68 results about "Adit" patented technology

The invention discloses an underground large-water mine fine ore recovery technology, and relates to the technical field of fine ore recovery. The method comprises the steps that S1, underground equipment is prepared and arranged; s2, collecting fine ore in the stope; s3, ore screening and material preparation; s4, determining the diameter of the pipeline; s5, calculating the pressure loss of the pipeline; s6, stirring and modifying the ore pulp; and S7, ore screening and wastewater recycling. The process belongs to active recovery of the fine ore, all the fine ore produced in the mine can be recovered, the intermediate transportation and crushing steps of the recovered fine ore are omitted, and the problem that the ore slurry formed after the fine ore meets water blocks a draw shaft and a drainage channel is solved. And the fine ore is directly recovered and passes through the crushing stage, so that the loss of the fine ore in the transportation process is effectively reduced, and the resource recovery rate is greatly improved. Compared with the prior art, fine ore can be actively recycled, and the recycling efficiency is high. Equipment used in the process is more flexible, and there is no need to excavate more laneway projects for treating the fine ore.

According to the fixed-point coring drilling tool for directional drilling of the underground tunnel, the coring drill bit and the technology, the fixed-point coring drilling tool can be connected with directional drilling tools of different specifications through fixed rotating coring reducing, the coring drill rod is adopted as a rock core storage device, rock core drilling and cutting are achieved through the coring drill bit, and the drilling efficiency is improved. And under the protection of the fixed-rotation coring reducing device and the section clamping device, the rock core can be complete without leakage. In conventional directional drilling construction, previous directional drilling can be achieved, regional hole section coring can also be achieved, the needed coring drilling tool is small, the coring workload is small, and it can be effectively guaranteed that the coring hole section and the drilling track of directional drilling are controllable. According to the fixed-point coring process, a conventional tunnel directional drilling tool is used for implementing directional drilling operation, and then the fixed-point coring tool is combined for implementing coring operation, so that the rock core can be taken out during directional drilling construction, and the overall construction efficiency is improved.

The invention provides a high dam foundation rock mass quality evaluation method, system and device based on RQD3D and damage and a medium. The method comprises the following steps that S1, a certain depth section of a drill hole or a footrill of a high dam foundation rock area is selected; s2, exploration, geophysical prospecting and testing are carried out on the drill hole or the adit, and all indexes and discontinuous surface geometric parameters needed by RQD3D calculation are collected; s3, proposing a concept of a three-dimensional equivalent rock mass integrity index RQD3D based on a three-dimensional fracture network simulation technology, and performing calculation; s4, the rock mass quality damage coefficient D is calculated based on changes of the sound wave velocities in the rock mass before and after excavation of the high dam foundation and under different water level working conditions; and S5, constructing a calculation formula of rock mass basic quality evaluation, and performing rock mass evaluation according to the assignment of full score 100. According to the evaluation and classification method provided by the invention, the three-dimensional integrity of the rock mass and the dam foundation rock mass quality damage before and after excavation and under different water storage working conditions are considered, evaluation factors are more perfect, and the method is more in line with engineering practice.

The invention relates to the technical field of stratified rock mass numerical simulation, and discloses a stratified rock mass numerical simulation method based on a hybrid progressive failure model, and the method comprises the steps: obtaining an engineering rock mass structural plane of a research area, and grading geological structural planes such as faults, rock veins and fractures of surrounding rock of an underground cavity based on structural plane features; through three-dimensional laser scanning, obtaining the spatial three-dimensional coordinates of each sampling point on the surface of the footrill, obtaining the point cloud of a measured object, and connecting adjacent discrete points; carrying out secondary sampling on the spliced point cloud data, carrying out plane fitting to obtain a structural plane occurrence, and constructing a footrill simulation model; analyzing the occurrence of the structural surface by the footrill simulation model to obtain a stratified rock mass value, and dividing the structural surface in the rock mass into a rigid structural surface and a weak structural surface according to the character, weathering degree, tightness degree and filler condition; and outputting the data to a cloud platform. According to the invention, manual intervention is reduced, and the safety, accuracy and efficiency of measurement are improved.

