216 results about "Coal measures" patented technology

The invention discloses a simulation test system and monitoring method for a disaster of roof water burst and sand inrush induced by coal seam mining. The simulation test system comprises a bracket, wherein a test bin is arranged inside the bracket; a movable coal-mining simulating dragging plate is arranged at the bottom of the test bin; a water-sand gathering channel obliquely arranged is arranged below the coal-mining simulating dragging plate; a water-sand collecting device is arranged at the outlet of the water-sand gathering channel; the test bin is formed by a bottom plate, a right side wall, a front transparent plate body, a back transparent plate body and the coal-mining simulating dragging plate; a plurality of pore water pressure sensors and a plurality of pressure sensors are arranged inside the test bin. According to the invention, the simulation test for the disaster of the roof water burst and sand inrush induced by coal seam mining is carried out by adopting the technical scheme that the test bin is filled with coal measure strata simulating materials, so as to obtain water-sand inrush parameters of different stratum combinations, therefore, the identification degree of the characteristics of the disaster of operating face water burst and sand inrush induced by coal seam mining is improved.

The invention relates to a concrete admixture, in particular to a composite cement preservative which can enhance the salty ion erosion resistance, freezing-thawing cyclic damage resistance and penetration resistance of concrete. The concrete preservative disclosed by the invention comprises the following components in percentage by weight: 30.0-50.0 percent of mineral admixture, 30.0-50.0 percent of expanding agent, 5.0-10.0 percent of corrosion inhibitor, 0.001-0.005 percent of air entraining agent and 1.0-10.0 percent of water reducing agent. By adopting the concrete preservative disclosed by the invention, the compactness of concrete can be enhanced, the concentration of sulfate ions capable of invading concrete can be lowered, the pore diameters of capillary pores can be reduced and the precipitating speed of calcium hydroxide from set cement can be restrained, so that the structural durability of concrete is enhanced. The concrete preservative is suitable for reinforced concrete structures in unfavorable geological regions, such as coal measure strata containing sulfate and magnesium and chloride ions, sulfide ore strata, seashore saline fields, coastal harbors and the like, as well as marine waters.

The invention discloses a geological prediction system for constructing a tunnel passing through coal measure strata. The condition of the tunnel passing through the coal measure strata is specifically analyzed in a way of geological record, geophysical prospecting analysis or advance borehole according to specific condition based on macroscopic analysis which is adopted in sequence; the obtained information is classified so as to predict the geological condition of a main job and the geologic hazard of the coal measure strata; and the correlative information and data are used for completing the construction of the geological prediction system for constructing tunnel passing through coal measure strata. The invention provides a system for perfectly and exactly predicting the geology for constructing the tunnel passing through coal measure strata.

The invention discloses a dynamic water quicksand stratum reinforcement grouting diffusion rule visual simulation experimental device and method. The device comprises an experimental box, a hydraulic pressure control loading system, a vertical hydraulic loading mechanism and a lateral hydraulic loading mechanism, a double liquid chemical grouting system and a test system connected to a computer. The method adopts an engineering geomechanical experimental model with a coal measure stratum physical analog simulation material, a waterproof stratum and an aquifer of certain height filled in the experimental box, aquifer grouting and water-plugging reinforcement visual physical simulation test is carried out hermetically under the conditions of circulating dynamic water pressure and vertical and horizontal lateral stress to acquire or quantitatively describe and analyze the diffusion rule of double liquid chemical grout in the water-bearing sandstone layer or quicksand layer, thus realizing visual simulation experiment of the double liquid component chemical grouting and water-plugging process under a similar water burst or water inrush condition. The method can effectively recognize and reveal the slurry diffusion and consolidation characteristics under a mining dynamic water condition, determine rational grouting and water-plugging parameters, and evaluate the grouting effect.

The invention discloses a simulation test device and a simulation test method for coal measure strata fracture seepage under loading and unloading conditions. The device comprises an experimental tank, a hydraulic pressure control loading system, a confining pressure loading system, a fracture structure, a deformation test system and a seepage characteristic parameter test system. According to the method, a way of filling the experimental tank with a coal measure strata physical similar simulation material and large-scale concrete block structure fracture is adopted, physical simulation tests of coal measure strata large-scale structure fracture deformation and seepage coupling effect processes due to the loading and unloading action under the conditions of top plate load, top plate hydraulic pressure, and adjustable confining pressure can be implemented, so that various mechanisms and key parameters such as different coarse structure fracture macroscopic deformation, saturated seepage and mutual coupling effect thereof, fracture seepage characteristic mutation under the loading and unloading conditions can be obtained or quantitatively described, further, mining-induced fracture structure evolution and seepage dynamic characteristic under the mining disturbance action can be effectively understood and revealed, and a theoretical basis is provided for further deepened research on mine water disaster mechanisms as well as prevention and control technologies.

