83 results about "Effective stress" patented technology

The invention relates to a concrete temperature-stress two-parameter cooperative monitoring and early warning method and system, and belongs to the technical field of concrete structure health monitoring, and the method comprises the steps: activating a composite sensor network disposed at a preset position of a concrete structure, and executing a sensor self-calibration mode; the method comprises the following steps: synchronously acquiring temperature and stress original monitoring data of each node, processing based on an altitude air pressure compensation algorithm, and outputting a temperature gradient field matrix and a stress tensor sequence with aligned time domains; the method comprises the following steps: separately calculating a thermal stress component and an effective stress component, performing integral calculation on hydration reactivity, generating a multi-dimensional feature vector set, inputting a pre-constructed prediction model, executing time sequence evolution prediction, calculating a crack probability value, performing environment correction in combination with real-time environment parameters, outputting a risk level identifier, and matching a preset regulation and control strategy. And generating an equipment control instruction set and executing corresponding regulation and control actions. According to the invention, the accuracy and timeliness of crack risk prediction can be improved.

The invention discloses a geotechnical engineering catastrophe dynamic real-time intelligent early warning method and system based on displacement monitoring, and the method comprises the steps: collecting the real-time displacement data and related parameters of a geotechnical engineering region through displacement monitoring equipment, and transmitting the real-time displacement data and related parameters to a bank slope stability evolution analysis platform to establish a multi-dimensional database; calling a fractured rock mass effective stress analysis model to calculate rock mass effective stress distribution characteristics, and inputting a multi-grid sliding surface stress calculation algorithm to obtain a potential sliding surface stress state and a critical threshold value; inputting the sliding surface stress parameters and the displacement data into a multi-field coupling analysis learning prediction model to obtain a displacement evolution trend and a catastrophe risk coefficient; and finally, real-time early warning information is generated and fed back through the catastrophe dynamic real-time intelligent early warning module. The method improves the real-time performance and accuracy of early warning, can effectively guarantee the safety of geotechnical engineering, and is suitable for catastrophe early warning scenes of geotechnical engineering such as bank slopes and foundation pits.

The invention discloses an invasion limit surrounding rock excavation method for a large deformation section of soft rock, and relates to the technical field of invasion limit surrounding rock excavation construction for the large deformation section of the soft rock. The invasion limit surrounding rock excavation method for the large deformation section of the soft rock comprises the steps that refined partitioning of an invasion limit body is achieved through dense scanning and loose circle testing; dividing the invasion limiting body into a core pressure-bearing area and a peripheral stress relaxation area; a main stress diversion arch crossing an invasion limit section is constructed through full-ring radial grouting reinforcement and erection of a strong profile steel temporary cover arch, and effective stress transfer is achieved; the mode of subarea gradual type dismantling and chiseling and instant supporting is adopted, a peripheral stress relaxation area is treated firstly, then a core pressure-bearing area is treated, and surrounding rock disturbance is reduced; the circumferential stress equalization is realized by compensating grouting in stages and dynamically adjusting the grouting pressure according to real-time monitoring data. According to the method, the excavation construction safety of the invasion limit surrounding rock of the large deformation section of the soft rock can be improved, surrounding rock disturbance is reduced, stress distribution is optimized, and the treatment efficiency of the invasion limit surrounding rock is improved.

The invention provides a visual characterization method, device and equipment for a deformation rule of a rock microstructure, and relates to the technical field of oil-gas exploration. The method comprises the following steps: acquiring scanning grey-scale map data of an internal structure of a rock under different load conditions; establishing a rock three-dimensional digital core model under different load conditions according to the scanned grey-scale map data and the pre-trained neural network; performing pore structure feature extraction processing according to the rock three-dimensional digital core model to obtain rock pore structure feature parameters, and representing a dynamic deformation rule of the rock micro-pore structure along with effective stress loading according to the rock pore structure feature parameters; performing fracture morphological feature extraction processing according to the rock three-dimensional digital core model to obtain a rock fracture morphological feature parameter system, and representing a rock internal fracture morphological deformation evolution rule according to the rock fracture morphological feature parameter system. According to the method provided by the invention, the real rock micro-pore structure is accurately reflected.

