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117 results about "Rock pressure" patented technology
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Rock Pressure. the pressure on the liquid (petroleum, water) and gas that saturate the pore space or cracks of reservoirs in oil and gas fields. Rock pressure is an important parameter characterizing the energy of oil-, gas-, and water-bearing beds.
Grouting and filling equipment for water-preserved mining of coal mine
The invention provides grouting and filling equipment for water-preserved mining of a coal mine, and relates to the technical field of mining equipment, and the grouting and filling equipment comprises a base frame piece, a grouting guide pipe piece, a slurry post-processing assembly and a plugging driving assembly. A plurality of groups of outer ring parts with hole wall pressure sensors are arranged on the outer wall of the grouting guide pipe piece, and a pipe end micro sensor is arranged at the grout outlet end; the inserting and pulling driving assembly drives the stirring assembly to push the outer ring part through the motor, and inserting and pulling of the grouting guide pipe piece are controlled. During working, the guide pipe piece is inserted into a grouting hole to a goaf, the sensor monitors rock mass pressure, temperature and sound wave signals in real time, the grouting pressure is dynamically adjusted in combination with formation resistance, and grout fluid channeling or insufficient filling is avoided. Through precise pressure regulation and automatic insertion and extraction, the problems of material waste, underground water pollution and insufficient goaf filling in traditional grouting are solved, and the environmental protection property and the engineering efficiency of water-preserved mining are remarkably improved.
Owner:SHANXI XINZHOU SHENDA ENERGY GRP CO LTD
Method for reinforcing mined-out side concrete wall of coal pillar in mining section
The invention discloses a mining section coal pillar goaf side concrete wall reinforcing method, and relates to the field of coal mining, and the method comprises the following steps: collecting section coal pillar geological parameters; calculating a boundary position of a plastic zone according to geological parameters of the coal pillar, and dividing the coal pillar into a broken zone, a fractured zone and an original structure zone; basic roof strata are determined according to geological parameters of the coal pillar, the bearing capacity of the basic roof strata is calculated, the basic roof strata with the minimum bearing capacity serves as a roof cutting target layer, and the hydrofracture roof cutting drilling depth needed for penetrating through the target layer is determined; the broken area range serves as the influence range of surrounding rock pressure calculation, the static load q applied to the concrete wall by the surrounding rock pressure is calculated, the static load q is corrected through a dynamic load coefficient, and a supporting load Q is obtained; and according to the support load Q, reinforcement parameters are determined. Aiming at the surrounding rock deformation and instability of the adjacent roadway on the section coal pillar gob side under the deep well mining condition, the method effectively controls the surrounding rock deformation and instability of the adjacent roadway caused by working face mining disturbance.
Owner:SHANXI HUIAN YONGTAI MINING TECH CO LTD
Railway tunnel active support rock anchoring and shotcreting synergistic effect space-time design method considering space-time effect
The invention particularly discloses a time-space design method for a railway tunnel active support rock anchoring and shotcreting synergistic effect considering a time-space effect, and relates to the technical field of civil engineering. The method comprises the steps that firstly, expression characteristics of the load time effect, the material time effect, the tunnel face space effect and the rock anchor bearing arch space effect of active supporting are determined, a space-time effect characterization method is established, and then a tunnel active supporting rock anchor and shotcrete synergistic effect space-time calculation model is constructed; then determining calculation parameters of a rock anchor bearing arch and a sprayed concrete layer, and constructing a surrounding rock pressure calculation method and a safety evaluation method considering the advance support effect; and finally, according to a calculation result of the tunnel active support rock anchoring and shotcreting synergistic effect space-time calculation model, safety is judged, and design parameters of a pre-stressed anchor rod and shotcreting concrete are determined. The method can simply, quickly and accurately calculate the internal force distribution and safety of the tunnel rock anchor bearing arch and the sprayed concrete layer under different time, geological conditions and support design parameters, and has good engineering value.
