Shares of GVK Power & Infrastructure were locked in the 5 per cent upper circuit for the eight day at Rs 10.84 on the BSE on Tuesday.In comparison, the S&P BSE Sensex was down 0.21 per cent at 65,884.The stock of civil construction company was quoting at its highest level since September 2018.A combined 9.6 million equity shares had changed hands on the BSE and NSE. There were pending buy orders for a combined 5.7 million on these exchanges, data shows.In the past one month, it has zoomed 146 per cent from a level of Rs 4.41. It has skyrocketed 447 per cent from its 52-week low price of Rs 1.98 touched on March 29.On increase in volume, GVK Power on Monday clarified that there are no events, information, etc., that have a bearing on the operation/performance of the company,