Abstract: Grouting works are underground concealed works, and their geological conditions and different rock properties constrain the actual site construction technology, and influence the optimal design of dam anti-seepage curtain. The lack of analysis of geological conditions will bring a lot of uncertainty to the grouting engineering. Prediction of geological condition is well studied presently in tunnel excavation, but not the geological factors in grouting engineering. Based on the example of dam anti-seepage grouting curtain at the Wudongde hydropower station, the authors analyzed and studied the geological factors such as karst, breccia, fault, large structural plane, and the large intersection angle between the curtain and terrane strike. According to the characteristics of different geological factors, the authors put forward a series of treatment measures such as thick slurry backfilling, deepening and encryption of grouting hole, dynamic adjustment of grouting pressure and material. The study can reduce cognitive blindness of geological conditions, and provide necessary support for curtain grouting optimization.

Key words: grouting engineering, anti-seepage curtain, geological factors, treatment measures, Wudongde hydropower station