Owner:CHINA RAILWAY ECONOMIC & PLANNING RES INST
Tunnel trolley supporting system and method intelligently adapting to geological conditions
The invention discloses a tunnel trolley supporting system and method intelligently adapting to geological conditions, and belongs to the technical field of tunnel safety supporting. The device comprises a supporting truss, a rigid supporting mechanism and a flexible supporting mechanism. Wherein the flexible supporting mechanism comprises an air bag which is used for preliminarily supporting the surrounding rock of the tunnel; the rigid supporting mechanism comprises a mounting frame, a plurality of air chambers are arranged in the mounting frame, and adjusting assemblies are arranged in the air chambers; the adjusting assembly comprises a piston plate and a piston rod located on the piston plate, and the free end of the piston rod penetrates through the mounting frame, then extends into the air bag and is connected with a supporting plate. The supporting plates are used for carrying out secondary supporting on the tunnel surrounding rock from the interior of the air bag, the supporting pressure of each supporting plate can be adjusted through the inflation pressure in the corresponding air chamber so as to adapt to different geological conditions, good self-adaptive capacity is achieved, and dynamic distribution of the surrounding rock pressure is achieved.
Owner:CHINA MCC17 GRP CO LTD
Dynamic design method for TBM tunnel supporting structure
PendingCN120724554AGeometric CADDesign optimisation/simulationArchitectural engineeringRock pressure
The invention discloses a dynamic design method for a TBM tunnel supporting structure, which belongs to the technical field of tunnel construction and comprises the following steps: S1, calculating supporting stiffness generated by different supporting operations according to actual tunnel surrounding rock parameters, supporting parameters and construction procedures, and calculating virtual supporting force; s2, constructing a two-dimensional plane strain model, substituting the support rigidity obtained in the step S1 into the model to calculate final settlement of the tunnel, and obtaining reasonable surrounding rock parameters required by numerical simulation under the surrounding rock condition of the tunnel; and S3, three-dimensional rough hole excavation model calculation is carried out, a surrounding rock pressure release rule is obtained, supporting resistance is adjusted by adjusting supporting parameters, and optimal selection of the supporting parameters is carried out while the surrounding rock pressure release rule is met. According to the dynamic design method for the TBM tunnel supporting structure, the supporting scheme can be adjusted according to different surrounding rock parameters, so that the supporting design is more efficient, the construction cost is effectively reduced, and the construction efficiency and the supporting quality are improved.
Owner:CHINA RAILWAY ECONOMIC & PLANNING RES INST +3
Tunnel surrounding rock pressure arch calculation system
The invention, which belongs to the technical field of tunnel engineering, discloses a tunnel surrounding rock pressure arch calculation system comprising a multi-source data fusion acquisition module, a surrounding rock grade intelligent identification module, a self-adaptive pressure arch parameter calculation module and a dynamic load prediction and optimization module. The multi-source data fusion acquisition module acquires geological parameters, drilling monitoring data and case data and generates fusion feature vectors; the surrounding rock grade intelligent identification module outputs a surrounding rock classification result based on a deep residual network and an attention mechanism; the self-adaptive pressure arch parameter calculation module calculates pressure arch parameters by adopting an improved Prscherski theory and a stress release time-varying function; the dynamic load prediction and optimization module predicts the load through the space-time collaborative network and feeds the deviation back to the calculation module to form closed-loop optimization, precise dynamic calculation of the surrounding rock pressure arch parameters is achieved, and the calculation precision is improved by 20% or above compared with a traditional method.
Owner:徐超
Surrounding rock pressure calculation method for multi-arch tunnel without middle pilot tunnel
The invention provides a surrounding rock pressure calculation method for a multi-arch tunnel without a middle pilot tunnel, belongs to the technical field of highway tunnel engineering, solves the problem that an existing calculation method cannot express actual stress characteristics of the multi-arch tunnel without a middle wall, and comprises the following steps: establishing a surrounding rock pressure load distribution model of the multi-arch tunnel without the middle pilot tunnel; respectively calculating basic loose pressures qf and qr according to the established distribution model; adding loose pressure qz; adding loose pressure qa, qaf, qar and qz; and the lateral horizontal pressure ef, er, ewf and ewr. According to the method, the distribution and the size of the surrounding rock pressure acting on the lining structure of the buried-depth multi-arch tunnel without the middle pilot tunnel are determined, the stress of the lining structure is analyzed, structural checking calculation is carried out, and necessary theoretical support is provided for evaluating and optimizing the structure.
