108 results about "Bedrock" patented technology

The invention relates to the technical field of underground space development, and provides a coastal bedrock type city underground space development geological suitability evaluation method comprising the following steps: analyzing key geological problems of land area and sea area underground space development, and extracting related geological factors; basic geological data are collected and classified, a geological suitability evaluation index system is constructed, and geological evaluation units are divided; subjective and objective weights are determined based on an analytic hierarchy process and an entropy weight method, and an optimal comprehensive weight is obtained through game theory combination weighting; modeling based on a grey correlation analysis method, and calculating and grading suitability scores of the evaluation units; and integrating evaluation results, and generating an underground space development geological suitability partition map of land-sea overall planning. According to the scheme, the underground space development pattern is optimized, comprehensive utilization of land and ocean resources is promoted, and safe, efficient and sustainable development and utilization of the coastal city underground space are powerfully supported.

The invention belongs to the technical field of geophysical exploration, and particularly relates to a method and a system for quantitatively measuring intrinsic parameters of bedrock fractures based on all-angle domain amplitude and phase joint inversion. The method comprises the following steps: acquiring geological radar reflection data of a target fracture at a plurality of incident angles; synchronously extracting data sequences of amplitude change along with angles and phase change along with angles; establishing a fracture reflection theoretical model; constructing a target function jointly constrained by the amplitude residual and the phase residual; and adopting a global optimization algorithm to minimize the target function, and synchronously inverting to obtain the fracture opening, the filler dielectric constant and the occurrence parameter. According to the invention, through the combined constraint of the amplitude and the phase, the inversion multiplicity is effectively inhibited; accurate system effect correction is adopted, so that the reliability of large-angle data is ensured; according to the method, multi-parameter synchronous inversion without prior hypothesis is realized, the inversion precision is small in relative error, the method is obviously superior to a traditional method, and the method has important engineering application value.

The invention provides a physical information long-short-term memory network site seismic response prediction method based on kinematics derivative constraint and data folding. The method comprises the following steps: collecting and preprocessing bedrock and ground surface seismic oscillation data; displacement, speed and acceleration supervision labels are constructed through surface acceleration integration; constructing a long-short-term memory network containing a data folding and unfolding module; physical constraint loss is constructed by utilizing kinematics derivative relations between displacement and speed and between speed and acceleration, and a network is trained by combining an adaptive weight strategy; and outputting earth surface displacement, speed and acceleration time history by adopting the trained network. According to the method, under the condition that constitutive parameters of a soil layer are not explicitly given, physical consistency constraint can be applied to the field seismic response prediction process, the long-time program train training burden is reduced through sequence folding processing, and the method is suitable for field seismic response prediction.

The invention discloses a slope dangerous rock mass stability evaluation method and system based on kinetic parameters, and relates to the technical field of geological disaster risk evaluation, and the method comprises the steps: determining an instability mode based on the development characteristics and development environment of a to-be-evaluated slope dangerous rock mass; dangerous rock mass vibration characteristics and bed rock vibration characteristics of the slope dangerous rock mass to be evaluated are collected respectively; calculating dynamic characteristics of the slope dangerous rock mass to be evaluated based on the dangerous rock mass vibration characteristics and the bed rock vibration characteristics; based on a preset stability scoring table corresponding to the instability mode, scoring the development characteristics and the dynamic characteristics to obtain a scoring result; and carrying out stability evaluation on the to-be-evaluated slope dangerous rock mass based on the scoring result. According to the invention, the technical problems of insufficient evaluation result adaptability and low precision in the prior art are solved.

