Effects of tunneling on groundwater flow and swelling of clay‐sulfate rocks
作者： Christoph Butscher , Herbert H. Einstein , Peter Huggenberger
DOI: 10.1029/2011WR011023
关键词: Sulfate 、 Anhydrite 、 Excavation 、 Groundwater model 、 Hydrogeology 、 Groundwater flow 、 Inflow 、 Geology 、 Gypsum 、 Geotechnical engineering
摘要: [1] Swelling of clay-sulfate rocks is a major threat in tunneling. It triggered by the transformation sulfate mineral anhydrite into gypsum as result water inflow anhydrite-containing layers after tunnel excavation. The present study investigates hydraulic effects tunneling on groundwater flow and analyzes how changes caused excavation lead to area. Numerical models are used conduct scenario simulations that allow one relate hydrogeological conditions rock swelling. influence topographic setting, excavation-damaged zone around tunnel, sealing effect liner, geological configuration analyzed separately. analysis performed for synthetic situations complemented case from Switzerland. results illustrate importance information when assessing risk swelling at an actual site.
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