Owner:GANSU PROVINCE TRANSPORTATION PLANNING SURVEY & DESIGN INST
Intelligent operation method and system for double-arm drill jumbo of large-section tunnel
The invention discloses an intelligent operation method and system for a double-arm drill jumbo of a large-section tunnel, and relates to the field of tunnel construction, the geometry, integrity, dust and humidity data of a section are collected in real time through a laser radar, an IMU and a surrounding rock pressure and environment sensor, and an operation environment database is constructed and updated; by combining the strength grade of the surrounding rock and the distribution of the soft layer, the posture of the arm support, the chiseling frequency and pressure and the rock entering angle of the bucket teeth are adjusted online in a self-adaptive mode; switching among a high-frequency impact mode, a bucket tooth wedging prying mode and a free face gravity automatic rock breaking mode according to working conditions; excessive impact is restrained and protection is triggered through a vibration monitoring closed loop, efficiency is improved, energy consumption is reduced, secondary damage is reduced, and construction safety and quality are guaranteed.
Owner:SOUTHWEST JIAOTONG UNIV
Soft rock gully section tunnel deformation monitoring method
The invention provides a soft rock gully section tunnel deformation monitoring method, which belongs to the field of tunnel construction deformation monitoring, and comprises the following steps: selecting a typical monitoring section of an ultra-shallow buried large section tunnel, and arranging a plurality of groups of measuring points on an arch crown, an arch shoulder, a haunch, an arch foot and an arch bottom; a high-precision total station is adopted to collect vault settlement and cavern periphery convergence data in real time, and meanwhile, the monitoring frequency is dynamically adjusted based on the displacement rate; measuring the pressure change of the surrounding rock through the intelligent string-type double-membrane soil pressure box; the stability of the surrounding rock is judged, obtained data are analyzed and processed, and the vault settlement deformation cumulant, the settlement growth rate and the pressure distribution characteristics of the surrounding rock are obtained; calculating and predicting the final settlement amount and the peripheral convergence value of the vault through a fitting formula; and drawing a surrounding rock deformation envelope line through the surrounding convergence change values, and carrying out confluence analysis on surrounding rock pressure change to obtain a surrounding rock pressure envelope line, so as to reveal the form evolution and pressure distribution rule of the surrounding rock cavity of the tunnel. According to the method, the engineering safety and efficiency are remarkably improved.
Owner:XINJIANG CONSTR RES INST (CO LTD) +1
A soft rock roadway surrounding rock pressure-relief-grouting collaborative support control system
The application relates to the technical field of soft rock roadway surrounding rock supporting, and discloses a soft rock roadway surrounding rock pressure-releasing-grouting cooperative supporting control system which comprises a pressure-releasing part and a grouting part; the grouting part is used for grouting reinforcement of near-field surrounding rock of the soft rock roadway; pressure-releasing holes are uniformly arranged in the inner wall of the surrounding rock of the roadway; the pressure-releasing part is used for pressure-releasing treatment of far-field surrounding rock in the pressure-releasing holes; the pressure-releasing part comprises a steel pipe; the bottom end of the steel pipe is connected with a conveying pipe; the other end of the conveying pipe is connected with a high-pressure pump; a buffer mechanism is arranged at the lower part of the outer wall of the steel pipe and is used for buffering when the steel pipe releases pressure at the pressure-releasing holes by using the high-pressure pump; and a supporting mechanism is arranged at the outer wall of the steel pipe located in the pressure-releasing holes. The pressure-releasing part and the grouting part are matched, the stress of far-field surrounding rock of the soft rock roadway is effectively released, the stability of near-field surrounding rock of the soft rock roadway is further improved, and the cooperative control effect of pressure-releasing of far-field surrounding rock and grouting reinforcement of near-field surrounding rock of the soft rock roadway is realized.
