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2 The stability evaluation of the roadway engineering should adopt the combination of engineering geological analysis and numerical analysis. Under the condition that the basic data of engineering stability evaluation is insufficient, the stability of engineering rock mass can be judged.
Table underground engineering rock mass self-stability
Note: 1 The landslide height is less than 3m or the landslide volume is less than 30m 3 , which is a small landslide; Basic rock mass
Quality level Self-stability I Span ≤20m , long-term stability, occasional block, no landslide II The span is 10m ~ 20m , which can be basically stable, and partial or small collapse can occur.
Span less than 10m , can be stable for a long time, occasionally falling off III The span is 10m ~ 20m , which can be stable for several days to January , and small to medium collapse can occur.
The span is 5m ~ 10m , which can be stable for several months. Local block displacement and small to medium collapse can occur.
The span is less than 5m , which is basically stable IV The span is more than 5m , and there is no self-stability. Within a few days to several months, loose deformation and small collapse can occur, and then it will develop into a medium-to-large collapse.
square. When the depth is buried, the main part is loose and the main part is buried. When the depth is large, there is obvious plastic flow deformation and crushing damage. The span is small.
At 5m , it can be stable for several days to January . V No self-stability
2 The height of the collapse is 3m ~ 6m or the volume of the collapse is 30m 3 ~ 100m 3 , which is the middle collapse;
3 The landslide height is greater than 6m or the landslide volume is greater than 100m 3 , which is a large collapse.
3 The method for evaluating the stability of stope and goaf should be based on engineering analogy and numerical analysis. Under the condition that the basic information of the project stability evaluation is insufficient, the stability of the rock mass in the stope and goaf should be judged according to Table 6.3.2 . The stability evaluation of the stope should include the following:
(1) Determine the factors affecting the stability of the stope;
(2) the impact of mining on regional stability;
(3) Optimization of the structure parameters of the stope;
(4) Optimization of mining sequence;
(5) The extent of disturbance to the surface of the mining.
The collapsibility of ore in the stope should be evaluated according to the ore body geometry, structural surface geometric parameters, structural surface features, ore rock physical and mechanical properties, original rock stress state, stope structural parameters, groundwater conditions, and induced modes. The evaluation method should adopt MRMR empirical chart method and numerical analysis method.
5 Mining under the steep slope mountain, evaluate the geological disasters such as rolling stones and landslides that may be induced, and propose corresponding control plans or reasons for not being able to mine.
1 The design of the roadway engineering should be based on the integrity of the rock mass, the physical and mechanical properties of the rock, the distribution of groundwater and ground stress, and other factors.