The invention discloses a method for determining the minimum cylindrical shell thickness of a core-filled concrete column, and relates to the technical field of constructions.The method for determining the minimum cylindrical shell thickness comprises the steps that the first cylindrical shell thickness meeting the design bearing capacity condition of the core-filled concrete column is calculated; calculating the thickness of a second cylindrical shell meeting the requirements of the construction pouring stage; calculating a third cylindrical shell thickness meeting the construction requirement that the stirrups and the longitudinal bars are pre-embedded in the cylindrical shell; and selecting the maximum value of the first cylindrical shell thickness, the second cylindrical shell thickness and the third cylindrical shell thickness, and determining the maximum value as the minimum cylindrical shell thickness. According to the method, the minimum column shell thickness value of the core-filled concrete column under different column heights and different design bearing capacities can be quantitatively determined in the design process through an effective acting stress model, a thick-wall cylinder theory and other theoretical models, the core-filled concrete column designed according to the minimum column shell thickness meets the requirements of engineering design, column shell materials can be saved, and the cost is reduced. And the utilization rate of the column shell UHPC material in the core-filled concrete column is improved.

The invention relates to the technical field of geotechnical engineering, in particular to a sandy soil liquefaction discrimination method which comprises the following steps: collecting geological survey data, seismic parameters and soil test and in-situ test results of a target area, and determining parameters required by numerical simulation; a three-dimensional calculation model is constructed, grids are subdivided, a constitutive model is set, static balance and an initial pore pressure field are established, and the accuracy of the model is verified through mechanical balance and fluid balance; dynamic waves are processed and applied, a free field boundary, a seepage mode and mechanical damping are set, a coupling constitutive model is constructed, and monitoring points are arranged on the liquefiable stratum; determining liquefaction according to the effective stress, the pore water pressure time history curve and the excess pore pressure ratio; according to the invention, vertical and lateral deformation after liquefaction can be predicted, quantitative deformation data can be provided, errors of a standard penetration test are reduced, and the problems of small application range and strong regionality are solved; and the judgment result is more accurate through the verification of the excess pore pressure ratio, and a reliable basis is provided for the design of engineering anti-liquefaction measures.

The invention discloses a shield tunnel electromechanical numerical control and testing integrated model test platform and method, and relates to the technical field of shield construction testing. Comprising the following steps: S1, collecting water-soil machine three-dimensional coupling test data in real time, and performing data preprocessing; s2, reconstructing a pore pressure, water content, stress and average effective stress multi-distribution field; multiple types of residual parameters are calculated, the three-dimensional water-soil coupling balance is evaluated, the hydraulic stress state is judged, and balance control over flow and pressure is executed; s3, when the hydraulic stress state is imbalanced, evaluating and correcting the flux adjusting quantity, and realizing water inlet and outlet flow adjustment; and S4, based on the three-dimensional water-soil coupling balance change rate and the correction flux regulation variable change rate, evaluating dynamic response consistency, updating parameters and correcting a threshold value. The problem that the test precision and the subsequent construction safety are affected due to the fact that an existing shield test device cannot accurately reflect the stress seepage collaborative change rule in the shield construction process under the complex water-rich stratum is solved.

According to the method for testing the effective prestress of the existing concrete structure considering the reverse friction influence, a plurality of prestressed tendons are pre-buried in concrete to form an in-service prestressed concrete member, and one prestressed tendon at the end part of the concrete is stretched by using a supplementary tensioning tool; in the stretching process, the obtained stretching stress of the prestressed tendon, the corresponding stretching length measured from the failure of friction constraint between an anchorage device and a wedge-shaped clamping piece of the prestressed tendon and the effective stress of the in-service prestressed concrete member are recorded for at least five times, and the obtained stretching stress and the corresponding stretching length are the secondary reverse friction force influence stress; selecting the friction coefficient of local deviation of the length per meter in the pore channel and the friction coefficient between the prestressed tendon and the wall of the pore channel from the anti-friction influence length corresponding to the anti-friction influence stress; finding out an optimal one; and calculating the effective stress of the out-service prestressed concrete member by using any recorded tensile length.

