39 results about "Ordovician" patented technology

The invention relates to a mine water overall treatment utilizing technology. Warm water in a mined out is utilized for space heat exchange, underground drainage drilling water contained in limestone formed in Ordovician is utilized for preventing dust underground, magmatic rock drainage drilling water is used as domestic water and underground sewage is utilized after treated. The invention solves the treatment difficulty of a large quantity of mines, avoids polluting the environment, and saves precious water resources.

The invention discloses a method for modification and construction of top of Ordovician limestone of mine based on kilometer directional drilling technique. The method comprises the following steps: the drilling work for grouting modification of the top of the Ordovician limestone of the mine is applied through a kilometer directional drilling machine, a hole is drilled nonlinearly along the layer, a layout form of drilling the hole can be one perforated hole and multiple intersected holes, and advance grouting is adopted. According to the method for modification of the top of the Ordovician, the problem of safety mining under the conditions of insufficient thickness and strength of a water resisting layer when performing coal mining above a confined aquifer. An Ordovician limestone karst development structure and a hidden rupture structure are blocked in a large scale without occupying coal mining or driving face, a permeable layer at the top of the Ordovician limestone is converted to a water resisting layer in a certain range, so that ore resources threatened by the confined water are released, driving and recovery can be applied under the environment, no or few water prevention (separation) coal pillars can leave, and the resource recovery rate is improved.

The invention discloses a method using surface orientation bedding drilling grouting to reinforce laminar limestone. The method includes: performing surface drilling until a suspected water outlet point is reached, performing drilling grouting, wherein drilled holes include a main hole and branch holes, the main hole is provided with a straight hole section and an oriented bedding section, an oriented slanting-guide section is further arranged between the straight hole section and the oriented bedding section, and the branch holes include primary branch holes and secondary branch holes; a water-bearing stratum is modified through the drilling grouting, grouting pressure is 1.5-3.5 times of the hydrostatic pressure of a to-be-grouted point, grouting termination pressure is 3.5-4 times of the hydrostatic pressure, and the lime-cement-flyash water-bearing stratum is transformed into a water-resisting layer to resist lime, cement and flyash and water of the water-bearing stratum below the lime, cement and flyash. By the method, hidden water guide channels are blocked, a base Ordovician limestone karst powerful water source is blocked, and safety of deep exploitation is guaranteed.

The invention discloses a well placing method for a karst-type carbonate reservoir in the technical field of oil and gas exploitation. The well placing method for the karst type carbonate reservoir comprises the steps that S1, firstly, the Ordovician Karst-type reservoir is selected as a well placing object; S2, a plurality of reaction-sensitive parameters of a carbonate rock karst-type reservoir are extracted and screened; S3, the fracture development density generated by multi-stage tectonic movement is predicted through the response variable analysis technology; S4, an ancient geomorphological map of original Ordovician carbonate rock karst is drew; S5, the wave impedance difference of different lithology sections of Ordovician carbonate rock is utilized to determine the reservoir thickness and the spatial distribution form; S6, reasonable evaluation indices are determined, and the karst-type reservoir with consistent reaction through a variety of information is a development zone; and S7, a favorable area with high evaluation indices is selected to conduct well position placing. The serious heterogeneity problem of the reservoir is effectively solved, the reliable basis is provided for well position placing, and the well placing method is reasonable.

The invention belongs to the technical field of mine Ordovician limestone aquifer grouting transformation, and relates to a method for reinforcing a working surface bottom plate by Ordovician limestone top grouting. According to the method, on the basis of analyzing the feasibility of the Ordovician limestone top grouting, a working surface, threatened by Ordovician limestone water, of lower group coal is analyzed, and a region of the working surface bottom plate transformed by the Ordovician limestone top grouting is determined; by starting from a water bursting coefficient, the Ordovician limestone top grouting depth is determined; the Ordovician limestone top grouting condition of the lower group seam is analyzed; concrete requirements are made for the grouting transformation work of each coal seam; then, a design of a grouting inclined hole three-stage sleeve and a principle of uniformly forming drill holes on the working surface are adopted, and the effectiveness and the pertinence of the Ordovician limestone aquifer grouting are ensured; finally, various methods are adopted for evaluating the grouting effect in a combined way; a region threatened by the Ordovician limestone water can be divided in time; the Ordovician limestone grouting thickness can be determined in time; the working surface bottom plate is reinforced through grouting; the safe mining of the working surface threatened by the Ordovician limestone water is ensured; the output of a resource-exhausted mine is improved; and the service life of the mine is prolonged.