The invention relates to a coal measure needle coke preparing method, belonging to a producing method for coking chemical industry, adopting coal pitch, coal tar, and heavy fractions of coal tar as raw materials, mixing, purifying, condensing, coking and calcining to make the coal measure needle coke, where the concrete steps comprise: (1) mixing; (2) purifying: heating the mixed raw materials by tubular furnace and eliminating quinoline insoluble substance by purifier through sedimentation, configuration and filtration; (3) condensing; (4) coking; and (5) calcining, making the coal measure needle coke. And it has advantages of high utilization ratio of raw materials, low production cost and good product quality.

The invention discloses a method for preparing ultralight ceramsites from clay iron-containing tailings. The ultralight ceramsites are prepared from the following raw materials in percentage by weight according to dry basis weight: 40-48 percent of clay iron-containing tailings, 40-48 percent of coal series kaolinite or coal gangue and 8-15 percent of dewatered sludge; the method comprises the following preparation processes: mixing materials, pelletizing, drying, preheating, calcining and cooling; under an optimum formula and process conditions that the preheating temperature is 500-600 DEG C, calcination temperature is 1250-1350 DEG C, and the heating rate is 10-15 DEG C/min, the all-solid waste ultralight ceramsites with the bulk density of 390 kg/m<3>, cylinder compressive strength of 1.2 MPa and the water absorption of 3.8% can be prepared through firing, and meet requirements of GB/T17431.1-2010, a novel approach is developed for abundant utilization of tailings, coal gangue and dewatered sludge and obvious economic benefits, environmental benefits and social benefits are realized.

The invention relates to a downhole directional hole bedding guided drilling system and method based on formation lithology identification. The lithology while-drilling identification of a drilling stratum is achieved through a direct parameter comparison method and an orientation radiating rose diagram comparison method according to coal measure stratum lithology while-drilling identification criteria and the stratum natural radiation value, measured by a coal measure stratum physical property parameter while-drilling measurement device in real time, of the near-bit position. By combination with measurement of a drilling track, precise space positioning of a practical drilling track relative to a target stratum is achieved, and bases are provided for controlling a downhole directional hole to do bedding extension in the target stratum in the preset direction; the technical problems that an existing underground coal mine directional drilling technology can only conduct drilling according to the space geometric positioning of the drilling track, cannot distinguish strata and is poor in drilling efficiency and low in target stratum elongation are solved; and through precise bedding directional drilling of the downhole directional hole, an effective means is provided for improving the drilling construction efficiency and the utilization effect, verifying the stratum geological information of a mine lot and ensuring drilling construction safety.

The invention provides a 3D printing-based layered prefabricated defect coal and rock mass sample preparation device and method. The method comprises the following steps: structural parameters of underground coal measure strata coal and rock mass are collected on site, a digital strata model is established, a reasonable similarity material ratio is selected, a concrete material is prepared, a 3D printing technology is used to print and prepare a complex layered structural rock mass model, maintenance is carried out, after the maintenance is completed, the integral model is taken out, coring iscarried out on a specially-made coring machine with an adjustable base, machining and grinding are carried out on the coring machine, and finally the layered prefabricated defect coal and rock mass sample is obtained. According to the device and the method in the invention, various geological structures such as various joints, fractures, bedding, faults and the like contained in the underground engineering strata can be restored and simulated accurately, the attitude of the coal measure strata can be accurately reproduced; and the coal and rock mass sample is provided, thereby facilitating the mechanical behavioral research of the coal and rock mass with the complex layered structure.

The invention discloses a method for recognizing the coal measure strata lithology. The method includes the following steps: dividing a coal measure strata into a plurality of rock physical facies based on rock physical characteristics of the coal measure strata; extracting logging characteristic parameters of the coal measure strata according to a logging curve of a key well, and determining a principal component parametric model meeting the rock physical characteristics of the coal measure strata; comparing the plurality of rock physical facies and known geologic facies of the key well, and establishing a corresponding relationship between the rock physical facies and the geologic facies; and layering a logging response curve of a target well, calculating a principal component numerical value of each layer of the coal measure strata based on the principal component parametric model, determining the rock physical facies corresponding to the coal measure strata layer-by-layer, and recognizing the strata lithology according to the corresponding relationship between the rock physical facies and the geologic facies. Through non-linear comprehensive assessment, the method can rapidly and accurately recognize the rock physical facies of the coal measure strata.

