What does the mine hydrogeological zoning report include?

The complex hydrogeological conditions of coal mines in China have great influence on the safety production of coal mines. There have been many water disasters in history, which have caused serious economic losses and casualties. For the sake of safe production in coal mines and targeted prevention and control of mine water, Article 12 of the Regulations on Water Prevention and Control in Coal Mines stipulates that all coal mines must prepare a classification report of mine hydrogeological types to determine mine hydrogeological types. Coal mining enterprises and mines shall formulate plans and measures for water prevention and control according to the determined hydrogeological types, and seriously organize their implementation. The chief engineer of a coal mine enterprise is responsible for organizing the examination and approval of the report on the classification of mine hydrogeological types and determining the types.

The Report on Classification of Mine Hydrogeological Types should be compiled on the basis of systematic arrangement and comprehensive analysis of hydrogeological data at various stages of deposit exploration and mine construction and production. At least seven contents of this regulation shall be included.

A, mine and mine site investigation

(a) the basic situation of mine waida. General situation of coal mine development, including mine production years, designed annual production capacity and current actual output; Mine development mode, production level and main mining coal seams.

(2) Location and transportation. The location, administrative subordination, geographical coordinates, length, width, area, boundary and adjacent relationship of the mine field are summarized. Traffic trunk lines such as railways, highways and waterways passing through the mining area or nearby towns, and the distance from the nearest station, wharf and airport to the mining area. Attached is the traffic location map of the mining area.

③ Topography. Summarize the main features, types, absolute and relative heights, overall topography and representative positions, such as wellhead and elevation of main buildings in industrial sites. Minimum erosion datum of major rivers.

(4) Meteorology and hydrology. This paper summarizes the development of surface water bodies in the mining area and its adjacent areas, including rivers, lakes, reservoirs, ditches, pits and ponds. The river system should be pointed out, and its average, maximum, minimum flow and historical maximum flood level should be explained respectively according to the data of hydrological stations. Lakes, reservoirs, etc. Their distribution range and area should be pointed out.

Explain the climate zone of the mining area. According to the data of meteorological stations in this area and its adjacent areas, the distribution of precipitation in this area is given, including the annual average precipitation, the maximum and minimum precipitation and the months in which precipitation is concentrated. It should also point out the average annual evaporation and the maximum annual evaporation; Maximum and minimum temperatures; Average relative humidity; Maximum frozen soil depth; Annual average air pressure, etc. When the information is complete, a summary table of meteorological data or curves of monthly average precipitation, steam quantity, relative humidity and temperature shall be attached (insert tables and illustrations).

⑤ Earthquake. Summarize the frequency, maximum magnitude and earthquake intensity of earthquakes in history.

(six) the current situation of mine drainage facilities. Summarize the underground horizontal drainage facilities, including the volume of water storage tanks, the model and quantity of drainage pumps; Diameter and number of drainage pipes; Maximum underground drainage capacity; Whether it has the ability to resist disasters; Whether it meets the requirements of hydrophobic depressurization.

II. Review of Geological and Hydrogeological Work in the Early Stage

According to the different stages of general survey, detailed investigation, exploration, well construction and mine production or reconstruction and expansion, the completed geological and hydrogeological work results are classified and summarized, and the names and completion times of various reports are pointed out.

(a) Review the results of geological and hydrogeological work in pre-investigation, general survey, detailed investigation and exploration. Summarize the "report" or important drawings in chronological order (from old to new), including the completion year, completion unit, main contents and conclusions of the report.

(2) Review of seismic exploration and other geophysical exploration in mining areas. Its main contents include completion unit, exploration time, exploration scope, survey line length and physical point density. This paper summarizes the main geological and hydrogeological achievements of geophysical exploration, especially the control of seismic exploration on various structures.

(3) opinions on supplementary hydrogeological exploration, test, research data or special reports during mine construction, development, mining, expansion and reconstruction. Summarize the completion time, completion unit and main contents of hydrogeological work results (reports). The main hydrogeological problems existing in the mining area are expounded in detail, and the previous hydrogeological and water prevention work is comprehensively reviewed.

Three. geological survey

① stratum. According to the hydrogeological unit (or groundwater system) where the mine field is located, the strata with developed outreach are described in the order from old to new. Some series strata can be subdivided according to series and group. Description mainly includes: thickness, lithology, distribution and burial conditions; The description of coal measures, minable seams and reserves includes coal measures strata and main minable seams.