The embodiment of the utility model relates to the field of rock-soil settlement monitoring, in particular to a multi-stratum integrated layered settlement monitor. The multi-stratum integrated layered settlement monitor comprises a settlement pipe and a settlement magnetic ring, the settlement magnetic ring comprises an outer magnetic ring and an inner magnetic ring arranged on the outer side of the settlement pipe in a sleeving mode, and a supporting rod is arranged at the bottom of the inner magnetic ring and used for containing the outer magnetic ring; a plurality of transmission grooves parallel to the tangential direction of a certain ring body are formed in the outer magnetic ring, and one end of each transmission groove penetrates through the outer magnetic ring; a fixing needle is arranged in each transmission groove, and one end of each fixing needle is sleeved with a first spring used for ejecting the corresponding fixing needle out of the corresponding transmission groove. According to the embodiment, the defect that an existing layered settlement monitor cannot be used for monitoring deep hard rocks is overcome, and compared with a traditional bed rock mark and a layered mark, the drilling cost is greatly saved, stability and compatibility are improved, and the application range of strata is widened.

The present application relates to geotechnical engineering and geological disaster prevention technical field, specifically disclose a kind of combined bedrock reconstruction and slope modification multi-cladding layer slope and its construction method, the present application is strengthened by constructing cemented rock-embedded groove the binding force of slope and bedrock, form anti-sliding "structure pile" effect, control bedrock seepage passage, significantly improve the overall collaborative stability of slope-bedrock;In the process of layered filling, embedded cemented soil and rock interlayer body, constitute continuous, multi-level interlayer structure, enhance the integrity of structure, overcome the problem of localization of traditional supporting structure;By being arranged between cemented soil and rock interlayer body and conventional soil and rock mixture embedded cemented layer gravel drainage groove, realize multi-channel grading drainage and anti-seepage function in slope, effectively reduce pore pressure;Through conventional drainage facilities and the drainage structure inside slope cooperation, form "upper cut, surface guide, lower discharge, buffer" four-in-one composite drainage system, improve the anti-sliding performance and seepage control ability of slope.

The present application provides a kind of geologic stratum lithology regional prediction method, system, terminal equipment and storage medium, it is related to computer system field.The system includes data management module, sample management module, model training module, model management module, lithology prediction module and the like.The present application utilizes geophysical, geochemical, remote sensing and other multi-source data, based on deep learning image segmentation algorithm, forms regional shallow surface stratum lithology identification model, carries out high-precision rapid stratum lithology prediction and regional segmentation to the bedrock exposed area and shallow cover area with lower exploration degree, supports geological mapping and mineral exploration work.

The invention relates to a buried hill gas storage effective gas storage space evaluation method, and belongs to the technical field of oil-gas exploration. The method comprises the following specific steps: acquiring fracture development parameters; determining the type of a storage space; reservoir logging response characteristics are determined; extracting buried hill cracks; establishing a bedrock geologic model and a bedrock buried hill discrete fracture model of the target area; and importing the results into a gas storage simulation model in the form of data flow, extracting effective gas storage spaces of a substrate and a crack of the buried hill gas storage, and determining a final buried hill building effective gas storage space. Through research on the method for calculating the reservoir space of the buried hill oil and gas reservoir rebuilt gas storage, the problem of invalid reservoir space calculation is deducted, the calculation accuracy is improved, and theoretical support is provided for calculation of the buried hill reservoir building capacity and later injection and production well position deployment.

The invention belongs to the technical field of anti-seepage curtains of red-bed landfills, and discloses an optimal design method for a vertical anti-seepage curtain of an irregular landfill in a red-bed region, which adopts a drilling, geological radar and X-ray diffraction combined technology in the exploration and data acquisition stage to clearly distinguish hydrophilic expansive mudstone and high-permeability sandstone, and the optimal design method for the vertical anti-seepage curtain of the irregular landfill in the red-bed region is provided for the vertical anti-seepage curtain of the irregular landfill in the red-bed region. A space coupling model of the pile body and the red rock stratum is established by means of three-dimensional laser scanning, and the lithologic boundary of the dual seepage system is defined; in the model construction stage, parameter distribution is analyzed through a Markov random field model, regular updating is conducted in combination with a Kalman filtering algorithm, and dynamic changes such as sandstone fracture expansion caused by pile settlement can be adapted; a modified bentonite and nanoscale montmorillonite composite material is used in a sandstone area, construction is conducted through a high-pressure jet grouting technology, the permeability coefficient is set to be that the insertion depth extends to the complete bed rock by 2-2.5 m, and the problem of local leakage caused by the fact that the seepage-proofing design is not matched with the actual conditions of a red layer is solved.