This invention provides a method and system for calculating pile foundation length, relating to the field of pile foundation design technology. Specific steps include: calculating environmental characteristic parameters based on the maximum flow velocity and highest water level under a preset return period using the moment estimation method to accurately quantify extreme hydrological evolution trends; constructing a formula for calculating the maximum scour depth by combining water-blocking characteristic parameters to obtain the scour reference surface, thereby overcoming the defects of physical boundary failure; reconstructing the effective stress field of the underlying soil layer based on the scour reference surface and stress release logic to realistically restore the physical unloading effect; calculating the side friction resistance at each depth using nonlinear strength decay logic to accurately assess the degradation loss of pile-soil bearing capacity; and outputting the optimal pile foundation length using a dynamic step-size iterative algorithm under a preset load safety threshold, based on the preset ultimate end resistance of the pile end bearing layer, ensuring the bottom line of flood control mechanical safety while avoiding over-design of the structure.

The invention relates to a saturated sand dynamic constitutive model construction method considering pore pressure fluctuation growth, which comprises the following steps: determining total pore water pressure including residual pore pressure component and transient pore pressure component, and constructing a normalized stress ratio skeleton curve independent of a pore pressure state; correcting the total pore water pressure to obtain corrected pore water pressure, and updating the average effective stress at the current moment by using the corrected pore water pressure; coupling the normalized stress ratio skeleton curve and the updated average effective stress to obtain a maximum shear stress value; the maximum shear stress value is used as a target state point, a dynamic virtual hysteretic curve is constructed, the stress-strain behavior of saturated sandy soil is described, accumulated damage and alternate shear shrinkage-shear expansion effects of a soil body in the cyclic loading process can be effectively considered, a pore pressure development curve and cyclic shear stress-strain response which better conform to the test rule are captured, and the test accuracy is improved. And a valuable tool is provided for evaluating the response and liquefaction strength of the saturated sand under the undrained cyclic loading condition.

The application discloses a kind of non-saturated solidified soil fatigue cracking damage prediction methods based on energy-mechanics method.The application introduces the effective stress formula proposed by Lytton and gives the solution method of relevant parameters in combination with energy-mechanics method, obtains the damage density evolution trend of non-saturated solidified soil material, finally based on the theory of fracture mechanics and continuous damage mechanics, on the basis of Paris equation, introduce damage density function, and based on dissipation strain energy DSE, the expression form of J integral is obtained, so as to establish the damage evolution prediction model capable of characterizing the multi-crack cracking process.The application solves the problem that the previous solidified soil fatigue cracking model cannot effectively reflect the influence of unsaturated characteristics on soil material cracking, and the model is based on the basis of mechanics theory, can better predict the multi-crack fatigue cracking damage evolution process from the mechanism level of non-saturated solidified soil material fatigue cracking, and provides basis and guidance for the design of solidified soil material and solidified soil road structure.

The application discloses a method for calculating the inner friction coefficient of a three-dimensional natural fracture wall surface in space, which comprises the following steps: determining the strike of the natural fracture and the included angle between the natural fracture and the horizontal plane; determining the horizontal maximum principal stress direction; determining the in-situ three-directional principal stress; determining the poroelastic constant and the formation fluid pressure; determining the natural fracture approaching angle; determining the unit normal vector of the three-dimensional natural fracture surface; determining the normal stress and the shear stress of the three-dimensional natural fracture surface; determining the effective stress; and determining the inner friction coefficient of the spatial natural fracture. The application considers that the natural fracture in the underground reservoir is spatially distributed, and is kept in static mechanical balance under the joint action of the in-situ stress field and the formation fluid. The application obtains the calculation method of the inner friction angle of the three-dimensional natural fracture in space in the rock mass containing the natural fracture medium by using a mathematical method, fills the blank of the method for obtaining the inner friction coefficient of the three-dimensional natural fracture in space, and can show the influence of the strike and the dip angle of the natural fracture on the inner friction coefficient of the fracture surface.

