GB/T 50511-2022 English PDFGB/T 50511: Historical versions
Basic dataStandard ID: GB/T 50511-2022 (GB/T50511-2022)Description (Translated English): (Coal mine shaft engineering construction standards) Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: P70 Classification of International Standard: 73.010 Word Count Estimation: 139,178 Date of Issue: 2022-10-31 Date of Implementation: 2023-02-01 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation Summary: This standard applies to the construction of coal mine shaft engineering. GB/T 50511-2022: (Coal mine shaft engineering construction standards)---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.6 Gas and other harmful gas emission information; 7 Inspection hole inclinometer data (including inclination chart); 8 Drawings of pumping test results in the aquifer section; 9 Comprehensive result map of well logging; 10 Inspection hole survey map and sealing data (including sealing design, sealing report including sealing inspection situation, test data, etc.). 3.2.7 The various formations that the borehole passes through should include the following. 1 Sand layer. particle gradation, natural water content, natural density, specific gravity, porosity, permeability coefficient, internal friction angle. 2 Silt layer. particle gradation, liquid limit, plastic limit, natural water content, natural density, specific gravity, porosity, permeability coefficient, cohesion, internal friction angle. 3 Clay layer. mineral composition analysis, liquid limit, plastic limit, natural water content, natural density, specific gravity, porosity, internal friction angle, cohesion, uniaxial compressive strength, expansion force, expansion amount, free expansion rate. 4 Rock formation. true density, apparent density, porosity, water absorption, water content, natural state compressive strength, saturated state compressive strength, tensile strength, internal friction angle, cohesion, elastic modulus, Poisson's ratio. 5 When the freezing method is used to drill wells, representative formations within the freezing range shall be selected for the following test items, and a special test report shall be submitted. 1) Freezing temperature of soil and rock layers; 2) Specific heat capacity and thermal conductivity of soil and rock layers at 10°C to 25°C and -10°C; 3) Frost heave force and frost heave amount of clay layer at -5°C, -10°C, -15°C; 4) Uniaxial compressive stress-strain curve, uniaxial compressive strength, elastic modulus and Poisson's ratio of frozen soil; 5) Triaxial compressive stress-strain curve, triaxial compressive strength, internal friction angle and cohesion of frozen soil; 6) Uniaxial compression creep performance of frozen soil; 7) Triaxial compression creep performance of frozen soil. 6 Other rock strata and recoverable coal seam measurement items can be determined according to needs. 3.2.8 The mechanical performance tests of frozen soil under different conditions shall comply with the provisions in Table 3.2.8. Table 3.2.8 Mechanical performance tests of frozen soil under different conditions Continued Table 3.2.8 Note. "√" indicates that the test is carried out. 3.2.9 Before roadway construction, the following geological prediction and comprehensive analysis data shall be provided. 1 Geological prediction profile and comparison with geological data in the exploration stage; 2 Pre-analysis of the situation of passing through unstable rock formations and places with large geological structure changes; 3 Possible water gushing points, water gushing volumes and predictions of impact on construction; 4 Prediction of outburst hazards of gas, coal seams and other harmful gases; 5 Prediction of expansive clay, quicksand, bedrock weathered zone and soft rock; 6 Prediction of special conditions such as abandoned lanes, goafs, old kilns, karst caves, and subsidence areas. 3.2.10 For the roadway constructed near the weathered zone, when the outcrop data of the formation is insufficient, supplementary exploration shall be conducted. 3.3 Technical principles of construction preparation 3.3.1 The preparation of construction organization design, construction operation rules and construction technical measures shall meet the following requirements. 1 The construction organization design should be compiled for the single mine project; 2 For important unit projects or unit project combinations with large engineering volume, complex structure and difficult construction, the construction organization design shall be compiled; 3 For unit projects constructed with special or new techniques, the construction organization design shall be compiled; 4 For unit projects and important subdivision projects, construction operation procedures shall be prepared; 5 For general sub-projects or important sub-projects and specific technological processes, construction technical measures should be compiled. 3.3.2 The construction sequence of main shaft and roadway works shall meet the following requirements. 1 The wellbore should be started according to the sequence specified in the total construction period and construction organization design; 2 Shaft shall be formally excavated after the installation of the sealing plate and the hanging of the hanging plate are completed; 3.Shaft shaft should be constructed at one time by using sinking facilities. The skip loading chamber should be constructed at the same time as the shaft, and other chambers, roadways and shaft intersections should be constructed at the same time; 4 When there are multiple shafts in the industrial plaza, two shafts should be arranged to penetrate first; 5.The construction of two or more shaft permanent facilities should be carried out alternately, and the auxiliary shaft should be first followed by the main shaft; when the hoisting system needs to be temporarily modified, the main shaft and air shaft for skip lifting should be modified, and the temporary modification should be carried out alternately; 6 For the construction of the parking lot and chamber at the bottom of the shaft, the roadway or chamber required for construction ventilation, drainage, power supply and transportation should be arranged first; 7 Before the construction of the roadway in the mining area, the permanent ventilation, drainage, power supply and other systems of the mine should be formed; 8 The shaft and roadway engineering should take into account both civil engineering and installation engineering, and the construction sequence should be arranged as a whole. 