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The powerhouse of Tapovan Vishnugad Hydropower project (TVHPP) of NTPC is located in the tail of the Great Himalaya range in the Chamoli district, Uttrakhand and is located at +300m depth having adverse geological conditions. The project area is situated near the northern side of MCT around 2.0 Km and lies in the seismic zone V of India. This site encounters a number of rockburst during and after excavation at various places which may be due to the stress redistribution.This paper discusses the designing and primary application of microseismic monitoring technique after post excavation in rocks. A microseismic network has been installed at the powerhouse site of a hydropower project to study the strata conditions and redistribution of stresses after excavation. This paper discusses the microseismic network design based on the existing geological reports, rockburst history, feasibility of drilling and many other parameters. The monitoring system consists of a three dimensional array of sensors, data acquisition unit, cable layout, and an underground laboratory equipped with communication equipment, data acquisition, processing and interpretation software.The primary monitoring period identifies the potential failure zone of rock fracture in the powerhouse by studying different source parameters and provides the information about the stability of the structure. Keywords—Microseismics, rockburst, TVHPP, cavern stability

Microseismics for cavern stability evaluation of a powerhouse structure after excavation