The invention belongs to the technical field of geological research, and provides a helium source rock prediction method and device, a storage medium and equipment, and the method comprises the steps: taking a bed rock top surface seismic horizon explained and tracked by a target area as a bed rock top surface, and taking a preset time window below the bed rock top surface as a target object; making a bedrock seismic waveform classification attribute graph of a preset time window; according to the bedrock seismic waveform classification attribute graph and the seismic reflection characteristics of the various different types of rocks of the bedrock, determining the corresponding relation between the different types of rocks of the bedrock and different seismic waveform distribution areas displayed by the bedrock seismic waveform classification attribute graph; and predicting helium source rocks of different types based on the corresponding relationship and different seismic waveform distribution areas displayed by the bedrock seismic waveform classification attribute graph to obtain a prediction result. Through the prediction method, on the premise of not depending on gravity and magnetic data, the prediction accuracy of the helium source rock can be greatly improved.

The application discloses a kind of fluid identification method and system of water-saturated hydrogen index contrast method, calculate reservoir matrix porosity;Electric imaging and double lateral data are combined to calculate rock fracture porosity, and sum matrix porosity to total porosity;Assume that bedrock reservoir pore is water-saturated, select the dynamic skeleton neutron value of the dense layer section of lowest porosity, high resistivity dynamic skeleton as fixed skeleton value, calculate the dynamic skeleton neutron value of the purpose layer in combination with total porosity;According to dynamic skeleton neutron value, calculate water-saturated hydrogen index of research interval;Water-saturated hydrogen index is compared with neutron actual logging value to calculate neutron difference value;In combination with gas production test data, the relationship between acoustic time difference and neutron difference value and the change relationship between matrix porosity and neutron difference value are analyzed using neutron difference value, and the relationship chart of quantitative identification gas-water layer is obtained.The method eliminates the influence of anisotropy, fracture occurrence and the like of bedrock lithology, highlights the characteristics of reservoir gas layer, and can more accurately identify the properties of reservoir fluid.

The application provides an inversion method for describing the connectivity of the internal reservoir of a faulted karst body. The method uses seismic attributes reflecting the outline of the faulted karst body, the holes and cracks in the faulted karst body, establishes a comprehensive low-frequency model reflecting the carbonate bedrock, the faulted karst body, and the crack and hole system in the faulted karst body, uses the model to perform post-stack constrained sparse pulse inversion, obtains a longitudinal wave impedance data body of the underground, and uses the longitudinal wave impedance data to give a longitudinal wave impedance threshold value of the reservoir, and describe the connectivity of the internal reservoir of the faulted karst body in space.

The invention discloses a soil nonlinear site seismic shear stress determination method, which comprises the following steps of: firstly, constructing a site stratified soil simplified model, and fitting a soil dynamic curve; then, the equal-amplitude cyclic stress of the seismic oscillation waves is vertically incident from the bottom of the site bedrock; constructing a transfer matrix to obtain an amplitude matrix of each soil layer, solving to obtain seismic shear stress of each soil layer, calculating normalized dynamic shear strain of each soil layer by using a time-domain dynamic shear strain component, substituting the normalized dynamic shear strain into a soil dynamic curve, determining new dynamic shear modulus and damping ratio of each soil layer, and calculating the seismic shear stress of each soil layer. Iteration calculation of the new dynamic shear modulus and the damping ratio is repeated, the dynamic shear modulus and the damping ratio output after iteration are called as the equivalent shear modulus and the equivalent damping ratio, and the seismic shear stress of each soil layer of a non-linear field of a soil body is solved when seismic waves are vertically incident, so that a foundation is provided for earth and rockfill dam seismic response research; and reference is provided for site selection of a proposed project, design of a site anti-liquefaction scheme and the like.

