Method for quantitatively evaluating surrounding rock stability of ultra-large underground cavern group in construction period

The invention relates to a method for monitoring the surrounding rock stability of an ultra-large underground cavern group in a construction period, in particular to a method for monitoring the surrounding rock stability of an ultra-large underground cavern group and used in a hydropower station construction period. The method includes the following steps: collecting geological parameters of surrounding rock through various geological collection methods, judging whether the geology of the surrounding rock is instable remarkably according to the collected geological parameters, processing the collected geological parameter information on yes judgment and grading the processed data with each grade of data corresponding to the preset stability degree judging value. The method for effectively and quantitatively evaluating the surrounding rock stability of the ultra-large underground cavern group in the construction period has the advantages of being capable of acquiring directly-perceived accurate stability judgment data and favorable for stabilizing the surrounding rock, ensuring construction safety and guaranteeing smooth engineering construction and long-term safe stable operation. The method is especially suitable for monitoring the surrounding rock stability of the ultra-large underground cavern group in the construction period.