3.3.3 The layout of ground buildings and facilities shall meet the following requirements. 1 The technological process should be reasonable, the construction work should be fast and smooth, the power facilities should be close to the load center, the machine repair and processing facilities should be close to the stockyard and warehouse, the office and living areas should be arranged separately from the production area, and noise should be avoided and pollution; 2 There should be no less than two exits in the field area, and the roads and light rail railways in the field should not cross at a level; 3 It is advisable to use the permanent gangue field and low-lying land to discharge gangue, and the excavated coal and gangue should be stacked separately; 4.The setting of temporary explosive depots, grease depots and gas stations shall comply with relevant national safety regulations; 5 Temporary facilities should avoid permanent building locations, and permanent building facilities and equipment should be used for construction if conditions permit; 6 For winter construction in severe cold and cold regions, heating and anti-freezing facilities should be installed. 4 Shaft Shaft Ordinary Method Construction4.1 General provisions 4.1.1 The wellbore construction operation mode shall comply with the following regulations. 1.The wellbore construction operation method shall be determined after comparing technical and economic plans according to the wellbore diameter, depth, geological and hydrological conditions and other factors; 2 The wellbore construction should adopt short-section excavation and masonry mixed operation method, and single row or parallel operation method can also be adopted; 3 For the shafts that are temporarily changed before the construction of the vertical shaft and the leveling roadway, below the transportation level, a pit that meets the requirements of the over-discharge distance should be reserved, and the over-discharge distance requirements should comply with the relevant provisions of the current national "Coal Mine Safety Regulations". 4.1.2 The direction way of shaft excavation shall meet the following requirements. 1 When the excavation depth of the shaft is not greater than 300m, laser pointing can be used; 2 When the excavation depth of the shaft is greater than 300m, the excavation can be directed by laser, and the masonry wall should be directed by the vertical line; 3 For shafts with special precision requirements, the excavation and laying shall be directed by the vertical line; 4 When using laser pointing, the laser pointing instrument should be calibrated regularly, the allowable deviation value of excavation is 15mm, and the allowable deviation value of wall laying is 5mm. 4.1.3 The construction arrangement of the chamber connected to the shaft shall meet the following requirements. 1 The measurement, positioning and orientation of the chamber connected to the wellbore should be done well; 2 For the chamber or roadway connected with the shaft, it is advisable to excavate 3m~5m at the same time during the construction of the shaft, and it should be built together with the shaft. 4.1.4 The collection of raw materials for shaft construction shall meet the following requirements. 1 During the wellbore construction, the construction records shall be filled in in detail; 2 During the wellbore construction period, the acceptance records of concealed works shall be made; 3 The wellbore water inflow should be regularly measured and recorded; 4 The qualification certificates and test records of various materials should be complete; 5 There should be original records of engineering excavation quality; 6 The geological column diagram of the wellbore and the vertical and horizontal section diagram of the wellbore excavation shall be surveyed and drawn. 4.1.5 When shaft shaft construction passes through an aquifer with water inflow greater than 10m³/h, water control measures such as grouting and water blocking should be taken. 4.2 Lock construction 4.2.1 The wellbore lock should be permanently locked, and the permanent well wall should be avoided when the temporary lock is used. 4.2.2 Shaft lock support shall meet the following requirements. 1 When constructing shaft locks, it is advisable to excavate 3m to 5m chambers connected to the shaft, such as wind tunnels, safety exits, and pipelines, and the joints with the shaft should be poured as a whole; Safety protection measures such as anti-collapse sand and anti-fall; 2 Temporary locks should adopt plain concrete structure. 4.2.3 For wellbore locks located in soft topsoil, measures to prevent subsidence should be taken. 4.2.4 Before the temporary lock is removed, a protection plate shall be installed under the lock to meet the requirements of ventilation, anti-drop and load bearing. 4.3 Alluvium construction 4.3.1 The layout of wellhead facilities for alluvium construction shall meet the following requirements. 1 Before the construction of the alluvial layer, the wellbore should be well locked, and a temporary sealing plate should be installed, and the strength of the sealing plate should meet the construction safety requirements; 2 In the initial stage of alluvial layer construction, lifting facilities should be used to get on and off personnel, and temporary ladders should be set up in the well; 3 When the depth of the well is greater than 20m, the working hanging pan should be hung and the hoisting guide tank rope should be installed. 