The invention discloses a complex carbonate oil and gas reservoir mode evaluation method. According to the method, on the basis of study and exploitation on the oil and gas reservoir, in combination with construction, fracture, stratum and sedimentary reservoir geological characteristics, three Ordovician carbonate oil and gas accumulation modes are established, including a broken-back inclined combination accumulation mode, a slope deep karst accumulation mode and a slope break belt phase control accumulation mode. Through the method, understanding about Ordovician carbonate oil and gas accumulation is further supplemented and deepened, through exploration and practice verification, Ordovician carbonate oil and gas occurrence areas are expanded, Ordovician carbonate oil and gas geological reserves are greatly improved, and the method has great importance on reserve and production increase of the oil and gas.

The invention discloses a coalmine Ordovician-limestone high-pressure-bearing water bottom plate fracture grouting material and a preparing method thereof. The grouting material is characterized by comprising, by weight, 60 parts of coal gangue powder, 25 parts to 30 parts of ordinary portland cement and 10 parts to 15 parts of clay in a mixing-grinding mode, wherein the size of particles of the coal gangue powder obtained before mixing is smaller than 45 un. According to the coalmine Ordovician-limestone high-pressure-bearing water bottom plate fracture grouting material and the preparing method, on the basis that high-pressure-bearing limestone at a specific-depth portion of a coalmine is reconstructed, coal gangue is sufficiently used for reducing the cost of the grouting material; the clay is a raw material low in price and easy to get, the requirements for the indexes of the grouting material are met while cost is saved, the waste coal gangue of the coalmine can be sufficiently used for treating an Ordovician-limestone water partition layer accordingly, the grouting treatment cost can be effectively reduced, the enterprise income can be increased, and the mine-lot ambient environment can be easily improved.

The invention discloses a prediction method for lateral distribution of an ordovician limestone karst crack water network, which comprises the steps: firstly determining indexes closely related to distribution of the ordovician limestone karst crack water network, then collecting index original data at underground ordovician limestone hodrology drill holes with geophysical exploration, establishing a kernel main component model for the collected index original data, extracting new main components, then performing fuzzy standardizing, combining main component data subject to fuzzy standardizing and geophysical exploration ordovician limestone karst abnormal types into a sample set, and establishing a prediction model of a genetic algorithm optimization SVM; utilizing the well-established model to predict ordovician limestone karst abnormal region types at the underground ordovician limestone hodrology drill holes without geophysical exploration; finally drawing a distribution graph of the ordovician limestone karst abnormal region types, judging a distribution range of the ordovician limestone karst abnormal region types and analyzing a transfusion field direction of the ordovician limestone karst crack water network. The method is reliable in design principle, simple in prediction method, high in prediction precision and friendly in prediction environment.

The invention relates to structural discrimination indexes of ordovician limestone top filling zones and a determination method, belonging to the field of structural discrimination indexes of water-containing geology and determination methods. Coal field-based ordovician limestone top filling zones, the buried depths of which are more than 300 m, are divided into three forms including a water-resisting filling zone, a weak water-resisting filling zone and a water-enriched zone; the water-resisting filling zone can be directly used as a water-resisting layer; the weak water-resisting filling zone can be utilized after being improved into the water-resisting layer through slurry ejection; discrimination and developing depths, namely determination of thicknesses, of the water-resisting filling zone and the weak water-resisting filling zone have great significance to mine lower coal group in the deep part of a coal field, the buried depth of which is more than 300 m, and prevent and control ordovician limestone water damage; the types of the ordovician limestone top water-resisting filling zones are divided according to the drilling unit water inflow q value, the underground drilling dewatering test Q value and the penetration test K value; and type discrimination index threshold values and determinations thereof are given. The structural discrimination indexes disclosed by the invention are obtained from conventional hydrological tests, and have the advantages of being relatively simple to obtain, easy to operate by field staffs, convenient for field application and practice and wide in application prospect.

