Interconnection of karst systems and flow piracy through karst collapse in layered carbonate rocks |
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| Authors: | Haitao Qian Sijing Wang FuZhang Yan Daijiang Yuan |
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| Institution: | (1) Institute of Crustal Dynamics, China Earthquake Administration, P.O. Box 2855, 100085 Beijing, China;(2) Institute of Geology and Geophysics, Chinese Academy of Science, 100029 Beijing, China;(3) State Power Economic Research Institute, 100761 Beijing, China;(4) Institute of Water Conservancy and Hydroelectricity of Guizhou, 550002 Guiyang, China |
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| Abstract: | A new mode of interconnecting karst systems separated by impermeable bed due to karst collapse was discovered in the study
of dam site in Guizhou, South China. Karst flow may be diverted from conduits in one layer to another, thus forming a connected
karst system. Comprehensive methodology and techniques used in the investigation included surface geological surveys, geophysical
investigations, special drilling, and tracer tests. In the stage of preliminary study, the karst conduits were considered
to be developed separately along individual karstified layers. However, further investigation shows that karst collapse may
be associated with conduit and cavern development, damaging the impermeable bed and its watertight function. Accordingly,
a new pattern of karst conduit system was reestablished. The results obtained enable the dam designer to plan a reliable alternative
for seepage protection. |
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