Owner:宁夏红墩子煤业有限公司
Fault rock compaction diagenesis burial depth determination method and device based on shale content of surrounding rock
The invention relates to the technical field of fault type oil and gas reservoir evaluation, in particular to a fault rock compaction diagenesis burial depth determination method and device based on the shale content of surrounding rock, and the method comprises the steps: obtaining fault rock and surrounding rock of a target layer in a research area and burial depth related parameters; a fault rock compaction diagenesis degree index is determined according to the fault rock and burial depth related parameters, and a surrounding rock compaction diagenesis degree index is determined according to the surrounding rock and burial depth related parameters, or after the surrounding rock shale content in the surrounding rock and burial depth related parameters is replaced with the fault rock shale content, the surrounding rock compaction diagenesis degree index is determined according to the fault rock shale content; and drawing a relational graph of the compaction diagenesis degree index of the surrounding rock and the compaction diagenesis burial depth of the surrounding rock, projecting the compaction diagenesis degree index of the fault rock into the relational graph, and determining the compaction diagenesis burial depth of the fault rock. The method breaks through the limitation of the existing method for determining the fault rock compaction diagenetic burial depth technology, and can provide an effective means for accurate discovery, exploration and deployment of oil and gas in the oil and gas containing basin fault type oil and gas reservoir.
Owner:NORTHEAST GASOLINEEUM UNIV
A method for evaluating different formation dip shale gas reservoirs for rate of transmissibility
This invention relates to a method for evaluating the escape rate of shale gas reservoirs with different dip angles, employing the following technical solution: including the following steps: Step (1) Calculate the drilling angle θ of the plunger sample based on the shale bedding type, calculate the length L of the plunger sample based on the plunger diameter d, and drill the plunger sample based on the drilling angle θ and length L; Step (2) Test the minimum starting pressure P0 of the plunger sample using methane gas; Step (3) Calculate the fluid pressure P of the formation where the plunger sample is located. 流 hydrostatic pressure P 水 Minimum starting pressure P0 and static rock pressure P 岩 Calculate the test pressure Δ for permeability testing p and confining pressure P 围 Step (4) is performed according to the test pressure P determined in step (3). 测 and confining pressure P 围 The permeability of the plunger sample is tested to obtain the permeability k; step (5) calculate the gas escape rate R; step (6) evaluate the shale gas escape capacity of the layer where the sample is located based on the gas escape rate R. The larger the escape rate R is, the stronger the shale gas escape capacity is. Then calculate the shallowest burial depth H where the layer where the sample is located can be effectively preserved.
Owner:CHINA PETROLEUM & CHEMICAL CORP +1
Data-driven method for inferring the safety status of tunnel structures
This disclosure provides a data-driven method for inferring the safety status of tunnel structures, applicable to the field of tunnel engineering safety assessment. The method includes: establishing a crack description feature set; calculating the remaining bearing capacity of the lining corresponding to different crack types in the crack description feature set using an extended finite element model, obtaining a set of remaining bearing capacity results for the lining; using the crack description feature set as training samples and the set of remaining bearing capacity results as annotations; training a prediction model for the remaining bearing capacity of the lining based on the training samples; inputting the crack description feature set corresponding to the remaining bearing capacity of the lining to be predicted into the trained prediction model to obtain the predicted remaining bearing capacity of the lining; obtaining the surrounding rock pressure by testing the tunnel support force, calculating the ratio of the surrounding rock pressure to the predicted remaining bearing capacity of the lining, and obtaining the lining safety level and the tunnel structure safety level. This improves the comprehensiveness and accuracy of the safety assessment and makes the evaluation results more objective and realistic.
Owner:SHIJIAZHUANG TIEDAO UNIV +1
Metal mine high-stress stratum ultra-deep vertical shaft elliptical lining supporting structure and method
The invention relates to the technical field of engineering support of metal mine high-stress stratums, in particular to a metal mine high-stress stratum ultra-deep vertical shaft oval lining support structure and method.The metal mine high-stress stratum ultra-deep vertical shaft oval lining support structure comprises an oval vertical shaft wall and a composite support system, and the composite support system comprises an initial flexible support, a shaft outer lining and a shaft inner circular lining; the long axis of the oval well wall is arranged in the maximum horizontal principal stress direction of primary rock stress. A traditional round shaft is changed into an oval shaft, the long axis extending direction of the oval shaft is kept consistent with the maximum principal stress direction, the tensile stress area is effectively expanded to the two sides of the long axis, the surrounding rock pressure is effectively released, after optimization, stress distribution is remarkably improved, the maximum principal stress is dominated by pressure stress, and the stress distribution is reduced. Compared with a traditional circular structure, a more reasonable stress state is realized; the minimum principal stress is also greatly reduced after filling, and the overall stress performance is remarkably improved.