The invention provides an online intelligent monitoring and early-warning system of ordovician limestone water burst of a coal mine bottom slab. A plurality of multi-parameter sensing subsystems are arranged on the coal mine bottom slab containing ordovician limestone, sensing data obtained through online monitoring are transmitted to a database server through a wireless / wire communication subsystem, and then intelligent early-warning is conducted on the water burst of the coal mine bottom slab through an intelligent water burst early-warning subsystem. By the adoption of the one-hole multi-sense mode, wireless transmission and intelligent early-warning, accurate, convenient, fast and efficient online mine water burst monitoring and early-warning are achieved.

The invention discloses a blocking method of an insidious karst collapse pillar of a deep coal mining layer. Grouting governing is conducted, grouting governing adopts a three-stage filling grouting method through drill holes to conduct grouting, a water-stopping plug is formed on a base plate water-containing layer, and the water-stopping plug is complete and relatively water insulation. Grouting through the three-stage filling grouting method comprises the following steps that (1), an aggregate water-blocking body is formed through aggregate filling; (2), reinforcing grouting is conducted through filling of cement / coal ash to form a mixed water-blocking body; and (3) the grouting is filled with cement to form a cement water-blocking body. Through the technical scheme of the three-stage filling grouting method provided by the invention, the collapse pillar is quickly blocked, the residual water gushing quantity of the mining working face is less than 5 m<3> / h, it is guaranteed that an explored water gushing channel and pre-existing fracture are subjected to high-pressure grouting, and an effective water-blocking plug is formed on a target layer, so that the effect of water gushing blocking of the target layer and ordovician limestone water-containing layers below the target layer is achieved, and water holding safe mining is completed.

The invention discloses a prediction method suitable for an ordovician Ma5-5 gas reservoir dolomite reservoir. The method is characterized by, on the basis of data analysis of applied geology, well drilling and logging and the like, carrying out thin layer division and contrast on ordovician carbonate formation, carrying out formation distribution, sedimentary microfacies, reservoir characteristics, dolomitization and dolomite genesis study, recovering a palaeotopographic map when Ma5-5 deposits, analyzing formation mechanism of Ma5-5 dolomite and realizing predication of the Ma5-5 dolomite, thereby improving drilling ratio of the Ma5-5 dolomite reservoir.

A defluorinating fuel for preventing fluorine poison in western Guizhou province of China is prepared from late-Perm coal, the clay rock taken from Emei mountain and Longtan, and Ordovician lime stone.

The invention discloses a method for preparing rhomb-shaped superfine calcium hydrogen carbonate from Weibei ordovician limestone. The method comprises the following steps: crushing, cleaning, drying and sieving Weibei ordovician limestone, so as to obtain 1.6mm-2.0mm particles; calcining the particles at 1000 DEG C for 60 minutes, so as to obtain high-activity lime; mixing the high-activity lime with water of 90 DEG C, so as to prepare 5.6wt% of a lime emulsion; adding the lime emulsion into a container, putting the container into an ultrasonic vibrator, adding sodium laurate into the container, introducing CO2 gas, stirring, and reacting at 20 DEG C; when the pH is decreased to 7, stopping the introduction of CO2, turning off the ultrasonic vibrator, and continuing to stir for 20 minutes; and filtering, washing, and drying and grinding solute, so as to obtain the superfine calcium hydrogen carbonate. The method has the beneficial effects that the Weibei ordovician limestone is taken as the raw material, a carbonization method is adopted, a crystalline-form control agent, namely sodium laurate is added before carbonization, a gas distributor and an ultrasonic technique are adopted during the carbonization, and the rhomb-shaped superfine calcium hydrogen carbonate with excellent performance and high added value is prepared.