The application provides a method and device for evaluating the safety of liquefiable foundation of offshore wind turbine with single pile foundation, which can be applied to the technical field of offshore wind turbine single pile foundation. The method comprises the following steps: based on the load combination of the single pile foundation in the target working condition of the offshore wind turbine structure, the dynamic response of the offshore wind turbine structure is simulated by using a numerical model to obtain the excess pore water pressure ratio and effective stress of the foundation soil embedded by the single pile foundation; in the case that the excess pore water pressure ratio represents the deterioration of the foundation soil, the soil parameters of the deteriorated foundation soil are determined according to the excess pore water pressure ratio and the effective stress; the soil parameters are updated to the soil elements of the numerical model to perform static elastoplastic analysis on the single pile foundation, and the ultimate bearing capacity of the single pile foundation in the deteriorated foundation soil is obtained; the safety factor between the mud surface load of the single pile foundation under the load combination and the ultimate bearing capacity is calculated to evaluate the bearing safety of the single pile foundation in the deteriorated foundation soil.

The application discloses an arch dam valley amplitude deformation risk quantitative early warning method and system based on plastic effective stress evolution, and the method comprises the following steps: S1, acquiring deep site monitoring data; S2, calibrating the plastic effective stress coefficient and the rock mass or structural plane strength parameter, and determining the value range of different rock masses; S3, removing the elastic volume deformation component, and directly constructing the plastic effective stress tensor for controlling the shear yield; S4, constructing the dimensionless plastic approximation degree index K, and quantifying the approximation degree of the stress state to the failure envelope surface; S5, introducing the displacement rate and the cumulative deformation for double control verification, and intelligently identifying the critical yield locking, limited plastic damage and continuous structural plane rheological mode. The application solves the mechanism paradox between the traditional theory of 'water thrust causes deformation widening' and the actual monitoring of 'valley amplitude narrowing', and realizes the accurate quantification and grading early warning of the rheological risk of the deep rock mass of the high arch dam.

A method, system, device, and readable storage medium for predicting leading-edge bulging cracks are disclosed, relating to the field of geological disaster monitoring and early warning. Specifically, the method includes determining the active thrust of the landslide on the leading edge based on the landslide mass weight, sliding surface dip angle, seepage hydrodynamics, and additional thrust, wherein the additional thrust is generated by external dynamic disturbance. When the detected active thrust is not less than the passive earth pressure limit, the target vertical bulging displacement is determined based on horizontal shear displacement, maximum dilatation angle, geometric correction factor for shear zone thickness, hydraulic correction factor, initial effective stress, real-time effective stress, and dilatation angle stress sensitivity factor. The predicted leading-edge bulging crack result is determined based on the target vertical bulging displacement and the predicted vertical bulging displacement. This application can improve the accuracy and applicability of leading-edge bulging crack prediction.

The invention relates to the technical field of oil exploration, in particular to a method and device for measuring and analyzing the total porosity of deep coal rock. The method comprises the following steps: preparing a deep coal rock core sample of a target work area; measuring the deep coal rock core sample under different effective stresses to obtain the total porosity of the deep coal rock core sample; establishing a function equation of the total porosity and the effective stress based on the total porosity and the corresponding effective stress of the coal rock core sample measured under different effective stresses; and obtaining the total porosity of the deep coal rock of the target work area based on logging information of the target work area and the functional equation. The method mainly aims at a coal rock stratum, has higher precision compared with a previous method, and can provide necessary parameters for deep coal rock gas exploration dessert evaluation, reserve submission and the like.

