码:407 / 417
页数:11
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