The invention provides an exploration adit tunneling method based on large-diameter drill holes. The method comprises the steps that lofting is conducted according to the adit axis, and the adit direction and the adit bottom are calibrated; a hole is provided with a movable large-diameter drilling machine platform with a guiding function; combining geological data to pre-judge stratums and partition the stratums; after the hole face is supported, pilot drilling is conducted to the end point through a large drill bit matched with the stratum, and deflection is measured in the whole process; performing grading reaming to a designed hole diameter and correcting deviation; instable sections are recognized in the tunneling process, and immediate supporting is conducted; and cleaning the hole wall and marking the hole depth. The construction precision and safety of adit tunneling can be improved, the construction risk is reduced, and the construction efficiency is improved.

The invention discloses a construction method of a vertical shaft hole-expanding heading machine, which is used for performing hole-expanding drilling on a receiving section rock mass above a lower adit, adjusting heading parameters of the vertical shaft hole-expanding heading machine in stages, standing the vertical shaft hole-expanding heading machine after changing steps, and monitoring thrust fluctuation and deformation conditions of the receiving section rock mass. Dynamically correcting the tunneling parameters, and re-entering the tunneling circulation of the corresponding stage; the slag slipping well and the lower adit cooperatively discharge slag; and synchronously supporting the excavated rock mass. The vertical shaft receiving section construction method is safe, efficient and suitable for complex geology, and the technical problems that when a vertical shaft reaming heading machine conducts construction under the working condition that the bottom of the receiving section is suspended, equipment is unstable, construction efficiency is low, and potential safety hazards exist due to the fact that rock mass is broken and heading parameters are improperly controlled are solved.

The invention mainly relates to the technical field of energy underground storage, and provides a feasibility evaluation method for applying a hydropower station construction adit to a compressed air energy storage underground cavern, and the core of the method is as follows: obtaining adit engineering geological conditions, hydrogeological conditions, shape and size parameters and mechanical property parameters of adit surrounding rock; establishing a three-dimensional numerical model of the compressed air energy storage cavern; according to the method, the boundary and the fixed constraint condition of the three-dimensional numerical model analysis of the gas energy storage cavern are set, the evaluation index is selected, the feasibility of the adit used for the compressed gas energy storage underground cavern under the target operation pressure is evaluated based on the selected evaluation index, and the feasibility of the hydropower station construction adit used as the compressed gas energy storage cavern can be rapidly and conveniently analyzed. And guidance is provided for actual engineering construction.

The application discloses a kind of based on virtual flat adit's slope structural plane model construction method, comprising: generating and each reality flat adit corresponding considering structural plane spatial variability reality flat adit model;Comprehensively consider the geometric characteristics of reality flat adit model and the certainty structural plane feature, generate several considering structural plane spatial variability while considering structural plane along elevation continuity random change virtual flat adit model.The application according to the actual flat adit data of site to the blank area that has not carried out flat adit exploration restores its structural plane feature as far as possible, establishes the structural plane network model in conformity with geological authenticity, to carry out subsequent slope stability evaluation work.The application realizes that the structural plane network constructed in model meets the exposure condition of reality flat adit, while considering the spatial variability of structural plane distribution characteristics in different parts of slope, solves the problem that structural plane model deviates from reality in rock slope numerical calculation and influences the slope stability evaluation.

The invention discloses a novel excavation type fan foundation and a construction method thereof, and belongs to the technical field of land wind power generation engineering, the novel excavation type fan foundation comprises a cylindrical main body foundation pit located underground and a plurality of footrills which are excavated from the side wall of the cylindrical main body foundation pit in the radial direction, and concrete is integrally poured in the foundation pit and the footrills to form an integrated fan foundation structure. During construction, firstly, the cylindrical main body foundation pit is vertically excavated downwards to the designed depth, then a footrill is tunneled on the side wall of the cylindrical main body foundation pit and is supported, then steel bars are bound, and concrete is integrally poured. According to the method, traditional large-area open excavation is changed into an innovative structure of combining the vertical foundation pit with the radial footrill, the earth excavation engineering amount and the land occupied area are remarkably reduced, damage to the environment is reduced, meanwhile, the construction cost is saved, the construction period is shortened, and comprehensive benefits are remarkable.