Owner:DEEP MINING LABORATORY BRANCH OF SHANDONG GOLD MINING TECHNOLOGY CO LTD
Goaf end interval unequal-strength filling pressure-bearing roadway protection method
The invention relates to the technical field of pressure relief control of adjacent goaf coal roadways, in particular to a goaf end interval unequal-strength filling pressure-bearing roadway protection method. The roadway protection method comprises the following steps: firstly, determining a bearing pressure distribution function under the mining condition of a complete caving method, then determining a stress rising area as a filling area, and determining a filling body strength analytical expression; and finally, filling schemes corresponding to different filling degrees are designed according to a strength analysis formula of the filling body, numerical simulation checking calculation is carried out on the different filling schemes one by one, and the economic and reasonable optimal filling scheme is finally obtained under the condition that it is guaranteed that the filling body has enough strength. According to the filling scheme obtained through the roadway protection method, the distribution condition of bearing pressure is followed, the filling body has enough supporting strength, and the minimum filling amount is adopted to obtain the optimal filling scheme; on the basis of ensuring a better control effect on overlying strata, the method also has lower construction cost, and is beneficial to being widely used in the field of coal rock pressure relief of adjacent mined areas.
Owner:HENAN POLYTECHNIC UNIV
Deformation Response-Based Method and Apparatus for Assessing the Service Status of Tunnel Lining
This invention provides a method and apparatus for evaluating the service status of tunnel lining based on deformation response. After the tunnel is put into operation, without calculating the increment or total amount of surrounding rock pressure or load after operation, it is possible to determine the lining crack width and safety factor, and evaluate or analyze the secondary lining service status and its variation law at any service time of the tunnel. The method includes: Step 1, determining the displacement increment u2 of the tunnel from the time of commissioning or acceptance to a certain tunnel maintenance time t under the service status; Step 2, establishing a load structure model of the tunnel; Step 3, applying displacement directly to the load structure model based on the displacement increment u2, fixing constraints on all element nodes, and calculating the internal forces of the structure; Step 4, obtaining the safety factor and crack width of the element based on the internal forces of the element; Step 5, evaluating the service status of the tunnel at the tunnel maintenance time t based on the safety factor and crack width.
Owner:WUHAN UNIV OF TECH
A movable support structure for underpass tunnels
ActiveCN224282670USimplify the installation processImprove efficiencyProps/chocksHydraulic cylinderArchitectural engineering
This utility model relates to the field of tunnel construction equipment technology, and in particular to a mobile support structure for underpass tunnels. It includes a base, baffles for tunnel support, a gantry frame with hydraulic cylinders, and positioning rods circumferentially distributed and extending underground fixedly installed on the base. Four circumferentially distributed support rods are also provided on the base. This utility model features clamping blocks to clamp the positioning blocks using a clamping structure, eliminating the need for bolts, simplifying the installation process, and improving efficiency. The baffles supporting the tunnel evenly distribute the surrounding rock pressure, preventing local collapse or deformation. The fastening structure allows for quick-disassembly of the baffles, eliminating the need to remove all baffles, only the target area, reducing construction interference. The automatically lifting support frame that supports the baffles can adjust the support height in real time according to the tunnel construction progress, maintaining effective support force on the baffles at all times, and improving the safety of construction operations.