The invention discloses a method and a device for evaluating lateral sealing performance of a shale gas reservoir in lifting stages. The method comprises the following steps: acquiring initial reference data of the shale gas reservoir and lifting response data of each lifting stage; dividing the target area into a plurality of geologic structure units and meshing the geologic structure units, and coupling multi-physical field coupling equations in each grid, including a stress equation, a physical property equation constructed based on initial reference data and lifting response data, and a gas seepage equation; iteratively solving a multi-physics field coupling equation, outputting grid effective stress and grid lifting amplitude after processing of a stress equation, outputting grid porosity and grid permeability after processing of a physical property equation, and outputting gas mass flux after processing of a gas seepage equation; and determining the maximum lateral sealing distance of each geological structure unit according to the gas mass flux and the grid permeability, then calculating a sealing coefficient, and evaluating the lateral sealing property of each geological structure unit of the shale gas reservoir in the lifting stage. According to the method, accurate and quantitative evaluation of the lateral sealing performance in the lifting stage can be realized.

This invention provides a quantitative calculation method for the multi-factor causes of abnormal low pressure in oil reservoirs, including: calculating the formation pressure P after uplift time t based on the formation temperature, pressure, overlying strata pressure, and effective stress coefficient before uplift; the formation temperature, formation pressure, overlying strata pressure, formation compaction coefficient, and effective stress coefficient at time t during the uplift process; the thermal expansion coefficient and compressibility coefficient of petroleum; and the petroleum residual coefficient after light hydrocarbon loss. Pt The calculation formula; based on the pressure value P Pt The calculation formula uses the controlled variable method to quantitatively calculate the influence of multiple controlling factors during the tectonic uplift period on the current abnormally low pressure P. Pt The relative contribution of the resulting erosion is determined by various controlling factors, including uplift erosion, temperature reduction, and dissolution. The method provided by this invention has wider applicability and greater practicality than previous methods, and possesses certain industrial application value.

This invention relates to the field of underground engineering and computational geotechnical mechanics numerical simulation technology, and discloses a method for simulating fluid-solid damage coupling in tunnels based on dynamic mapping of solid-structure units. The method first constructs a three-dimensional spatial discrete model, including three-dimensional solid units such as ordinary surrounding rock, consolidated grouting ring or loosened surrounding rock, and lining, as well as internal reinforced structural units, and sets stepped water pressure boundary conditions. It then constructs a non-common-node mapping dictionary based on dual constraints of spatial angle and distance. After performing fluid-solid alternation solutions, it extracts characteristic parameters to calculate the joint damage evolution of the consolidated grouting ring solid unit or the loosened surrounding rock solid unit and the lining solid unit. For the lining solid unit, it performs permeability characteristic reconstruction based on dual control of damage variables and crack opening; for the consolidated grouting ring solid unit or the loosened surrounding rock solid unit, it performs permeability coefficient updates based on effective stress and damage variables, achieving high-precision prediction of the joint disaster evolution of high-pressure water-filled tunnels.

The invention discloses a method and system for calculating the shale gas resource quantity in a complex tectonic region, and belongs to the field of shale gas.The method comprises the steps that S1, three-dimensional seismic data, logging data and core analysis data in the complex tectonic region are collected, and high-frequency denoising and wave impedance inversion are conducted; s2, generating a fracture distribution model by using a fracture structure quantitative description algorithm, and establishing a three-dimensional geologic structure model in combination with logging lithology recognition; s3, high-precision stratum thickness correction is carried out on the three-dimensional geological structure model, and effective stress distribution of the reservoir is calculated through stress field numerical inversion; s4, calculating effective porosity and permeability parameter distribution of the reservoir in combination with a porosity-permeability nonlinear coupling equation; s5, measuring to obtain pore structure parameters, and superposing to form a reservoir physical property comprehensive model; s6, performing super-resolution volume modeling on the model to generate a three-dimensional reserve model; and S7, calculating the unit resource quantity grid by grid based on the three-dimensional reserve model and adding the unit resource quantity. The method has the beneficial effect that the accuracy and stability of shale gas resource quantity calculation in the complex tectonic area are improved.