The invention discloses a construction method for tunnels with karst and gas simultaneously. The construction method comprises following construction process: 1) advanced geological detection; 2) excavation construction; 3) tunnel muck hauling; 4) primary support; 5) lining construction; 6) water prevention and drainage construction; 7) construction ventilation; 8) construction power supply; and 9) treatment of collapse of coal measure strata. The construction method not only guarantees construction safety, but also meets the requirement on construction quality of the tunnels, and is mainly applied to construction of the tunnels with karst and gas simultaneously.

A simulation test system for gas extraction from a tectonically-deformed coal seam in-situ by depressurizing a horizontal well cavity. A coal series stratum structure reconstruction and similar material simulation subsystem simulates a tectonically-deformed coal reservoir. A horizontal well drilling and reaming simulation subsystem constructs a U-shaped well in which a horizontal well adjoins a vertical well, and performs a reaming process on a horizontal section thereof. A horizontal well hole-collapse cavity-construction depressurization excitation simulation subsystem performs pressure-pulse excitation and stress release on the horizontal well, and hydraulically displaces a coal-liquid-gas mixture such that the mixture is conveyed towards a vertical well section. A product lifting simulation subsystem further pulverizes the coal and lifts the mixture. A gas-liquid-solid separation simulation subsystem separates the coal, liquid and gas. A monitoring and control subsystem detects and controls the operation and the execution processes of equipment in real time.

The invention discloses a coal measure strata tunnel milling digging and blasting combined construction method which includes: performing milling digging grooving on an upper step arc guide part (1), performing initial supporting after grooving of the upper step arc guiding part (1) is finished to form a stable bearing arch, performing milling digging grooving on two side walls of a lower step on a lower step left side wall part (4) and a lower step right side wall part (3), performing initial supporting, performing core earth drilling, explosive filling and initiating on an upper step core earth part (2) and a lower step core earth part (5), ventilating, deslagging, and repeating the steps until a whole tunnel is dug. The construction method fully expresses the advantages of a mechanical milling digging method and a drilling blasting method, achieves accurate forming of a tunnel outline through mechanical milling and digging, causes small surrounding rock disturbance, is good in back break control effect, good in operation environment and high in construction security, reduces back break, protects surrounding rock, improves self-bearing capacity of the surrounding rock and avoids large deformation and partial collapse.

The invention relates to measurement while drilling systems, in particular to a coal mine underground explosion proof type electromagnetic wave wireless measurement while drilling system and an application method thereof. The coal mine underground explosion proof type electromagnetic wave wireless measurement while drilling system comprises a hole inner instrument and a hole opening instrument, wherein the hole inner instrument comprises a measuring short section 1, a rechargeable battery cartridge 2 and a transmission control short section 3, and the hole opening instrument comprises a receiving antenna 4 and an explosion proof computer 5. When the system works, engineering parameters of the hole inner of a drill hole are measured by the hole inner instrument in real time, the data is transmitted to the hole opening through a drill pipe rod and coal measure strata in an electromagnetic wave wireless transmission mode, and the data is sent to the explosion proof computer 5 for being processed and displayed after the data is received by the hole opening receiving antenna. The system has working modes of continuous working and intermittent working, electromagnetic waves are used as a signal carrier, electromagnetic pulses are used as a data transmission mode, and the drill hole track repetition measurement or the measurement of the engineering parameters of the hole inner of the drill hole can be carried out without communication cables. The system is versatile, real-time and explosion-proof.

The invention discloses a multi-field precursor information evolution test device and test method for a large-size fractured rock rectangular cavity water inrush and relates to the field of rock mechanics and pressure-bearing penetration tests. The device comprises a test rack, a loading plate, a sample storage cavity, a side pressure loading system, a vertical loading system, a water pressure loading system, a water temperature adjusting system and a signal acquisition and processing system. After preparing of a large-size rock sample containing a rectangular cavity and a single fracture, thetest device and the test method can be used for researching evolution rules, coupling characteristics and influence factors of multi-field precursor information such as the single fracture surrounding rock stress, displacement, fracture, seepage and temperature in the water inrush process at different excavation depths of the rectangular cavity under water-force coupling. The water pressure loading system, the water temperature adjusting system and the side pressure loading system of the test device can better simulate the geomechanical environment of the fault-containing coal measure strataon the confined water, invert and analyze the mining fault water inrush mechanism in the deep confined water stoping working face so as to monitor and early warn mining fault water inrush.