Owner:ANHUI HIGHWAY BRIDGE ENG CO LTD
Determination method, device and equipment for pressure maintaining gas content of deep coal rock and storage medium
PendingCN121410805AAnalysing solids using sonic/ultrasonic/infrasonic wavesProcessing detected response signalLithologySingle sample
The invention discloses a deep coal rock pressure maintaining gas content determination method, device and equipment and a storage medium, and belongs to the technical field of well logging. According to the method, a rock core in a pressure maintaining barrel is segmented according to lithology on the basis of the correlation between the occurrence state of coal rock analytic gas and the pore structure of a coal rock reservoir, then the integral cut weighting coefficient of the pressure maintaining gas is determined, and the content of the pressure maintaining gas in a single sample is further obtained. The testing method can provide more accurate and reliable pressure-maintaining gas content data of the deep single coal rock, is applied to evaluation work of the gas content of the deep coal rock, and provides a basis for accurately calculating the total gas content of the single coal rock, delineating a favorable exploration area and improving the success rate of natural gas exploration and development.
Owner:PETROCHINA CO LTD
Treatment System and Construction Method for Arching Defects in Operating Tunnels in Underlying Karst Formations
This invention provides a system and construction method for treating arching defects in the pavement of operating tunnels located in underlying karst strata. The tunnel lining is pre-reinforced by installing an arc-shaped I-beam internal support frame. The height and tension of the I-beam internal support frame are adjusted using longitudinal steel beams. After pre-reinforcement, the concrete pavement layer and the underlying broken rock layer are excavated, and the middle section of the tunnel invert is poured. The surrounding rock pressure is transferred to the middle invert via the supporting steel frame. The surrounding rock at the arch foot is then excavated, and concrete is poured to form a closed structure, transferring the tunnel's surrounding rock pressure to the invert. After the closed invert is constructed, the concrete lining is reinforced using a combination of "W-shaped steel strip + anchor grouting + sprayed steel fiber concrete" to solve problems such as cracking, heave, deformation, and voiding in the operating tunnel. Grooves are cut at the transverse expansion joints where water seepage occurs, and channel steel is pre-embedded in the grooves as a water guiding channel to promptly drain seepage water from the pavement into the drainage ditches on both sides.
Owner:HANGZHOU JIANGRUN TECH LIMITED
An asymmetric non-mid-wall connected arch tunnel support system
The utility model discloses an asymmetric non -middle wall connected arch tunnel support system relates to tunnel support technical field, including connected arch tunnel first -pass hole initial support, connected arch tunnel first -pass hole initial support includes I20a type steel arch frame, inside phi 8 steel bar net, outside phi 8 steel bar net, steel arch frame connecting reinforcing steel bar, big arch foot reinforcing cage, big arch foot steel arch frame triangle bracing structure, big arch foot steel arch frame connecting steel sheet and stiffened steel plate, through the first -pass hole initial support of setting, first -pass hole initial support adopts I20a type steel arch frame, inside phi 8 steel bar net, outside phi 8 steel bar net, steel arch frame connecting reinforcing steel bar, big arch foot reinforcing cage, big arch foot steel arch frame triangle bracing structure, connecting steel plate and stiffened steel plate, form high -strength, high rigid support system, effectively disperses the surrounding rock pressure, reduces local damage, and system anchor rod and radial injection grouting small catheter consolidate surrounding rock through injection grouting, further enhances the stability of surrounding rock.
Owner:GANSU PROVINCE TRANSPORTATION PLANNING SURVEY & DESIGN INST
Roadway mine pressure early warning method, device, system and electronic equipment
The application provides a roadway rock pressure early warning method, device and system and electronic equipment, and relates to the technical field of roadway rock pressure early warning. The method comprises the following steps: obtaining stress data and microseismic data of a roadway; inputting the stress data and the microseismic data into a roadway rock pressure early warning model to obtain a roadway rock pressure early warning index output by the roadway rock pressure early warning model; the roadway rock pressure early warning model is trained based on sample data pairs and sample true rock pressure labels of the sample data pairs; the sample data pairs comprise sample stress data and sample microseismic data; and the rock pressure early warning grade of the roadway is determined based on the roadway rock pressure early warning index. The application is used to solve the problem that the existing single stress or microseismic monitoring cannot fully capture the complete precursor information chain of strong rock pressure incubation due to "false alarm" and "missed alarm".