This invention discloses a method for predicting formation pore pressure in fractured reservoirs, relating to the fields of oil and gas exploration and development and geophysical logging technology. The method includes obtaining logging and geological parameters of the target formation; establishing a relationship between pore pressure and fracture aspect ratio based on the effective stress principle and fracture mechanics; calculating the theoretical P-wave velocity under different pore pressure conditions within a pressure range defined by hydrostatic pressure and normal stress on the fracture surface, using an equivalent medium model and the Gassmann equation; determining the pore pressure based on the residual between the theoretical and measured P-wave velocities; and comparing the calculated pore pressure value with the measured pressure value to establish an evaluation relationship. This invention has the advantages of reducing unnecessary and ineffective calculations, improving the stability and speed of the calculation process, and enhancing the physical rationality of the results.

The invention is applicable to the technical field of equipment calibration, and provides a calibration method and a calibration system for an effective stress box and a total soil pressure box, the method comprises the following steps: preparing a soil sample, and when the soil body relative compactness / consolidation degree under given consolidation pressure of the soil sample reaches target soil body relative compactness / target consolidation degree, determining the effective stress box and the total soil pressure box; a soil sample, an effective stress box to be calibrated and a total soil pressure box to be calibrated are placed in a calibration box according to a preset sequence; eliminating bubbles in the soil sample; sequentially performing sealing and vacuumizing saturation treatment on the calibration box; applying vertical stress and pore water pressure to the soil sample; and after the pore water pressure is stable, increasing the vertical stress step by step, and calibrating the effective stress box to be calibrated and the total soil pressure box to be calibrated according to the recorded pore water pressure under each level of vertical stress and the corresponding variable. According to the embodiment of the invention, the calibration accuracy of the effective stress box and the total soil pressure box can be effectively improved, and the reliability of a measurement result is improved.

The invention relates to an earthquake sand liquefaction prediction method, system and device based on deep learning and a medium. According to the method, historical site parameters are standardized, a deep neural network is constructed, and an initial pore pressure ratio predicted value is obtained through forward propagation; sequentially calculating physical constraint loss to ensure that the prediction does not violate the effective stress non-negative and pore pressure ratio upper limit principle, calculating monotonicity constraint loss to force the model to learn the correct trend that the liquefaction probability is not reduced when the seismic oscillation intensity is enhanced and the liquefaction probability is not increased when the soil anti-liquefaction index is enhanced, and calculating data fitting loss; and carrying out weighted fusion on the three types of loss to form a total loss function, and iteratively optimizing model parameters through back propagation to obtain a prediction model of the embedded soil mechanics principle. Therefore, while the precision of the prediction model is ensured, wrong prediction violating basic physical rules under extreme working conditions is avoided, and the reliability, generalization and engineering credibility of the model under unknown or complex scenes are improved.

The invention discloses a fractured shale oil seepage-stress field coupling simulation method based on virtual elements, and belongs to the technical field of oilfield development, and the method comprises the following steps: S1, constructing a solid deformation model of a fractured shale oil reservoir; s2, constructing a fluid seepage model of the fractured shale oil reservoir; s3, correlating the porosity change through volume strain, updating the permeability by using the cubic relationship between the porosity and the permeability, and establishing a seepage-stress field coupling model in combination with the solid deformation model and the fluid seepage model; and S4, solving the seepage-stress field coupling model by adopting a virtual element method, performing iterative calculation, and outputting a simulation result. According to the fractured shale oil seepage-stress field coupling simulation method based on the virtual element, the shale oil fluid-solid coupling model considering the multi-scale pore structure and the stress sensitive effect is established through the correction seepage equation and the effective stress principle, the simulation precision is high, and the productivity and reservoir dynamic prediction reliability is high.

The invention provides a horizontal well collapse pressure determination method and device, equipment and a storage medium, and the method comprises the steps: for each well section of a target horizontal well, determining horizontal principal stress corresponding to the well section based on the rock mechanics parameters of the well section and a preset horizontal principal stress formula, and determining the collapse pressure of the target horizontal well based on the horizontal principal stress corresponding to the well section; the method comprises the following steps: accumulating the liquid column pressure from 0 according to the cohesive force, the internal friction angle, the formation pore pressure and the effective stress coefficient which are obtained in advance, carrying out iterative processing on a capacity function until the value of the capacity function is equal to 0, and further determining the liquid column pressure corresponding to the capacity function being 0 as the collapse pressure corresponding to a well section. According to the method, the geostress model based on the micro-structure is used as a support, the influence of factors such as liquid column pressure and borehole wall percolation zone pore pressure change is considered at the same time, the collapse pressure is determined accurately and reliably, and technical support can be provided for borehole wall stability of the deep coal horizontal well, optimal design of drilling fluid density, reduction of underground complex accidents and improvement of drilling speed and efficiency.