The invention provides a multivariable-based Taiji group limestone aquifer water inrush risk classification and discrimination method. The multivariable-based Taiji group limestone aquifer water inrush risk classification and discrimination method comprises the steps of S1, screening Taiji group limestone water inrush risk classification and discrimination variables; S2, performing Taiji group limestone water inrush risk classification according to variables according to variables, and the Taiji group limestone water inrush risk classification includes S21, safety types including the top platesafety type and the bottom plate safety type; S22, roof Taiji group limestone aquifer water inrush dangerous types including the roof water inrush dangerous type-no supply type and the roof water inrush dangerous type-supply type; S23, bottom plate Taiji group limestone aquifer water inrush danger types including a bottom plate too-grey single water inrush danger type-no supply and a bottom platetoo-grey single water inrush danger type-supply; S24, the bottom plate Taiji group and the Ordovician limestone aquifer associated with a water inrush dangerous type; and S25, collapse column and fault through water inrush danger type.

The invention provides a method for evaluating the water-resisting property indexes of a Middle Ordovician limestone ancient weathering crust. According to the technical scheme, the method is characterized by including the following steps that firstly, it is determined that water-resisting property indexes are depicted; secondly, thematic maps of the water-resisting property indexes are established; thirdly, weight coefficients of the indexes are determined based on the information fusion technology; fourthly, the thematic maps of the water-resisting property indexes are overlapped; fifthly, a water-resisting property evaluation model is established; sixthly, the water-resisting property is divided and evaluated. A mine lot is divided into five sub lots, a weak water-resisting property lot, a weaker water-resisting property lot, a transition water-resisting property lot, a stronger water-resisting property lot and a strong water-resisting property lot. The method for evaluating the water-resisting property indexes of the Middle Ordovician limestone ancient weathering crust is provided for the first time, and the water inrush evaluation and prediction defects that in the mining practice, the water inrush phenomenon never occurs on many water inrush points with the values far larger than a critical value in the seam floor water inrush evaluation process are overcome.

The invention discloses a technical method for detecting a ground surface strike-slip fracture system based on a ground penetrating radar technology and applied to deep carbonate rock strike-slip fracture interpretation, and belongs to the field of geological exploration. The method includes the following steps: 1) carrying out field geological background research and typical strike-slip fracture outcrop radar operation area selection; 2) designing and arranging ground penetrating radar survey lines and acquiring field data; (3) optimizing parameters for indoor processing and interpretation of ground penetrating radar data; and 4) under the similar geological background, comparing the radar interpretation result with the strike-slip fracture in the deep carbonate rock stratum so as to guide the interpretation of an underground strike-slip fracture system. The new method for detecting the ground surface strike-slip fracture through the ground penetrating radar technology is created, meanwhile, the ground surface strike-slip fracture development law is controlled by utilizing the characteristics of lossless and efficient detection of the ground penetrating radar and combining geological conditions, the method is applied to explanation of deep stratum complex strike-slip fracture, a good effect is achieved in explanation of strike-slip fracture in Tabei Ordovician stratums, and the application prospect is wide.