Owner:CHINA ENERGY GRP NINGXIA COAL IND CO LTD +1
Optimization method for calculating surrounding rock pressure of deep buried four-hole tunnel with small clearance
The present invention relates to the technical field of surrounding rock pressure calculation, and in particular, to a method for optimizing the calculation of surrounding rock pressure of a deep-buried four-hole tunnel with a small net spacing. The method comprises the following steps: collecting geological parameters and support parameters; calculating the radius of the anchor reinforcement zone based on the geological parameters and support parameters; calculating the synthetic surrounding rock contact pressure value based on the radius of the anchor reinforcement zone using dynamic plastic superposition, introducing a porosity attenuation factor to quantify the influence of the pore structure on the rock mass stiffness in the process of calculating the synthetic surrounding rock contact pressure value, and introducing a gradation correction coefficient to optimize and dynamically adjust the sensitivity of the plastic zone expansion to the particle gradation; establishing a graded contact pressure correction model to correct the contact pressure error caused by the interference of multiple caverns to obtain the optimized surrounding rock contact pressure value. The design of the present invention comprehensively considers the mutual influence between multiple caverns, the synergistic effect of the support structure, and the dynamic changes during the construction process, and introduces the dynamic plastic superposition theory, dual-field coupling stress analysis, and a graded correction model.
Owner:WENZHOU TRANSPORTATION PLANNING & DESIGN RES INST CO LTD
Core drilling device and process method for pressure-maintained surrounding rock coring
The application discloses a coring device and process method for surrounding rock pressure-keeping coring, and belongs to the technical field of geological exploration process equipment design and manufacturing. The coring device and process method can make the rock core keep the original stress state as much as possible. The coring device comprises a sampling, cutting and deslagging assembly, a cushioning and spouting coating system and a pressure-keeping and pressurizing system. In the sampling process of the rock core, the cushioning and spouting coating system and the pressure-keeping and pressurizing system sequentially follow the sequentially progressive order, and the cutting groove cut by the sampling, cutting and deslagging assembly is used to spout the cushioning coating layer to the surface of the cut part of the rock core by means of occupation spouting and occupation pressurizing, and the pressure-keeping stress is applied to the rock core which has been cut and coated with the cushioning coating layer under the cooperation of the surrounding rock on the other side of the cutting groove.
Owner:CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
I-shaped steel supporting structure capable of achieving yielding and monitoring
Owner:CHINA MINMETALS CHANGSHA MINING RES INST
A method for partitioned and coordinated fracturing of hard roof of thick coal seam in deep mine
The application discloses a kind of deep-buried mine thick coal seam hard roof partitioned cooperative fracturing method.Working face hard roof breakage position is determined, according to hard thick roof constraint boundary condition, the position of roof breakage is determined;Affected by the goaf of last working face, the roof of mining working face presents different boundary conditions on its two side coal pillars, wherein simply supported is formed at the section coal pillar of empty side, solid side section coal pillar forms fixed support, while the roof in goaf is difficult to form hinged structure, according to the layout of adjacent working face, the hard thick roof is regarded as a whole, different fracturing means are used in empty side and solid side roadway, and partitioned pressure relief is implemented, hydraulic fracturing fracturing method is implemented in the roadway of empty side of working face, and blasting fracturing method is implemented in the roadway of solid side.The application will solve the problem of hard thick roof strong rock pressure prevention and control in deep-buried mine thick coal seam, help to prevent and control the appearance of deep-buried mine strong rock pressure, and can also scientifically control the sudden instability of hard thick roof breakage.
Owner:YANAN UNIV +1
A shallow-buried bias layered soft rock tunnel support scheme generation method and system
PendingCN122263032AEnsure construction safetyQuality assuranceMining devicesCharacter and pattern recognitionRock tunnelComputer vision
The application provides a shallow-buried bias layered soft rock tunnel support scheme generation method and system, relates to the tunnel support technical field, and comprises the following steps: acquiring multi-source monitoring data and construction parameters in tunnel construction in real time; intelligently identifying and processing the large deformation grade of the tunnel based on the data, extracting visual features from the image of the tunnel face, fusing and comprehensively analyzing the visual features, surrounding rock pressure, support structure internal force, deformation around the hole, distributed strain and construction parameters, and obtaining the large deformation grade of the current section; based on the large deformation grade, multi-source monitoring data and construction parameters, performing case retrieval on a preset support knowledge base to obtain a candidate support scheme set for the current working condition; and performing decision selection processing on the candidate support scheme set to select the scheme with the highest current benefit as the optimal support scheme. The application improves the control ability and decision efficiency of large deformation risk in shallow-buried bias layered soft rock tunnel construction.