The invention belongs to underground drilling detection methods for deep strata and relates to a drilling detection method for coal measure stratum structuring, weak area recognition and stratum inversion. An upward or downward penetrating long borehole is constructed in a mine coal-rock roadway; thrust, rotational speed, torque and drilling speed are recorded and calculated during drilling; energy consumed by drilling unit rock, namely drilling specific energy, is deducted so as to acquire a correspondence between the drilling specific energy and a drilling path; coal-rock seams in the coal measure stratum are different in physical and mechanical property, thus a drilling difficulty difference under equal conditions is high, different drilling ratios correspond to different coal-rock types, and the coal-rock types of different segments of the drilling path are determined accordingly; the drilling ratio on the drilling path can change abruptly, indicating the geological structure conditions. The drilling detection method has the advantages that by accurately controlling occurrence and geological structure conditions of the coal-rock seams of the coal measure stratum, mine coal-rock power, hydropower and gas disasters can be preventively controlled, and gas drainage and water drainage are more specific.

The invention discloses a five-segment-type millisecond electric detonator secondary blasting construction method capable of being applied to a high-gas large-section tunnel, and relates to selection of blasting construction electric detonators in the environment where gas or coal dust exists in a coal measure stratum passing segment of the tunnel or an excavation space or a blasting region. Blasting holes are designed according to tunnel surrounding rock and the outline of an excavated section, i.e., breaking-in holes, inner-circle auxiliary holes, outer-circle auxiliary holes, periphery holes and bottom-side holes are blasted in batches zone by zone; millisecond delay electric detonator segments are designed according to the blasting region; practical analysis is optimized constantly. The blasting construction method has great popularization significance in uncovering a coal seam safely and smoothly at a tunnel test mileage segment and achieving rapid and safe blasting and tunneling of the high-gas large-section tunnel.

The invention relates to the technical field of carbon-coated synthetic graphite negative electrode materials, in particular to a preparation method of a high-power carbon-coated synthetic graphite negative electrode material. The preparation method is characterized by comprising the following steps: crushing coal-measure green coke serving as a raw material A, so as to form a micro powder; crushing and grading asphalt serving a raw material B, so as to form a micro powder; performing modified heat treatment on the micro powder of the raw material A, and then performing normal temperature graphitization in a resistance type graphitization furnace; mixing and sieving obtained materials subjected to graphitization, so as to obtain a single particle graphitization product; uniformly mixing the single particle graphitization product and the micro powder of the raw material B, so as to perform coated modification; performing carbonizing treatment on materials subjected to coated modification, so as to solidify a coated layer; cooling the material to a room temperature, and mixing and sieving, so as to obtain a product. Compared with the prior art, the preparation method has the advantages that the electrode material has smaller reaction impedance, and the low-temperature performance and power characteristic of the material are enhanced; the cycling performance of the material is improved, meanwhile the graphitization cost is reduced, and the purpose of energy conservation is achieved.

The invention belongs to the technical field of preparation of inorganic ultrafine powder materials, and particularly relates to a dissociation method of a coal-series hard kaolinite rock lamella. The dissociation method comprises the following steps of; crushing coal-series hard kaolinite rocks, and mixing with water and an intercalator to obtain intercalated composite slurry; carrying out centrifugal separation on the intercalated composite slurry to obtain an intercalated composite sticky material and an intercalator solution; placing the intercalated composite sticky material into a calcining furnace, increasing temperature to 250-350 DEG C at 5-10 DEG C/minute; and after constant temperature is reached for 1.5-2.5 hours, washing and filtering, and then preparing filtered kaolinite into slurry again for spray drying to obtain a finished product. The method disclosed by the invention achieves the easiness for industrialization; and the dissociated kaolinite rocks can keep more complete kaolinite hexagonal-flaky crystals and have higher radius-thickness ratio and whiteness.

The invention discloses a preparation method for a fracture physical simulation test piece of a coal-measure composite reservoir, which is particularly suitable for the field of coal-measure gas development geology and rock mechanics. The preparation method comprises the following steps: first, acquiring large blocks of fresh coal samples and small blocks of rock samples with different lithologies; performing laser scanning on cross sections of the large blocks of the fresh coal samples and calculating the fractal dimension value of surface topography; carrying out X-diffraction analysis and rock mechanical test on the small blocks of the rock samples; blending and simulating different formulae by utilizing sand, cement and clay according to detection results; determining rock combinationtypes and stratum thickness with different lithologies of the coal-measure composite reservoir; preparing a coal-containing multi-lithology rock combination cubic test piece by using a mould; respectively drilling boreholes in the central parts of a coal sample and self-made rock samples with different lithologies on the same side surface of the cubic test piece; solidifying steel liquid injectionpipes in the boreholes to simulate the boreholes; performing external casting on the coal-containing multi-lithology rock combination cubic by utilizing a sealing material to prepare the fracture physical simulation test piece of the coal-measure composite reservoir with a standard size. The preparation method is simple in steps and convenient to use; the prepared test piece is closer to an actual situation.