Geological Conditions Influencing Dam Foundations and Stability The safety and durability of a dam largely depend on the geological structure of the foundation on which it is built. Different rock formations, faults, folds, and joints can significantly affect water seepage, stability, and long-term performance. The diagrams (a–f) illustrate various geological scenarios commonly encountered in dam engineering. 1. Rocks Dipping Downstream with an Upstream-Dipping Fault (a) In this case, rock layers slope in the same direction as water flow (downstream), while a fault dips upstream. This condition can be relatively stable because the fault resists sliding toward the downstream side. However, the fault zone may act as a pathway for water seepage, requiring proper sealing and grouting. 2. Upstream-Dipping Soft Sedimentary Layers with Downstream-Dipping Fault (b) This is a more critical situation. Soft sedimentary layers dipping upstream may weaken under water pressure. Additionally, a fault...
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