The application discloses a dangerous rock mass structure surface dynamic damage identification method based on resistance distribution states, relates to the technical field of dangerous rock mass collapse monitoring and early warning of rock-soil slopes, and comprises the following steps: arranging electrode arrays on the two sides of the junction of a test dangerous rock mass and a stable bedrock; the electrode arrays comprise a group of power supply electrodes and multiple measuring electrodes; simulating the structure surface damage expansion process of the test dangerous rock mass based on a ladder type damage loading mode, and obtaining a dangerous rock mass crack damage factor in the structure surface damage expansion process; obtaining resistivity data corresponding to the structure surface damage expansion process based on the electrode arrays; constructing a damage-resistivity correlation model based on the dangerous rock mass crack damage factor and the resistivity data; and identifying the damage of the structure surface of a dangerous rock mass to be identified based on the damage-resistivity correlation model. The application alleviates the technical problem that hidden structure surface damage cannot be accurately captured in the prior art.

The present application relates to a kind of determination methods of underwater foundation pit disaggregation energy control blasting cushion height, the present application sets up n+1 buffer pad to be preferred height in the preferred range of the optimum height δ of buffer pad, using ansys finite element software, establish blasthole, bedrock, explosive, block, the finite element model of n+1 buffer pad to be preferred height, get the damage depth of bedrock under the action of blasting, then the damage depth of bedrock after using different buffer pad height is compared, the to-be-optimized height δ that satisfies the following conditions i It is the best selected thickness of buffer pad: the damage depth h of bedrock under the action of blasting i Gradually tend to be stable and the height of buffer layer is minimum at this time.The present application can meet the actual engineering problem, protect the excavation of bedrock at the same time, meet the blasting construction specification, avoid secondary construction, speed up construction efficiency and realize efficiency maximization.

The invention relates to the technical field of oil and gas resource exploration, in particular to a fracturing design method based on bedrock three-dimensional geological modeling, which comprises the following steps: S1, carrying out geological survey on an application area, and collecting geological characteristics and data; s2, constructing a three-dimensional geologic model of the bedrock reservoir by using the collected data; s3, optimizing a fracturing segment cluster by integrating the geological dessert and the engineering dessert; s4, constructing a crack model, and predicting an expansion path and a form of a crack in a fracturing process; and S5, selecting a propping agent according to the geological features, the geological data, the three-dimensional geological model of the bedrock reservoir and the fracture model, and predicting the temperature of the reservoir. According to the fracturing design method based on bedrock three-dimensional geological modeling, the geological characteristics and structure of an underground reservoir are accurately described through the three-dimensional geological modeling technology, a reliable geological model is provided for fracturing design, fracturing segment clusters and well position selection are optimized, the mining efficiency is improved, and the development cost is reduced.

To provide a rock bolting method which enables long-term stabilization without making any major changes to a conventional process when stabilizing the bedrock around a tunnel installed deep underground with rock bolts and can simultaneously improve a problem of spring water caused by a construction of rock bolts.SOLUTION: A method for manufacturing a stabilized tunnel rock structure includes a step (S110) of forming a hole from a surface of a tunnel located deep underground, a step (S120) of inserting a rock bolt into the hole, an injection step (S130) of injecting a mixture of a hardener and a concretion agent into the hole, and a fixation step (S140) of hardening the hardener and fixing a loosened area of the rock around the tunnel to the rock layer in a deep portion of the tunnel surrounding rock via the rock bolt, thereby stabilizing the rock around the tunnel.SELECTED DRAWING: Figure 1

The invention discloses a method for quantitatively representing the supply proportion of a material-source intersection area based on element enrichment factor tracing. The method comprises the following steps: S1, establishing a bedrock mother rock element enrichment factor standard chart; s2, acquiring element enrichment factors of the sedimentary area; s3, principal component difference analysis; and S4, calculating the supply proportion of different material sources through linear regression. According to the method for quantitative characterization of the supply proportion of the material source intersection area based on element enrichment factor tracing, an element enrichment factor method is introduced into deep stratum material source research; by optimizing reference element selection, establishing a targeted mother rock standard chart and combining principal component analysis and linear regression, accurate tracing of deep stratum material sources and quantitative calculation of the intersection proportion are achieved, the blank of a deep stratum element enrichment factor material source tracing technology is filled, and the tracing method has a wide application prospect. And a key technical support is provided for deep reservoir prediction and oil-gas exploration of the petroliferous basin.