2 structure. According to the division of China Geotectonics Outline, the subordinate relationship of geological structure is given. The fold structures are described one by one, including anticline, syncline, monocline, graben and horst. For anticlines and synclines, the axial direction and attitude should be given. The fault structures in this area are described in detail, including the number, number, distribution direction, dip angle, tendency, nature, drop and extension length of faults. Attached is a fault development list and structural outline map.

③ Magmatic rocks. Describe the age, lithology, occurrence and distribution of magmatic rocks in the mine field and their relationship with coal seams and main aquifers.

Four. regional hydrogeology

Mainly describe the name, scope and boundary of hydrogeological unit or groundwater system where the mining area is located; Conditions for recharge, runoff and discharge of groundwater; Strong runoff zone and flow distribution law of karst springs. In particular, it is necessary to point out the specific location of the groundwater system where the mining area is located. Attached is a schematic diagram of hydrogeological unit or groundwater system where the mining area is located.

Five, mine hydrogeology

① mine field boundary and its hydraulic properties. Describe the composition of the boundary around the mine, usually referring to faults, hidden outcrops, igneous rocks and artificial boundaries. Analyze the hydraulic connection between the aquifer and the aquifer outside the mining area that may be caused by the boundary.

② Aquifer. Describe aquifers one by one in the order from new to old. Its contents mainly include: the name, occurrence, distribution, thickness (maximum, minimum and average thickness), lithology and its changing law in vertical and horizontal directions; Groundwater level elevation, unit water inflow and permeability coefficient; Hydrochemical type, salinity, total hardness, etc.

The source of groundwater recharge in aquifer and its hydraulic connection with other aquifers are pointed out. Karst fractured aquifer should also point out karst development, borehole water inflow, mud consumption and unit water absorption. In particular, the existence and development of karst collapse columns should be pointed out. Attached are isoline maps of main water-filled aquifers, etc.

③ Aquifer. Describe one by one according to the order from new to old, focusing on the water-resisting layer that constitutes the roof and floor of coal seam. Its contents mainly include: lithology, distribution, thickness (maximum, minimum and average thickness) and its changing law, physical and mechanical indexes, and information related to blocking the hydraulic connection between atmospheric precipitation, surface water and aquifer.

(4) Mine water filling conditions. Mine water filling conditions mainly refer to water filling source, water filling channel and water filling intensity. Water filling source refers to the source of mine water; Water-filled channel refers to the channel through which water enters the mine. Describe and list all kinds of possible water filling sources in detail, such as atmospheric precipitation, surface water, old kiln water and groundwater, and possible water filling channels, such as fault and fracture dense zones, collapse columns, channels formed by the destruction of coal seam roof and floor, unclogged and poorly blocked drilling holes and karst collapse.

(5) The distribution of old kiln water in the mine field and surrounding areas. Describe in detail the distribution of old kiln water in the mine field and its surrounding areas, including location, water accumulation range and volume, head pressure and the connection with other water sources. Conduct special research when necessary.

(6) Mine water filling condition. Investigate the underground water inrush point, describe the location of the water inrush point, the change law of water quantity and water quality, and the treatment of the water inrush point. Statistically analyze the maximum water inflow and normal water inflow of the mine. Water inflow includes residual water in shaft, water inflow in roadway, water inflow in working face and water inflow in goaf, etc.

Six, evaluate the degree of mine mining affected by water disasters and the difficulty of water prevention and control work.

(a) the evaluation of the degree of mine mining affected by water disasters. According to the contents listed in Table 2-1 of the Regulations on Water Prevention and Control in Coal Mines, the influence of water disasters on mine production is evaluated and classified.

(2) Evaluation on the difficulty of mine water prevention and control. The difficulty of mine water prevention and control is evaluated from both technical and economic aspects.

Seven, the classification of mine hydrogeological types and suggestions for water prevention and control.

(1) Classification of mine hydrogeological types. According to Table 2-1 of the Regulations on Water Prevention and Control in Coal Mines, the mining of different coal seams can be divided into mine hydrogeological types according to the nature of aquifer damaged or affected by mining, recharge conditions, water abundance, water distribution in mines and surrounding old kilns, water inflow and water inrush in mines, the degree of water damage and the difficulty of water prevention and control. The hydrogeological types of different coal seams in the same mining area can be different.

(2) Suggestions on water control. This paper expounds the main water disaster problems existing in the mine and the water prevention measures that should be taken.