4.3.2 The excavation of the alluvium section shall meet the following requirements. 1 The alluvial layer should be excavated in short sections, and the excavator should be used for excavation. After the lifting and hanging system is formed, the excavator should be used to excavate and excavate with the central rotary rock grab machine; 2 Special formations such as gravel should be constructed by drilling and blasting method, and safety protection measures should be taken to prevent blasting and wellhead facilities from collapsing; 3 When the alluvial layer is constructed by the common method, drainage measures shall be taken according to the hydrogeological conditions of the wellbore. 4.3.3 Alluvial section support shall meet the following requirements. 1 According to the stability of the stratum and the side of the well, determine a reasonable excavation section height, and reliable temporary support measures such as anchor net spraying or hanging well ring backboard can be used; 2 The height of the temporary support section should not be greater than 2m; 3 Permanent support should be carried out in time. 4.3.4 The observation of settlement deformation shall meet the following requirements. 1 During the construction of the wellbore in the alluvial layer section, the surface subsidence and the displacement and deformation of the wellbore and ground facilities should be observed regularly through the observation points established in advance; 2 When displacement and deformation endanger construction safety, reinforcement measures shall be taken in time. 4.4 Bedrock Excavation 4.4.1 Blast hole drilling shall meet the following requirements. 1 For bedrock excavation, the drilling and blasting method should be adopted except for the rock formations that are too loose and broken; when the diameter of the well is greater than 5m, an umbrella drill frame should be used for drilling; when the diameter of the well is less than 5m, a hand-held pneumatic rock drill can be used for drilling; 2 The residue on the working face should be removed before drilling; 3 Use measuring tools to determine the diameter of the blasthole circle and the position of each circle of blasthole; 4 Each circle of blast holes should be drilled to the same horizontal position, and the depth of the cut holes should be increased as required; 5.When drilling, avoid remnant holes and cracks in the rock formation; seal the opening of each blasthole after drilling, and use compressed air to remove rock powder and sewage in the blasthole before charging. 4.4.2 The blasting operation shall comply with the following regulations. 1 The depth and arrangement of blastholes shall be determined according to lithology and operation mode. The depth of holes for short-section excavation and masonry mixed operations should be 3.5m to 5.0m; The eye depth for multi-circulation operations should be 1.2m to 2.0m. 2 It is advisable to use water-gel explosives and emulsion explosives with high power and good waterproof performance in coal mines for smooth blasting. 3 The construction operation rules shall be compiled, and the blasting chart shall be adjusted in due course according to the lithology changes. 4 The selection of smooth blasting parameters shall meet the following requirements. 1) The eye distance of the peripheral eyes should be controlled within 0.4m to 0.6m. 2) For the wellbore where conditions permit, small blastholes and small cartridges should be used for the peripheral holes, and the diameter of the cartridge should be less than 35mm. 3) The charge per unit length of the peripheral eye. when the uniaxial saturated compressive strength of the rock is less than 30MPa, 2 5 When the shaft is excavated, the stray current in the shaft should be monitored; when the current exceeds 30mA, the following measures should be taken. 1) Check the grounding quality of electrical equipment; 2) The blasting wire must not be damaged or have exposed joints; 3) Use a detonator that resists stray current. 4.4.3 Rock loading operations shall meet the following requirements. 1 The rock-loading equipment should use the center rotary rock grab. When the conditions are limited, the long rope suspension rock grab can be used. 2 The wellbore with a diameter greater than 6.5m should be equipped with two rock loading equipment, and can also be equipped with a small explosion-proof excavator for bottom cleaning. 3 The suspension of the rock grab should meet the following requirements. 1) The rock grabbing machine should be reliably connected with the hanging pan, and a special safety rope should be set, and the fixing device of the hanging pan should be firmly supported with the well wall; 2) The long-rope suspended rock grab should be suspended by a special drilling winch and arranged close to the center of the wellbore. The suspension winch should be equipped with a locking device. 4.4.4 Temporary support shall meet the following requirements. 1 Bolt and shotcrete support may be used for temporary wellbore support, and its section height, thickness and structure may be adopted according to Table 4.4.4. Table 4.4.4 Segment height, thickness and structure of anchor shotcrete support 2 When the wellbore is excavated in various rock formations, the height of the unsupported section shall meet the following requirements. 1) For Type I rock strata, it can be determined by the construction unit; 2) For rock formations of type II and III, it should not exceed 4m. When the height exceeds 2m and there are dangerous rocks, anti-splitting measures such as installing anchor rods or anchor nets should be taken; 3) For rock formations of types Ⅳ and Ⅴ, it should not exceed 2m. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 50511-2022_English be delivered?Answer: Upon your order, we will start to translate GB/T 50511-2022_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. 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