The invention discloses a northern bauxite positioning method and device, relates to the field of metal ore and geophysical exploration, and aims to solve the problem that a detection result is not accurate enough due to a single bauxite detection means in the prior art. The method comprises the following steps: determining an upper interface of Ordovician limestone and the position of an Ordovician limestone concave hopper in the horizontal direction in a to-be-estimated area by utilizing a transient electromagnetic method; determining the position of the Ordovician limestone concave hopper in the vertical direction in the to-be-estimated area by using a seismic survey method; and determining the positions of the Ordovician limestone top surface concave areas in the horizontal direction and the vertical direction as bauxite occurrence positions by integrating transient electromagnetic method detection data and seismic survey method detection data. The device comprises a transient electromagnetic method detection module, a seismic exploration module and an analysis module. According to the method, the non-uniform abnormal positions in the horizontal direction and the vertical direction are determined through a transient electromagnetic method and seismic prospecting, transient electromagnetic and seismic prospecting profiles are comprehensively analyzed, and bauxite can be finely positioned.

The invention discloses a downhole layered reinforcing method of closed bad drilled holes, and relates to the technical field of mine treatment. The method comprises the steps that (1) inspection drilled holes are arranged; (2) grouting blocking is sequentially carried out on the first inspection drilled hole, the second inspection drilled hole and the second inspection drilled hole after construction. The method has the beneficial effects that the downhole layered reinforcing method is adopted, the thickness of water-proof layers can be guaranteed, confined water between the water-proof layers can be sealed, meanwhile, the manner of high-density hole distribution and layered grouting reinforcing is adopted, a water-proof curtain is formed on a closed bad drilled hole coal baseplate and anordovician limestone layer, a water guide channel communicating with the closed bad drilled holes is cut off, downhole prevention of drilling water is achieved, the situation that the drilling downhole ground cannot be unsealed due to the ground environment influence is avoided, and the effective method is provided for treatment of the closed bad drilled holes with finished holes in ordovician limestone.

The invention provides an Ordovician grey water inrush early warning method, system and device. The method comprises the following steps: A, collecting a plurality of water sample data and aquifer labels for each aquifer; b, inputting the data into a random forest algorithm, training by a ten-fold cross validation method, and outputting a confusion matrix and the contribution rate of parameters to a classification result; c, calculating the percentage of each aquifer which is wrongly divided into Ordovician grey water as similarity, and determining a water inrush risk threshold value; d, if the similarity reaches a water inrush risk threshold value, the water inrush risk exists in the aquifer; e, taking the first n parameters with the highest contribution rate as sensitive indexes, taking the sensitive indexes of the water sample in the step A as a training set, and inputting a random forest algorithm to obtain a recognition model; and F, collecting data of a to-be-identified water sample, inputting the data into the identification model, and if the similarity exceeds a water inrush risk threshold, determining that the water inrush risk exists. The method has the advantages that risk early warning is carried out through the properties of the water samples, judgment is integrally carried out through the multiple water samples, and the accuracy is high.

The invention discloses a multi-field coupling test device and method for simulating deep mining Ordovician limestone water inrush, and mainly relates to the field of coal mine goaf disaster prevention and control. According to the test method, rock stratum models with different proportions or different structures or different distributions are established according to actual geological conditions of a coal mine, various conditions such as deep ground stress, bottom plate water pressure, rock stratum temperature and mining disturbance are simulated through the test device, and various measurement data in the test process are recorded. A deep mining coal seam floor Ordovician ash water inrush phenomenon and a path are generated. The test device is simple in structure, convenient to maintain and accurate in monitoring data, the test method is scientific in principle and easy and convenient to operate, the characteristics and mechanisms of the Ordovician limestone water inrush in deep mining are simulated and analyzed, teaching tasks and test exploration of the Ordovician limestone water inrush mechanism are met, and effective test data are provided for prevention and control of the Ordovician limestone water inrush and safe mining of coal mines.

The invention relates to a comprehensive treatment method for mountain green coal water disasters in a complex structure area. The method comprises the following specific steps that a horizontal branch hole is drilled from a window entry point in a treatment target layer, circulating liquid is injected at the same time, and related data are recorded; the recorded data are analyzed and compared with existing data, and the development part, the spatial form and the scale of a vertical water guide structure and the fracture development part and the connectivity of the treatment target layer are judged; when the leakage amount of the circulating liquid is abnormal, a drill is withdrawn to conduct grouting operation, and grouting reinforcement is conducted on the area; and after grouting reaches the preset pressure, grouting is stopped, hole sweeping operation is carried out, and drilling continues until construction is completed. The method has the beneficial effects that grouting transformation of a target aquifer is realized, the integrity of a coal seam floor is enhanced, the risk of disastrous ordovician limestone water inrush of the coal seam floor is further reduced, the working efficiency is greatly improved, and the safety of workers is guaranteed; and meanwhile, underground water resources can be protected, and the water-preserved mining effect is achieved.

