1 The determination of the rock movement angle shall comply with the following provisions:
    (1) The rock movement angle of large mines should be determined by numerical analysis and analogy method;
    (2) The rock movement angle of small and medium-sized mines can be selected based on the analysis of the lithological structural characteristics and the actual data analogy of similar mines;
    (3) For the reconstruction or expansion of the mine, the original design rock movement angle should be corrected according to the obtained rock movement observation data and the change of the geological conditions of the deposit.
    2 The circle of rock movement range shall meet the following requirements: (1) The rock movement range shall be delineated by the deepest part of the mining body, and the ore body that has not yet been explored in the deep part shall be delineated from the part that can be exploited as a prospect;
    (2) The mining depth is large and the service period is long. The mines with staged mining can be used to delineate the rock movement range;
    (3) If there is a small dip weak surface in the adjacent rock stratum in the same direction as the moving angle, and the influence range exceeds the range delineated by the complete rock stratum, it should be corrected by the influence range of the weak surface;
    (4) The delineated rock movement range and the remaining security pillars shall be marked on the general plan, the development system plan, the section plan and the stage plan.
    3 The main construction and structures of the surface shall be arranged outside the protection zone of the rock movement range. For special reasons, it shall be placed in the protection zone of the rock movement range, and the security pillar shall be reserved.
    4 The degree of protection of the surface construction and structures and the width of the protective belt shall comply with the following provisions:
    (1) The classification of the protection of surface construction and structures shall comply with the provisions of Table 4-1 ;
    (2) The width of the protective cover of the surface construction and structures shall not be less than that specified in Table 4-2 .
Table 4-1 Classification of protection levels of surface structures and structures
Table 4-2 Width of protective belts for surface structures and structures
Note: It is counted from the outer edge of buildings and structures.
    (1) The rock movement angle of large mines should be determined by numerical analysis and analogy method;
    (2) The rock movement angle of small and medium-sized mines can be selected based on the analysis of the lithological structural characteristics and the actual data analogy of similar mines;
    (3) For the reconstruction or expansion of the mine, the original design rock movement angle should be corrected according to the obtained rock movement observation data and the change of the geological conditions of the deposit.
    2 The circle of rock movement range shall meet the following requirements: (1) The rock movement range shall be delineated by the deepest part of the mining body, and the ore body that has not yet been explored in the deep part shall be delineated from the part that can be exploited as a prospect;
    (2) The mining depth is large and the service period is long. The mines with staged mining can be used to delineate the rock movement range;
    (3) If there is a small dip weak surface in the adjacent rock stratum in the same direction as the moving angle, and the influence range exceeds the range delineated by the complete rock stratum, it should be corrected by the influence range of the weak surface;
    (4) The delineated rock movement range and the remaining security pillars shall be marked on the general plan, the development system plan, the section plan and the stage plan.
    3 The main construction and structures of the surface shall be arranged outside the protection zone of the rock movement range. For special reasons, it shall be placed in the protection zone of the rock movement range, and the security pillar shall be reserved.
    4 The degree of protection of the surface construction and structures and the width of the protective belt shall comply with the following provisions:
    (1) The classification of the protection of surface construction and structures shall comply with the provisions of Table 4-1 ;
    (2) The width of the protective cover of the surface construction and structures shall not be less than that specified in Table 4-2 .
Table 4-1 Classification of protection levels of surface structures and structures
| Protection level | Main buildings and structures |
| I | State Department explicitly protect the cultural relics, monuments; first-class train station, power plant main plant, there are two in the same span Large heavy-duty overhead crane factory, open-hearth furnace, cement kiln, large-scale beneficiation plant and other factory owners particularly important or particularly sensitive, After mining could lead to major production and casualty built structures; cast iron gas pipe lines, highways, airports Runway, high-rise residential, vertical (oblique) well, main flat, lift room, main ventilation room, air compressor room, etc. |
| II | Blast furnace, coking furnace, 220kV and above ultra-high voltage transmission line tower, mining area total substation, overpass, high frequency communication Line cable; industrial plant with reinforced concrete frame structure, industrial plant with bridge crane, railway mine warehouse, total machine repair plant More important large industrial buildings and structures; office buildings, hospitals, theaters, schools, department stores, second-class train stations, Two-story buildings and three-story residential buildings with a length of more than 20m ; water mains and cast iron gas pipelines; aerial ropeways, electricity Sight tower and its relay tower, first-class highway, etc. |
| III | Brick and wood structure industrial plant without crane equipment, third and fourth railway stations, small brick or brick-concrete structure or small deformation section In a two-story building of 20m , village brick and tile houses; high-voltage transmission line towers, steel gas pipes, etc. |
| IV | Rural wooden structure load-bearing houses, simple warehouses, etc. |
Table 4-2 Width of protective belts for surface structures and structures
| Protection level | Protective tape width ( m ) |
| I | 20 |
| II | 15 |
| III | 10 |
| IV | 5 |
Note: It is counted from the outer edge of buildings and structures.
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