1 General provisions
1.0.1 This code is formulated in combination with the characteristics of coal industry, the purpose of carrying out the national Law of the People’s Republic of China on Protecting against and Mitigating Earthquake Disasters, implementing the principle of prevention, reasonable seismic precaution, reducing earthquake disaster, avoiding causalities, and reducing economic loss.
1.0.2 This code is applicable to seismic design for projects and facilities of coal mine and preparation plant, which be built, rebuilt and expanded in regions with seismic precautionary intensity 6 and above.
1.0.3 The seismic precautionary intensity shall be defined in accordance with the current National Standard GB18306 Seismic Ground Motion Parameters Zonation Map of China or the documents approved and issued in accordance with the authority granted.The seismic precautionary intensity for mine and coal preparation plant shall be defined according to the location of the industrial site.
1.0.4 The seismic design of mine and preparation plant engineering shall meet the following requirements：
1 Emphasis should be laid on, coordination should be made and post-earthquake recovery should be facilitated.
2 Secondary disasters such as mine flooding, fire hazard and explosion should be prevented during strong earthquakes.
3 The safety of escape passage and its water, electricity and ventilation facilities should be guaranteed.
1.0.5 The new concept and idea of seismic design should be adopted in the course of mine and preparation plant design based on their functions and characteristics.
1.0.6 In addition to the requirements of stipulated in this code, the seismic design of mine and preparation plant engineering also shall comply with those stipulated in the current relevant standards of the nation.
2 Basic requirements
2.1 Seismic precautionary classification
2.1.1 The seismic precautionary category of mine and preparation plant engineering shall meet the following requirements：
1 For engineering related to lifelines whose functions cannot be interrupted during the earthquake or need to be restored as soon as possible after the earthquake, and engineering that during an earthquake may lead to a massive casualties or other major disaster, and that require upgrading the precautionary standards, they shall be classified as major precautionary category (Category B).
2 For engineering with precautions standard other than Category B and D, they shall be classified as standard precautionary category (Category C).
3 For engineering with few personnel and no secondary disasters caused by earthquake, and that are allowed to reduce appropriately the level of seismic precautions as compared with the requirements of basic seismic precautions for this region, they must be classified as appropriate precautionary category (Category D).The seismic precautions shall not be reduced when the seismic precautionary intensity is 6.
2.1.2 The category of seismic precaution for mine and preparation plant engineering shall be determined according to the industry specifics, the casualties, economic losses and difficulty of its recovery, specified inTable 2.1.2.
2.2 Structural system
2.2.1 The structural system of mine and preparation plant engineering shall meet the following requirements：
1 The structural system shall have a clear analysis model and reasonable paths for the transmission of seismic action.
2 The structural system shall have adequate robustness to avoid the loss of seismic capacity due to the failure of structure or components.
3 The structural system shall have necessary seismic capacity, favorable deformation ability and seismic energy dissipation ability.
4 For the weak portions, necessary measures shall be taken to improve seismic capacity.
2.2.2 The structure system of mine and preparation plant engineering should meet the following requirements：
1 Multi-defence seismic energy dissipation subsystems should be determined by the structural system.
2 The structural system should have a reasonable distribution of stiffness and resistance to eliminate the occurrence of weak portions where excessive concentrations of stress or plastic deformation might be produced due to local weakening or abrupt changes.
3 The heavy cantilever structures with heavy self-weighted should not to be used.
4 The structure should have similar dynamic characteristics in the directions of two main axes.
2.2.3 The seismic bearing system of mine and preparation plant engineering shall ensure the integrity and stability of the whole structure and reliably transmit the horizontal seismic action during earthquake.
2.3 Isolation and energy-dissipation
2.3.1 The isolation and energy-dissipation design may be applied to the mine and preparation plant engineering which have higher requirements for seismic safety and needed function.
2.3.2 Mines and coal preparation plant engineering classified as category B for seismic precautions shall conform to the following requirements：
1 When the seismic precautionary intensity is 8, shock isolation, energy dissipation and shock absorption design should be adopted.
2 When the seismic precautionary intensity is 9, shock isolation, energy dissipation and shock absorption design shall be adopted.
2.3.3 The isolation and energy-dissipation shall meet the requirements of the current national standard GB50011 Code for Seismic Design of Buildings.
2.4 Materials and construction
2.4.1 Where special requirements about materials and construction quality, for the construction and installation of seismic structures, water supply and drainage, power supply and distribution facilities and important mechanical equipment, It shall be clearly stated in the design documents.
2.4.2 Special construction methods such as sliding-form construction and large-span construction in mine and coal preparation plant shall be approved by design confirmation before construction.
2.4.3 The property indexes of materials shall meet the current national standard GB50191 Code for Seismic Design of Special Structures.
3 Geotechnical engineering
3.1 General requirements
3.1.1 Where the selection of construction site, the geological structure, topography, engineering geology, hydrogeological conditions and seismic geologic conditions, etc.shall be investigated, mapped, explored and tested, and the impact of earthquake on the construction site shall be preliminarily evaluated.
3.1.2 The geotechnical engineering investigation shall analyze and evaluate the stability and suitability of the construction site for mine construction, and shall divide the construction site into seismic favorable, general, unfavorable or dangerous area, which shall comply with the requirements of the current National standard GB51144 Code for Investigation of Geotechnical Engineering of Mine Construction in CoalIndustry.
3.1.3 For the sites with seismic precautionary intensity 7 and above, the seismic action shall be analyzed and evaluated.For the category B except underground engineering, and category C of large and tall engineering in the 6 as shown in Table 2.1.2, The liquefaction evaluation shall be carried out by 7 degree.