The invention provides an online intelligent monitoring and early-warning system of ordovician limestone water burst of a coal mine bottom slab. A plurality of multi-parameter sensing subsystems are arranged on the coal mine bottom slab containing ordovician limestone, sensing data obtained through online monitoring are transmitted to a database server through a wireless / wire communication subsystem, and then intelligent early-warning is conducted on the water burst of the coal mine bottom slab through an intelligent water burst early-warning subsystem. By the adoption of the one-hole multi-sense mode, wireless transmission and intelligent early-warning, accurate, convenient, fast and efficient online mine water burst monitoring and early-warning are achieved.

The invention relates to a mine water overall treatment utilizing technology. Warm water in a mined out is utilized for space heat exchange, underground drainage drilling water contained in limestone formed in Ordovician is utilized for preventing dust underground, magmatic rock drainage drilling water is used as domestic water and underground sewage is utilized after treated. The invention solves the treatment difficulty of a large quantity of mines, avoids polluting the environment, and saves precious water resources.

A method and device for detecting the undulating shape of the Ordovician limestone top interface at the base of a coal seam, involving the fields of geology and geophysics, and solving the problem of accurate detection of the undulating shape of the Ordovician limestone at the base of the coal seam. The corresponding characteristic parameters are used to predict the ups and downs of the ash top interface of the coal seam base, including: obtaining the electric field component value or the electric field component value and the magnetic field component value of each detection point in the section of the area to be measured changing with the detection frequency; according to the obtained electric field component value or electric field component value and magnetic field component value to obtain the depth-sounding apparent resistivity value of each detection point changing with the detection frequency, and determine the corresponding depth-sounding apparent resistivity value changing with the detection frequency according to each detection point. Resistivity curve; determine the feature point frequency corresponding to the minimum value of apparent resistivity on the depth-sounding apparent resistivity curve; determine the surface fluctuation of the austrian ash top interface of the coal seam base in the area to be measured according to the feature point frequency corresponding to each of the detection points form.

The invention discloses a method for modification and construction of top of Ordovician limestone of mine based on kilometer directional drilling technique. The method comprises the following steps: the drilling work for grouting modification of the top of the Ordovician limestone of the mine is applied through a kilometer directional drilling machine, a hole is drilled nonlinearly along the layer, a layout form of drilling the hole can be one perforated hole and multiple intersected holes, and advance grouting is adopted. According to the method for modification of the top of the Ordovician, the problem of safety mining under the conditions of insufficient thickness and strength of a water resisting layer when performing coal mining above a confined aquifer. An Ordovician limestone karst development structure and a hidden rupture structure are blocked in a large scale without occupying coal mining or driving face, a permeable layer at the top of the Ordovician limestone is converted to a water resisting layer in a certain range, so that ore resources threatened by the confined water are released, driving and recovery can be applied under the environment, no or few water prevention (separation) coal pillars can leave, and the resource recovery rate is improved.