The invention discloses a hard rock ditching operation robot for submarine pipe cable laying. The hard rock ditching operation robot comprises a self-adaptive rock breaking control milling, drilling and crushing mechanism and a combined water jet spraying mechanism, and the self-adaptive rock breaking control milling, drilling and crushing mechanism comprises a multispectral submarine sediment scanner, a shaft punching part and a self-propelled drill bit connected with the shaft punching part; the shaft punching part is used for applying impact perpendicular to a milling surface to the self-propelled drill bit; the multispectral seabed sediment scanner is used for scanning the sediment at the ditching position to determine the type of the sediment and adjusting the rotating speed and the impact frequency of the self-propelled drill bit according to the type of the sediment. The problem that the hard rock substrate seabed is broken and ditching is difficult is solved, the pipe cable is buried in the groove through hard rock ditching, the problem that the pipe cable is prone to damage due to the fact that the pipe cable is suspended on the surface of bed rock is avoided, and meanwhile the problem that cost is increased due to the fact that the pipe cable bypasses is also avoided.

The invention provides a method and a device for designing a raft foundation of a high-rise building on a soil-rock combined foundation. The method comprises the following steps of: transmitting an acting force to a raft based on the arrangement position of a vertical component; based on the acting force and geological survey data, whether the bearing capacity of the soil layer and the bed rock meets the design requirement of adopting a raft foundation or not is judged, and if yes, preliminary design parameters of a raft are determined; based on geological survey data, determining an estimated boundary between a soil layer and a bedrock at the elevation of the bottom plate; setting parameters of the mattress layer are determined based on the position of the pre-estimated boundary and the properties of the soil layer and the bedrock; and determining a foundation reaction and deformation checking calculation result of the high-rise building raft foundation based on the set parameters and the preliminary design parameters, and adjusting the set parameters and / or the preliminary design parameters when the foundation reaction and deformation checking calculation result does not meet requirements. By means of the compressibility of the mattress layer, deformation of the soil-rock combined foundation is coordinated, and differential settlement is effectively controlled.

The invention provides an accumulation body side slope seismic stability analysis method based on an improved Newmark method, and relates to the technical field of accumulation body side slope seismic stability analys.The method comprises the steps that if a potential sliding face of a bed rock overlying accumulation body is a linear face, the potential sliding face of the bed rock overlying accumulation body is processed in a conventional mode, and if the potential sliding face of the bed rock overlying accumulation body is a linear face, the potential sliding face of the bed rock overlying accumulation body is processed; if the sliding surface is a nonlinear surface, the sliding surface is equivalent to a linear sliding surface based on an energy principle; dividing the accumulation body into an unsaturated state and a saturated state; respectively calculating critical seismic coefficients corresponding to the accumulation body according to an unsaturated state and a saturated state; by adopting an acceleration time-history rectangular strip division method, carrying out segmented integration on the seismic acceleration time history exceeding the critical seismic coefficient to obtain permanent displacements of the sliding body corresponding to an unsaturated state and a saturated state respectively; analyzing the seismic stability of the accumulation body slope by combining the critical seismic coefficient and the permanent displacement; according to the invention, the earthquake stability of the accumulation body slope under the influence of rainfall before earthquake can be comprehensively and accurately reflected.