The method for treating mine wastewater in a roadway by using a multi-stage heavy metal control barrier comprises the following steps: intercepting the outflow of a main stream of mine wastewater in a flat adit mining roadway, so as to raise the liquid level of the mine wastewater and keep the exposed ore-bearing rock stratum and surrounding rock surface below the liquid level of the mine wastewater in an anaerobic state; filling composite organic material filling bodies and composite acid buffer material filling bodies in the roadway in sequence and at intervals, so as to react with the mine wastewater respectively; and sealing the filled roadway, so that the composite organic material filling bodies and the composite acid buffer material filling bodies are completely immersed in the mine wastewater and fully react with the mine wastewater. The method directly controls the mine wastewater generated by the exposed ore-bearing rock stratum and surrounding rock in the flat adit mining roadway, fully utilizes the underground space of a mine, constructs a reaction system in the roadway, realizes in-situ inhibition of the release of heavy metal pollutants, and blocks the migration of heavy metals. The process flow is simple and the operation cost is low.

The present invention discloses a multi-purpose exploration adit layout method. It includes the following steps: Step 1: Drafting the position of the longitudinal tunnel section DOC and determining the positions of points D, O, and C on the adit axis; Step 2: Drafting the position of the transverse tunnel section CB and determining the position of point B on the adit axis; Step 3: Drafting the position of the oblique tunnel section BA and determining the position of point A on the adit axis; Step 4: After the positions of points D, O, C, B, and A have been determined in sequence, the layout of the exploration adit is determined; during actual adit construction, the adit construction excavation is carried out in the reverse order of points A, B, C, O, and D, and the oblique tunnel section BA, transverse tunnel section CB, and longitudinal tunnel section DOC are excavated in this order. The present invention not only realizes the multi-purpose of landslide investigation, sampling, testing, drainage, etc. in the adit, but also has the advantages of safe construction, cost savings, and shortened construction period.

The invention discloses a karst cofferdam vein-shaped water leakage temporary leaking stoppage structure and a construction method.The leaking stoppage structure comprises a flow guide footrill, a flow guide pipe device and an impermeable layer, the flow guide footrill comprises an overflow footrill, a lateral flow guide footrill and a vertical flow guide footrill, the overflow footrill is arranged on the outer side wall of a cofferdam in a sunken mode, and the overflow footrill is arranged in the direction of a water leakage point; the lateral flow guide footrill is arranged below the overflow footrill; the flow guide pipe device comprises lateral flow guide pipes and vertical flow guide pipes, the lateral flow guide pipes are arranged in lateral flow guide footrills, one vertical flow guide footrill is arranged below the water outlet end of each lateral flow guide pipe, and one vertical flow guide pipe is arranged in each vertical flow guide footrill; the impermeable layer is arranged on the outer side wall of the cofferdam and corresponds to the diversion adit. The leaking stoppage structure is simple, convenient to construct and remarkable in leaking stoppage effect; the construction method not only can meet the requirement for excavation of the karst section, but also has important engineering practical significance for leakage prevention and leakage stoppage treatment of related water conservancy projects such as reservoirs in the karst area.

The application discloses a system and method for evaluating rock mass quality in dam site area of a hydropower station, and belongs to the technical field of rock mass detection. The evaluation method evaluates the joint development condition of rock mass in the dam site area through the seepage water characteristics of the adit in the dam site area, and obtains the rock mass quality in the dam site area, and comprises the following steps: according to the joint characteristics of the adit wall in the dam site area, the adit wall is divided into a plurality of sub-regions by using a fence; the seepage water characteristics and water quality characteristics of each sub-region are obtained; the seepage water flow curve and the seepage water quality characteristic curve of each sub-region are obtained; the seepage water flow change rule and the seepage water quality characteristic change rule of each sub-region are obtained; and it is determined whether the joints covered by the sub-regions have internal connectivity. The system is used for realizing the method. According to the regional seepage water measurement based on the joint characteristics of the adit surface, the development state of the rock mass fault and fissure in the dam site area can be accurately obtained, which has promoting significance.