The invention discloses a method for preparing rhomb-shaped superfine calcium hydrogen carbonate from Weibei ordovician limestone. The method comprises the following steps: crushing, cleaning, drying and sieving Weibei ordovician limestone, so as to obtain 1.6mm-2.0mm particles; calcining the particles at 1000 DEG C for 60 minutes, so as to obtain high-activity lime; mixing the high-activity lime with water of 90 DEG C, so as to prepare 5.6wt% of a lime emulsion; adding the lime emulsion into a container, putting the container into an ultrasonic vibrator, adding sodium laurate into the container, introducing CO2 gas, stirring, and reacting at 20 DEG C; when the pH is decreased to 7, stopping the introduction of CO2, turning off the ultrasonic vibrator, and continuing to stir for 20 minutes; and filtering, washing, and drying and grinding solute, so as to obtain the superfine calcium hydrogen carbonate. The method has the beneficial effects that the Weibei ordovician limestone is taken as the raw material, a carbonization method is adopted, a crystalline-form control agent, namely sodium laurate is added before carbonization, a gas distributor and an ultrasonic technique are adopted during the carbonization, and the rhomb-shaped superfine calcium hydrogen carbonate with excellent performance and high added value is prepared.

The invention discloses a prediction method for lateral distribution of an ordovician limestone karst crack water network, which comprises the steps: firstly determining indexes closely related to distribution of the ordovician limestone karst crack water network, then collecting index original data at underground ordovician limestone hodrology drill holes with geophysical exploration, establishing a kernel main component model for the collected index original data, extracting new main components, then performing fuzzy standardizing, combining main component data subject to fuzzy standardizing and geophysical exploration ordovician limestone karst abnormal types into a sample set, and establishing a prediction model of a genetic algorithm optimization SVM; utilizing the well-established model to predict ordovician limestone karst abnormal region types at the underground ordovician limestone hodrology drill holes without geophysical exploration; finally drawing a distribution graph of the ordovician limestone karst abnormal region types, judging a distribution range of the ordovician limestone karst abnormal region types and analyzing a transfusion field direction of the ordovician limestone karst crack water network. The method is reliable in design principle, simple in prediction method, high in prediction precision and friendly in prediction environment.

The invention discloses a method for searching for and preventing mine water seepage of an Ordovician limestone mine field. The method comprises the following steps: drilling a first vertical well vertical to the ground in the center of a coal mine area by using a first drill bit, and stopping drilling and cementing the well until the depth of the vertical well is 8-12 m into bed rock; further drilling downwards by using a second drill bit, and stopping drilling and cementing the well until the second drill bit penetrates into a coal bed by 5-10 m; further drilling downwards by using a third drill bit slantly in multiple directions to form an inclined well, and horizontally drilling after the third drill bit enters Ordovician limestone; in the horizontal drilling process of the drill bit, searching an Ordovician limestone gap, and plugging the gap till the edge of the coal mine area. Compared with the conventional vertical-well drilling for grouting plugging, horizontal-well multi-branch plugging construction really reduces manpower investment, equipment investment, construction area and other investments; by the method, the problem of lower group coal mining can be safely and efficiently solved, the water blocking performance of each floor water-resisting layer is improved, and pressure mining is implemented; by the method, a lot of money for water control in coal mining can be saved and coal resources are further released.

The invention relates to a northern karst spring protection and water quality evolution simulation device. The northern karst spring protection and water quality evolution simulation device includes a water supply device, a seepage device and a spring water control device; a seepage column is a cylindrical structure which is arranged obliquely and simulates a monoclonal structure; the closed end of the seepage column is provided with a water outlet; the spring water control device is arranged at the water outlet; the seepage column is filled with a Cambrian-Ordovician limestone seepage medium; a plurality of pressure measuring openings and water taking openings are arranged at the side wall of the seepage column; the pressure measuring openings are respectively connected with a pressure measuring tube; the pressure measuring tubes are respectively provided with a valve; the water taking openings are respectively provided with a flow meter and a valve; the water supply device comprises a water bearing layer leakage recharge device and a rain water supply device; the side wall of the upper end of the seepage column is provided with an overflow opening; and the overflow opening is connected with an overflow bottle through a pipeline. With the northern karst spring protection and water quality evolution simulation device of the invention adopted, a northern karst spring water quality evolution process can be simulated, and karst spring water quality evolution laws can be explored, and a scientific basis can be provided for the formulation for spring protection measures.