The invention discloses a PHC tubular pile squeezing effect analysis method based on multi-source data fusion, and relates to the technical field of geotechnical engineering pile foundation construction analysis, and the method comprises the following steps: obtaining multi-source geological and monitoring data of a target site; constructing a multi-circle-layer spatial evolution model considering the structural damage of the soil body; after defining and assigning model parameters and boundary conditions based on multi-source data, operating the model to calculate and obtain excess pore water pressure distribution, radial effective stress increment distribution and a plastic zone development range of soil around the pile caused by a soil squeezing effect; performing time-space synchronization comparison verification on a model calculation result and sensor monitoring data; and according to the verification result, reversely adjusting the key parameters of the model to carry out iterative calculation until the matching degree reaches the standard, and outputting a calibrated soil compaction effect analysis result. According to the invention, through dynamic data fusion and model iteration calibration, high-fidelity dynamic simulation and accurate analysis of the soil compaction effect are realized.

The invention discloses a construction method and device for a damage constitutive model of coal rock and a storage medium, and belongs to the technical field of coal rock damage. The construction method comprises the following steps: acquiring a plurality of coal rock air pressure damage factors of a coal rock under a plurality of coal rock air pressures, a plurality of coal rock hydration damage factors under a plurality of drilling fluid soaking durations, and a coal rock load damage factor under the action of load stress; determining a plurality of coal rock total damage factors according to the coal rock air pressure damage factors, the coal rock hydration damage factors and the coal rock load damage factors; determining a coal rock maximum nominal stress-coal rock damage-coal rock maximum effective stress relationship according to the plurality of coal rock total damage factors and a pre-obtained coal rock maximum residual stress; according to the nominal stress-damage-effective stress relation and the preset strain-effective stress relation, the nominal stress-damage-strain relation is constructed to represent the damage constitutive model of the coal rock, and the damage constitutive model can improve the prediction accuracy of the damage degree of the coal rock.

The application discloses a kind of different effective stress state under fault zone seepage characteristic in-situ test device and method, comprising: water supply system, osmotic pressure control system, field in-situ sample, data measurement system and permeate collection system;The field in-situ sample is connected with water supply system, osmotic pressure control system, data measurement system, permeate collection system respectively;The application realizes the double regulation of sample pore water pressure, osmotic pressure by osmotic pressure control system, to obtain the coupling constitutive relation between the permeability coefficient-effective stress in fault zone, the critical hydraulic gradient and the failure hydraulic gradient under a certain effective stress state determined according to the specific circumstances of project.

The invention discloses a coal rock reservoir stress sensitivity quantitative evaluation device and method, and relates to the technical field of reservoir evaluation. The method comprises the following steps: preparing and assembling a rock core sample, performing a stress sensitivity test by using a calibrated coal rock reservoir stress sensitivity quantitative evaluation device, and applying confining pressure to the rock core sample by adopting a preset stress loading strategy until the rock core sample reaches a stable state; the method comprises the following steps: measuring confining pressure values of a rock core sample in real time by using a confining pressure sensor, determining latch points of the rock core sample under each confining pressure value, obtaining effective stress and permeability of the rock core sample at each latch point, constructing an effective stress and permeability relation curve, and quantitatively calculating stress sensitivity evaluation parameters of the rock core sample. And evaluating the stress sensitivity of the coal rock reservoir. By acquiring the structural response and permeability change of the coal rock under the multi-rate loading and unloading conditions, accurate evaluation of the stress sensitivity of the coal rock reservoir is realized, and a basis is provided for guiding exploration and development of the coal rock reservoir.