The utility model discloses a pressure tunnel access door dredging device which comprises a pressure tunnel and a construction adit, an access door is arranged at an outlet of the construction adit, a water pump is fixedly arranged at the end, close to the construction adit, of the access door, and the output end of the water pump is connected with a water conveying channel connected with the interior of the access door. The end, away from the water pump, of the water conveying channel communicates with a water storage plate, a plurality of first water spraying pipes are evenly arranged at the bottom end of the water storage plate at intervals, a sand accumulation pool is arranged at the position, below the access door, in the pressure tunnel, a stainless steel frame is arranged at the upper end of the sand accumulation pool, and second water spraying pipes are fixedly arranged on the first water spraying pipes. Flushing water is pumped into the first water spraying pipe and the second water spraying pipe through the water pump, one end face of the sand accumulation pool is flushed through the first water spraying pipe, the other end face of the sand accumulation pool is flushed through the second water spraying pipe, and therefore silt in the sand accumulation pool can be cleaned conveniently.

The invention discloses a flood prevention device for a mine footrill opening and a using method thereof, belongs to the field of mine risk avoiding auxiliary equipment, and solves the problems of low flood prevention working efficiency, low response speed, high labor intensity and poor effect when existing mountain torrents break out. The device comprises a movable support and a flood blocking box, a connecting rod is arranged in the movable support, a lifting assembly is fixedly connected between the flood blocking box and the connecting rod, second connecting rods are symmetrically arranged at the bottom of the movable support, and a movable bracket is arranged between the second connecting rods and the flood blocking box. The using method comprises the steps that a plurality of devices are sequentially placed and flush with the outer wall of a footrill opening, the sealing inserting plates are inserted into the inserting grooves, the multiple flood blocking boxes are connected, a sand wall is formed by the flood blocking boxes, the movable bracket is taken out, the lifting chain block is controlled to fall down, and the flood blocking boxes fall onto the ground and are stored after being used. The flood blocking device is simple in structure, easy and convenient to operate, convenient to use and maintain, wide in adaptability, high in practicability and wide in application and popularization prospect, and flood blocking work can be completed by a small number of workers.

The present invention provides a collapse prevention device for geological adit exploration in water conservancy and hydropower projects, which relates to the technical field of geological adit exploration and includes a water diversion component; the assembly component is installed on the water diversion component; there are two groups of drainage components in total, and the two groups of drainage components are installed inside the water diversion component; there are two groups of cleaning components in total, and the two groups of cleaning components are installed inside the two groups of drainage components; two vertical water diversion grooves A and four horizontal water diversion grooves B are formed on the arched frame; there are two rows of filter screens A in total, and the two rows of filter screens A are fixedly installed in the two vertical water diversion grooves A; there are two rectangular drain pipes in total, and the two rectangular drain pipes are fixedly installed on the left and right sides of the arched frame. This collapse prevention device for geological adit exploration in water conservancy and hydropower projects facilitates the cleaning of blockages in the drainage ditch by workers without affecting the drainage effect.

The utility model discloses a hydraulic structure for avoiding sediment and gravel passing through a pumped storage power station, which relates to the technical field of pumped storage power stations and comprises a tailrace tunnel, one end of the tailrace tunnel is communicated with a downstream surge chamber, and the other end of the tailrace tunnel is communicated with a lower reservoir water inlet / outlet. A slope section is arranged on the bottom wall of the tailrace tunnel, two sets of slag collecting pits are formed in the slope section, a certain distance exists between the two sets of slag collecting pits and a downstream surge chamber, and the end of the tailrace tunnel is connected with a construction adit blocking body. When the device is used, water mixed with silt and gravel enters the reservoir through the downstream surge chamber, the tail water tunnel and the lower reservoir water inlet / outlet in sequence, and the silt and gravel can be automatically intercepted and accumulated in the inner cavity of the slag collecting pit, so that the possible adverse effect of the silt and gravel on the safe operation of a pumped storage power station unit is reduced; a worker enters the tailrace tunnel, and passing conditions are conveniently provided for cleaning silt and gravel in the slag collecting pit.

