Abstract: Stope rockmass structural plane distribution is one of the important indexes to evaluate the stability of stope and its surrounding rock mass. Therefore, in this paper, the 3-D digital measurement system (ShapeMetrix 3D) is employed to survey and collect the digital information of the parameters of rockmass structures plane that include rock mass occurrence, joint set number, joint spacing, liner density of structural plane etc of -630m stage stope at Xincheng Gold Mine. Based on the digital joint structure characteristics, the Q-system and RMR system are employed to analyze and classify the stability of stope rockmass, combining geostress measurement result and rock mechanics parameters. The stability of stopes is analyzed by using the Q-system and RMR-system. Assessments are conducted at the hanging wall, orebody and footwall of different stopes. By contrasting the assessing results of two kinds of rock mass rating system, the hanging wall and orebody have poor Q and RMR values, and the foot wall has fair conditions, which indicates the fair or poor stope stability. The stability analyzing method is very effective to assess the stope stability at Xincheng Gold Mine and it provides the reliable basic data for choosing the right stope structure parameters and roof supporting forms.

Key words: photographic surveying, rockmass structural plane, stope stability, Q system, RMR system