The application relates to a deep rock mass displacement monitoring method based on segmented temperature compensation and relates to the technical field of geotechnical engineering monitoring.The deep rock mass displacement meter (single-point or multi-point displacement meter) is arranged in a borehole, a hollow measuring rod is adopted, and a temperature sensor is arranged in the hollow measuring rod to realize real-time collection of multiple points of temperature along the length direction of the measuring rod; the measuring rod is divided into multiple monitoring sections, the temperature deformation of each section of the measuring rod is calculated according to the measured temperature of the corresponding depth of each section of the measuring rod, the displacement measurement value of each measuring point is compensated by the segmented temperature deformation, the true displacement of the bedrock is obtained after the temperature influence is eliminated, and thus the quantitative description of the bedrock creep process is realized.The application overcomes the system error caused by the uneven distribution of the ground temperature gradient, significantly improves the deep displacement monitoring precision, is compatible with the existing deep rock mass displacement meter structure, is easy to implement, and is suitable for the bedrock creep mechanism research and long-term safety monitoring of major projects.

The utility model discloses a device for improving geophysical prospecting electrical method grounding conditions in a shallow bed rock area, which is provided with an electrode base body, the electrode base body is of a long-strip-column-shaped structure, one end of the electrode base body is provided with a conical column head, the electrode base body is internally provided with a liquid storage soft bag, a puncture needle is arranged above the liquid storage soft bag, and the electrode base body is provided with an electrode core. The puncture needle is installed on the rotating seat, an overflow channel is arranged in the rotating seat, and a hammering cap is detachably installed on the rotating seat. By arranging the liquid storage soft bag, the puncture needle, the overflow channel and the like, the resistance reducing liquid is pre-stored in the device, and a resistance reducing agent does not need to be manually and repeatedly applied on site, so that the operation process is simplified, and the working efficiency is improved. Under the complex terrain condition of a shallow bedrock area, the grounding resistance can be rapidly improved, and the problems that a traditional method is tedious in operation and inconvenient to carry are effectively solved.

The invention discloses a high-level radioactive waste deep geological disposal and heat energy recovery collaborative method, which belongs to the field of high-level radioactive waste geological disposal, and comprises the following steps: S1, tunneling a disposal roadway in a complete bedrock of a disposal repository, excavating a disposal hole in a bottom plate of the disposal roadway, and tunneling the disposal roadway in a relatively complete crystal bedrock; s2, a heat insulation film is laid around the hole wall and the bottom of the treatment hole, and the thickness of the heat insulation film is 0.5 cm; s3, constructing a water injection station, a heat exchange pipe and a centralized heat exchange station; s4, filling a gap between the heat exchange pipe and the treatment tank with a bentonite buffer material; and S5, high-level radioactive waste is treated. The heat energy recovery pipe surrounding the high-level radioactive waste disposal hole is constructed on the basis of a traditional crystallized rock vertical hole high-level radioactive waste disposal method, the heat energy recovery pipe can effectively absorb decay heat of the high-level radioactive waste, the situation that the temperature of bed rock of crystallized rock rises and thermal stress is generated is avoided, meanwhile, decay heat recovery of the high-level radioactive waste is achieved, energy is fully utilized, and the energy utilization rate is increased. The carbon neutralization target is met, and wide application and popularization prospects are achieved.

This invention belongs to the field of soil and rock mass pollution remediation technology, and discloses a remediation system and method for hexavalent chromium contaminated soil / fractured rock mass, including a heating unit, a temperature monitoring unit, and a ground barrier unit. The heating unit includes an energy supply system and a heating well, with the energy supply system and the heating well sealed together, using heat conduction heating to heat the soil and fractured rock mass in situ. The temperature monitoring unit includes temperature sensors and monitoring wells, with the temperature sensors spaced along the depth direction of the monitoring wells. The temperature monitoring unit enables real-time temperature monitoring and feeds the data back to the energy supply system. The ground barrier unit is a concrete layer that insulates and seals the surface of the remediation area, preventing heat loss and air ingress into the soil. This invention solves the technical problems of difficult mass transfer of reducing agents, unstable remediation effects, and high difficulty in remediating fractured bedrock in traditional in-situ remediation technologies for Cr(VI) pollution.