The utility model discloses a pumped storage power station underground powerhouse double-exhaust shaft structure which comprises an exhaust lower adit, an underground exhaust machine room hole, a bottom connecting hole, an exhaust shaft, an exhaust upper adit and a powerhouse road, the exhaust lower adit is connected with the underground exhaust machine room hole, and the bottom connecting hole is arranged at the tail of the underground exhaust machine room hole and the bottom of the exhaust shaft. The exhaust upper adit is arranged at the top of the exhaust vertical shaft and is adjacent to a factory road, the exhaust vertical shaft comprises a first exhaust vertical shaft and a second exhaust vertical shaft which are arranged side by side, and the diameter of the first exhaust vertical shaft and the diameter of the second exhaust vertical shaft are the same and do not exceed 4.0 m. The two small-section exhaust shafts are arranged, the excavation period of the exhaust shafts is effectively shortened while the exhaust effect is not affected, exhaust in the underground cavern construction period is facilitated, construction conditions are improved, and physical and psychological health and life safety of constructors are facilitated.

The invention provides a plugging structure of a hydraulic tunnel construction adit and a construction method. The plugging structure comprises a tunnel body, the construction adit, an air conditioning chamber, a connecting tunnel and a plugging structure body. A construction adit is arranged on the downstream portion of the tunnel body, the construction adit is divided into an upper construction adit and a lower construction adit which are connected with the upper end and the right end of the air conditioning chamber respectively, and the air conditioning chamber is connected with the tunnel body through a connecting tunnel. The plugging structure comprises five sections. The invention further provides a construction method of the plugging structure. The construction method comprises the five steps of surrounding rock pretreatment, main plugging section construction, transition plugging section construction, auxiliary plugging section construction and quality detection. By means of multi-section differential plugging design and targeted grouting measures, the method effectively adapts to periodic pressure fluctuation of the air cushion type surge chamber, the compactness, impermeability and overall stability of a plugging body are improved, construction parameters are clear, quality is controllable, and the method is suitable for water conservancy project hydraulic tunnel construction adit plugging scenes; and the method has good engineering applicability and economic benefits.

The present invention discloses a right-angle turning method for small-diameter TBM exploration adit excavation and belongs to the field of geological exploration of water conservancy and hydropower projects. The method includes the steps: excavating a main exploration adit with a small-diameter TBM to a designated position, and then enabling the small-diameter TBM to continue to excavate forward to a temporary parking place, and parking the small-diameter TBM there; expanding and excavating a turning workspace at a right-angle turning position, and assembling a rotary platform; pulling the TBM onto the rotary platform, then starting excavation after rotating the rotary platform to make the TBM move in a same direction as the branch exploration adit; and pulling the TBM onto the rotary platform after excavation of the branch exploration adit is completed, and then moving the TBM to an adit portal so as to complete excavation after rotating the rotary platform to make the TBM move in a same direction as the main exploration adit. The present invention effectively solves the problems that the small-diameter TBM can only excavate main exploration adits in geological exploration adits of underground powerhouses of hydropower projects and pumped storage projects, and cannot make right-angle turns and excavate branch adits of underground cavern groups. It effectively fills the blank of a traditional adit excavation adopting blasting technology; and the excavation efficiency is high, the working environment is friendly, and safety production is guaranteed.

The invention provides a large and long tunnel gas pre-extraction method based on a surrounding rock pressure relief principle, and belongs to the technical field of tunnel construction. Drilling from the earth surface to the central area of the tunnel and coal seam intersecting surface to form a footrill; a main roadway is tunneled from the tail end of the footrill, and the trend is adjusted to be parallel to the coal seam inclination direction at the position close to the coal seam; auxiliary roadway networks are tunneled towards the two sides on the basis of the main roadway, and a manual pressure relief space is formed to replace a protective layer; dense crossing drilling holes are constructed in the coal seam in the auxiliary roadway, and hydraulic slotting pressure relief and permeability increase are carried out; and gas is extracted through the roadway network until the standard is reached, and finally grouting plugging is conducted. Complete parallel operation of gas extraction and tunneling is achieved through ground roadway engineering independent of a tunnel main hole, and the construction period is greatly shortened. The gas extraction efficiency and safety of the low-permeability coal seam are improved by combining the manual pressure relief space with hydraulic slotting, and the method is suitable for large and long tunnel engineering penetrating through gently-inclined and inclined high-gas coal seams.