Owner:SOUTHWEST JIAOTONG UNIV
Large and long tunnel gas pre-extraction method based on surrounding rock pressure relief principle
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.
Owner:HUNAN UNIV OF SCI & TECH
A safety checking method for a mine method excavated arch wall assembled tunnel structure
ActiveCN115203781BGeometric CADDesign optimisation/simulationArchitectural engineeringBending stiffness
The present invention provides a safety calculation method for an arch-wall prefabricated tunnel structure excavated using the mining method. The method first determines the tunnel surrounding rock pressure and the load sharing ratio, establishes a beam-spring load structure model, determines the load combination for the beam-spring load structure model, calculates the load results under different load combinations, and finally performs a safety calculation on the lining structure. The present invention analyzes prefabricated composite linings based on the New Austrian Tunneling Method (NATM). It simulates the stresses on the lining structure using a summarized empirical formula, resolving the principle of the load sharing ratio between primary support and secondary lining. It also simulates the bending stiffness of the lining sheet joints and proposes an empirical formula for the lining sheet joints. This method achieves a calculation method that is closer to the mining method prefabricated tunnel lining, is more valuable as a reference, and ensures project safety.
Owner:CHINA RAILWAY 11TH BUREAU GRP CORP LTD +1
A method for calculating the surrounding rock pressure at the portal of a shallow-buried, unbalanced-pressure tunnel
ActiveCN120470813BGeometric CADDesign optimisation/simulationClassical mechanicsStructural engineering
The present application provides a method for calculating the surrounding rock pressure at the portal of a shallow-buried biased tunnel in a bedding layer, which relates to the technical field of tunnel design. The method includes: constructing a surrounding rock pressure model of a shallow-buried biased tunnel in a bedding layer; decomposing the outer block and the inner block into multiple stratum blocks by layer based on the stratum interface of the bedding rock mass; determining the first side resistance resultant of the outer block and the second side resistance resultant of the inner block in layers; determining the target gravity of the rock column directly above the tunnel based on the weight of the block at the top of the tunnel, and determining the first vertical surrounding rock pressure and the first horizontal surrounding rock pressure on the outside of the tunnel, and the second vertical surrounding rock pressure and the second horizontal surrounding rock pressure on the inside of the tunnel based on the target gravity, the first side resistance resultant, and the second side resistance resultant. This method can improve the calculation accuracy of the surrounding rock pressure of a bedding biased tunnel in a complex stratum by solving the side resistance resultant of the stratum blocks layer by layer.
Owner:SICHUAN HIGHWAY PLANNING SURVEY DESIGN AND RESEARCH INSTITUTE LTD
Method for determining the axis of a high internal pressure chamber
ActiveCN115828656BSurrounding rock pressure is highThe cave structure is stableUnderground chambersDesign optimisation/simulationInternal pressurePrincipal stress
The application discloses a high internal pressure chamber axis determination method, and takes the direction of the minimum horizontal principal stress in the ground stress as a reference standard, and determines the direction of the longitudinal axis of the high internal pressure chamber as a direction which is not more than 25 degrees with the direction of the minimum horizontal principal stress and is maximally close to the strike of the main structure surface of the rock mass, according to the direction of the longitudinal axis of the high internal pressure chamber, the direction of the long axis on the cross section of the high internal pressure chamber should be consistent with the direction of the minimum ground stress. The application provides an effective method for determining the axis of the high internal pressure chamber such as compressed air energy storage, the method can maximize the surrounding rock pressure on the cross section of the chamber, fully utilizes the surrounding rock pressure in the stratum to balance the air pressure in the gas storage chamber, and is more favorable for the stability of the chamber structure; the method can reduce the opening degree of the structure surface in the surrounding rock as much as possible, and is more favorable for the sealing of the high internal pressure gas storage chamber.
Owner:SHENGNENG ENERGY (ZHEJIANG) CO LTD