The application discloses a kind of shallow buried covering type karst leakage path detection method.It includes the following steps, S1: the karst distribution characteristics of region is interpreted by remote sensing, and the initial target area is determined in combination with hydrogeological survey;S2: the target area is detected by AMT on a large scale, and the low resistivity anomaly zone is identified;S3: based on AMT result, the abnormal band is scanned by encryption using GPR, and the bedrock surface and karst shape are drawn;S4: based on the upstream of the karst groundwater seepage path judged preliminarily by hydrogeological survey, throw tracer, and set receiving point downstream to dynamically monitor the tracer concentration in water sample to determine the connectivity between the injection point and the receiving point;S5: integrate remote sensing, geophysical prospecting and tracer data, construct three-dimensional groundwater flow-solute transport model, and output groundwater runoff network.The application has the advantages of improving detection accuracy, reducing cost and improving detection efficiency.

The invention discloses a water exploring and grouting method for a lower bedrock section in shaft construction. The water exploring and grouting method comprises the following steps that S1, a project summary and geological and hydrological conditions are obtained; s2, determining the necessity of advanced water detection and grouting; s3, working face advanced water detection, wherein according to the advanced water detection grouting depth of the water detection section, water detection holes are formed, and segmented advanced water detection is conducted; s4, grouting design and grouting construction are conducted, specifically, in the segmented grouting process, the grouting range is determined through grouting pad design, grouting hole arrangement, grouting pressure determination and grout preparation, and segmented grouting is conducted according to the segmented mode in the S3; and S5, grouting construction is conducted. The method can effectively detect and block rock stratum crack water, reduce water consumption and effectively guarantee safe and smooth operation of shaft digging and building construction.

The invention discloses a dangerous rock mass stability evaluation method and system based on an amplitude ratio and a frequency ratio, and relates to the technical field of geological disaster risk assessment, and the method comprises the steps: collecting dangerous rock three-way vibration data and bed rock three-way vibration data in the same time interval; the dangerous rock three-dimensional vibration data and the bedrock three-dimensional vibration data are synthesized into dangerous rock one-dimensional amplitude data and bedrock one-dimensional amplitude data respectively, and the ratio of the dangerous rock amplitude standard deviation to the bedrock amplitude standard deviation is calculated to obtain an amplitude ratio; calculating the ratio of the dangerous rock peak frequency to the bedrock peak frequency to obtain a frequency ratio; and inputting the amplitude ratio and the frequency ratio as inputs into a trained dangerous rock mass stability evaluation model, and identifying the stable state of the dangerous rock mass. According to the method, the problem that the accuracy of a stability evaluation result is insufficient due to excitation and equipment temperature drift in dangerous rock mass vibration monitoring in the prior art is solved.

The invention relates to a risk evaluation method for water inrush and sand inrush of a coal mine under a thin bedrock condition of a thick unconsolidated formation, and the risk evaluation method comprises the following steps: analyzing water inrush and sand inrush disaster pregnancy conditions, and on the basis of referring to the previous roof water inrush and sand inrush index selection experience, aiming at the geological conditions of the thin bedrock of the thick unconsolidated formation; and a four-dimensional water inrush and sand inrush risk evaluation system for unconsolidated formation characteristics, bedrock structures, mining conditions and structural properties is constructed. An entropy weight-principal component analysis combined weighting model is provided, index discrete features are quantified through an entropy weight method, index redundancy is eliminated in combination with principal component analysis, objectivity and scientificity of weight distribution are achieved, the weight significance of key indexes is improved, and therefore the water inrush and sand inrush risk identification precision is improved. And finally, on the basis of a vulnerability index and a natural discontinuity point classification method, the Wanfu mining area is divided into five-level risk areas, the division result preliminarily reveals the law of structure dominance and water-resisting layer disaster control, and the structure-hydrology-engineering coupling disaster-causing mechanism under the condition of thick unconsolidated strata and thin bedrock is clarified.