This invention relates to the field of dam construction technology and discloses a method for sealing underground rivers in karst geology, comprising the following steps: Step 1: In the dam construction area, geophysical exploration and drilling techniques are used to confirm the location of underground rivers and karst cave groups that cross the curtain line; Step 2: A grouting adit is set up at the dam foundation to expose the morphology of the underground rivers and karst cavities, detect the flow velocity and flow rate of the underground river, and locate the inflow and outflow points of the underground river within the karst cavity; Step 3: A first collection well is set up to collect the water flow, with its top connected to the grouting adit; a second collection well is set up at the outflow point to collect the water flow, and a backfill grouting pipe is pre-embedded from the grouting adit to the outflow point; Step 4: A pouring hole is drilled at the top of the karst cave, and steel sleeves are installed in the pouring hole from the ground surface to the karst cavity; Step 5: Concrete is poured into the karst cavity through the pouring hole to backfill the cavity, and then the inflow point is sealed. This provides a stable, reliable, highly safe, and effective method for sealing underground rivers.

This utility model provides an escape hydraulic structure for a pumped storage power station combined with a maintenance gate tunnel and a construction adit. It includes an inlet / outlet maintenance gate tunnel, the first end of which connects to the construction adit. The construction adit serves as an escape passage. A staircase is installed inside the inlet / outlet maintenance gate tunnel and connects to the construction adit. This utility model meets the fire safety requirements of the inlet / outlet maintenance gate tunnel. In case of emergency, personnel can escape to a safe area outside the tunnel via the escape passage.

The invention relates to the technical field of tunnel construction, in particular to a low-dip-angle short-distance surrounding rock fracture zone inclined shaft construction method. The inclined shaft is used for communicating an upper adit and a lower adit which are communicated with each other, the gradient of the inclined shaft is 10-30 degrees, and the construction geological condition is surrounding rock class IV and above; the construction method comprises inclined shaft upper portion construction and inclined shaft lower portion construction, the gradient of the inclined shaft upper portion meets the vehicle transportation passing condition, layered construction from top to bottom is adopted, the excavation size is smaller than that of full-section excavation, except the top needs to be supported when the uppermost layer is excavated, the tops of other layers do not need to be supported when the other layers are excavated, the collapse risk is small, and safety is high; during pilot well construction, the well wall is supported, operation safety is guaranteed, during expanding excavation, the lower adit is firstly subjected to block stone backfilling, then expanding excavation is conducted from top to bottom, the construction efficiency is high, and the safety risk is low; after the pilot shaft is communicated from top to bottom, construction water and crack water are discharged into the lower adit through the pilot shaft, and operation under the water-free condition can be achieved.

The invention provides a high access step type continuous stoping subsequent filling mining method, and belongs to the technical field of metal mine mining, the mining method comprises the following steps: tunneling a lower layered operation space of an initial stoping unit, carrying out top-lifting construction on an upper layered operation space, and piling up a ramp; stoping the upper layer and then the lower layer until the end; after a goaf is formed through stoping, top-contact-free filling is conducted for the first time, and a circulating operation space is reserved; a first avoiding chamber is tunneled in the cyclic operation space, a lower layered operation space of a next stoping unit is constructed in a top-picking mode, and then the cyclic operation space is filled; a second avoiding chamber is tunneled, a layered operation space on a next stoping unit is constructed in a top-lifting mode, and a ramp is built in a heaping mode; and after the upper layer is stoped, the lower layer is stoped until the lower layer is communicated with the draw shaft, and the rest part of the upper layer is stoped after a third avoiding chamber is tunneled. And after stoping, adopting non-roof-contact filling and reserving a circulating operation space, repeating the working procedures until stoping is finished, and fully filling the last goaf. And efficient mining is achieved by optimizing the stoping and filling process.

The application provides a flat adit geological structure surface occurrence calculation method, device, equipment and medium, relates to the technical field of structure surface occurrence calculation; the method comprises the following steps: obtaining three-dimensional point cloud data of the flat adit; obtaining a three-dimensional central axis point set of the flat adit; constructing a fitting circumscribed circle for projection; obtaining two-dimensional unfolded plane point cloud data; obtaining a flat adit two-dimensional plane image; obtaining a flat adit structure surface trace; obtaining three-dimensional point cloud data of the structure surface trace; based on the three-dimensional point cloud data of the structure surface trace, the principal component analysis method is used for processing, a fitting plane is obtained; based on the fitting plane, structure surface occurrence parameter information is obtained; the method of the application can efficiently and safely calculate the structure surface occurrence through point cloud, can quickly obtain dense area data, is especially suitable for dangerous or complex terrains that are difficult for people to reach, and can significantly improve the geological information acquisition efficiency and accuracy through automatic processing to ensure high precision and objectivity of the result.

The invention discloses a gold ore prospecting method based on biotite alteration mineral mapping, which comprises the following steps: (1) according to pit exploration, drilling and surface outcrop conditions of a gold ore exploration area, systematically collecting representative samples containing mineralized alteration biotite on a contact zone of an ore body and surrounding rock; (2) grinding the alteration zone sample into a probe sheet, analyzing through an electronic probe to obtain the main component of biotite, calculating the alteration strength parameter Mg / (Mg + Fe) atomic ratio and the like of biotite, and calculating the mineralization alteration temperature by using a biotite Ti thermometer; and (3) based on the sampling position, carrying out space mapping on the alteration intensity and the alteration temperature, and delineating a prediction region with high alteration intensity and high alteration temperature as a deep edge prospecting target region according to the disclosed positive correlation between the biotite alteration intensity and the ore body thickness and between the alteration temperature and the ore body grade.

This invention provides a method for excavating an underground cavern in a power plant and the underground cavern itself, relating to the field of hydraulic engineering technology. The underground cavern includes a main transformer tunnel, a main power plant, and a busbar tunnel, with the busbar tunnel connecting the main transformer tunnel and the main power plant. The underground cavern also includes a construction adit. The excavation method for the underground cavern includes the following steps: excavation work is carried out on the upstream side of the bottom of the main transformer tunnel to form a construction adit; at least part of the excavation work of the busbar tunnel is carried out through the construction adit in parallel with at least part of the excavation work of the main power plant; the busbar tunnel and the main power plant are excavated to connect, and the intersection area of ​​the busbar tunnel and the main power plant is reinforced with support. This invention can effectively improve the overall construction progress and efficiency of the underground cavern.

The present invention relates to the field of abandoned mine reuse and pumped storage, and specifically to a method for pumped storage using abandoned open-pit mines and underground mines; the method comprises the following steps: a. constructing auxiliary adit and grouting boreholes from the wellbore, and grouting to reinforce the collapsed zone and the water-conducting fracture zone; the auxiliary adit is located in the thick hard rock layer above the water-conducting fracture zone; b. constructing an upper diversion tunnel from the wellbore to the collapse pit; c. constructing a tailwater tunnel from the wellbore to the open-pit mine; d. constructing an upper reservoir and a lower reservoir. Subsequently, a surge chamber and an electromechanical chamber are constructed; and then the grouting boreholes and the auxiliary adit are closed. Finally, the wellbore portion above the upper diversion tunnel is closed, and the upper diversion tunnel, the tailwater tunnel, and the wellbore section between the two connect the upper reservoir and the lower reservoir. The present invention can carry out multiple construction processes in parallel, reduce the construction workload of the upper and lower reservoirs, ensure the stability of the upper reservoir constructed based on the collapse pit, and greatly reduce the construction period and cost.

This invention discloses a water-stopping structure for a structural joint in an earth-rock dam gallery, relating to the field of water conservancy and hydropower engineering technology. It includes surrounding rock, a grouting adit, and a foundation gallery. A structural joint is provided between the grouting adit and the foundation gallery. A concrete water-stopping base is located at the bottom of the foundation gallery. A water-stopping structure is provided on the structural joint, comprising a first copper water-stop and a second copper water-stop. This invention uses two copper water-stops in the structural joint, with the first copper water-stop embedded in the concrete water-stopping base at the bottom, thus improving the seepage prevention reliability of the structural joint.