62 results about "Stress redistribution" patented technology

The invention relates to the technical field of anti-cracking performance testing, in particular to an ultra-high performance concrete anti-cracking performance testing system and a dynamic monitoring method thereof.The system comprises a dynamic stress field simulation feedback module used for sensing three-dimensional distribution of a micro stress field in concrete in real time by constructing a flexible loading array to obtain dynamic stress field data; the multi-scale damage evolution tracking module is used for deploying a high-resolution acoustic emission network and a distributed optical fiber sensing layer based on dynamic stress field data of the flexible loading array to form a full-scale evolution graph from microdefects to macroscopic cracks; and the intelligent healing efficiency evaluation module obtains stress redistribution data and a full-scale evolution graph, and a repairing medium containing a tracer agent is injected into a preset crack path. According to the method, the whole process of crack resistance of the material from defect initiation to repair and regeneration can be quantitatively evaluated; and finally, outputting a dynamic evolution rule of the crack resistance and enhancing potential evaluation.

The invention relates to the technical field of underground cavern construction, and discloses a layered rock mass cavern excavation parameter dynamic optimization decision system and method, and the system comprises a rock stratum database building module, an excavation simulation module and an excavation model optimization module. The method comprises the following steps: collecting basic data such as engineering geological conditions, rock mechanical properties and ground stress distribution; establishing an initial rock stratum parameter database through a three-dimensional ground stress test and rock mass permeability characteristic analysis; establishing a stratified rock mass excavation simulation model, simulating a failure mode of a stratified rock stratum under excavation disturbance, and analyzing stress redistribution and a potential failure area; determining a cavern axis direction, an excavation sequence and support parameters according to a simulation result; acquiring surrounding rock deformation, loosening circle expansion and seepage characteristic change; and utilizing a damage proximity index to predict the distribution of the loose circles, and optimizing the stratified rock mass excavation simulation model. The method can adapt to various complex working conditions from a sand shale interbed to an ultra-deep fractured stratum and the like.

The invention relates to the technical field of bridge engineering structure health monitoring, in particular to a service life prediction method and system for a bridge connection part, and the method comprises the steps: collecting the strain of a grouting sleeve, a reinforcement-grouting interface ultrasonic reflection signal and environment temperature and humidity data through a distributed sensor array; a three-dimensional dynamic void rate model is generated through fusion of a spatial topological mapping algorithm, a correlation function of load circulation and void expansion is established, the dynamic void rate is input into a bond strength coupling degradation model, after strength attenuation is quantized in combination with steel bar corrosion data and bond failure early warning is triggered, stress redistribution is calculated through multi-physics coupling simulation, and the dynamic void rate is obtained. Early warning is taken as a starting node, the actual load spectrum and temperature and humidity data are combined, Monte Carlo sampling is adopted to simulate rigidity degradation and output the residual life probability, the system comprises a multi-source collaborative sensing unit, a micro-void evolution analysis unit and a life prediction decision unit, and the safety control precision of bridge connection parts is improved.

The invention provides a tunnel surrounding rock deformation rolling time sequence prediction method and system considering excavation disturbance, and the method comprises the steps: obtaining a geometrical relationship from a tunnel face to a monitoring point, an excavation area and an excavation footage in a tunnel excavation process, and calculating a construction disturbance factor according to the obtained data; constructing and training a surrounding rock deformation prediction model, wherein the surrounding rock deformation prediction model is obtained by fusing a convolutional neural network, a bidirectional long-short term memory neural network and an attention mechanism layer; acquiring tunnel surrounding rock monitoring data, and preprocessing the monitoring data; and taking the preprocessed monitoring data and the calculated construction disturbance factor as input data of the trained surrounding rock deformation prediction model to obtain a final deformation prediction result. According to the method, the dynamic disturbance characteristics of stress redistribution in the tunnel excavation process are quantified into the construction disturbance factors, the nonlinear coupling relation between surrounding rock deformation and construction disturbance is analyzed through the hybrid model, and the tunnel surrounding rock deformation prediction accuracy is improved.

The invention belongs to the technical field of geotechnical engineering disaster prevention and reduction and earthquake engineering tests, and relates to a vibration table test method considering time-varying deterioration of anti-seismic performance of an anchored rock slope. The method comprises the following steps: firstly, constructing a dynamic performance time-varying deterioration model based on an anchoring system interface bonding force and a free section steel bar yield resistance attenuation rule; physical equivalent simulation of interface degradation and component yield resistance reduction is realized by regulating and controlling the proportion of rock mass similar materials and utilizing a graded rigidity anchoring system. The core of the method is that before a vibration table applies seismic waves, attenuation of the anchoring performance of a supporting structure is actively simulated in advance, so that a real evolution path that the bearing capacity of an anchoring system is reduced firstly, slope stress redistribution and accumulated damage are caused, and then sudden seismic loads are suffered is reproduced; the limitation that only the static low bearing capacity is simply simulated in a traditional test is broken through. According to the method, space-time coupling of static time-varying degradation accumulation and transient earthquake dynamic action is effectively achieved, the problems of interface degradation simulation distortion and the like are solved, and a reliable test method is provided for dynamic stability evaluation and reinforcement design of a long-term service anchoring slope.

The invention discloses a gradient combination anti-crack diaphragm wall concrete self-constraint stress optimization design method. The method comprises the following steps: firstly, constructing a BIM three-dimensional structure model comprising material performance, temperature gradient and stress state through three-dimensional laser scanning and core sample detection; then, carrying out stress partitioning based on the model, and calculating a self-constraint stress value and a stress transfer attenuation coefficient of each partition; then establishing an expanding agent proportion optimization model, simulating stress redistribution under different doping amount gradients by adopting a finite element algorithm, and screening a minimum effective doping amount meeting a stress homogenization index; and after the anti-cracking effect is verified through dynamic simulation, a final matching scheme is output. According to the method, the BIM technology and the material gradient design are combined, precise control over the concrete self-constraint stress of the underground diaphragm wall and active optimization of the crack resistance are achieved, the technical problem that traditional homogeneous material design is difficult to adapt to complex stress distribution is solved, and the durability and safety of the underground diaphragm wall structure are remarkably improved.

The invention discloses a reinforcing device and method for a side slope containing a weak intercalated layer, and belongs to the technical field of geotechnical engineering side slope reinforcement. The reinforcing device comprises a retaining wall and anchor cables, supplementary plates are arranged between units and are elastically connected, a water storage assembly is arranged on the side, close to the retaining wall, of the side slope, a water tank is arranged at the top of the retaining wall, and a water absorption assembly extending into the side slope is arranged on the retaining wall. The pushing assembly comprises a connecting cylinder, a connecting ring, an outer ring, a flexible pad and a corrugated pipe; the pump body at the water tank is connected with a hidden drainage header pipe and a water suction pipe through a three-way pipe; the retaining wall units, the pre-stressed anchor cables and the deep drainage system which are modularized are integrated, so that the cooperation of retaining, anchoring and drainage is achieved, and the defect that traditional measures are poor in collaboration is overcome. The water suction assembly is arranged, the pump body actively sucks water, the pore water pressure is efficiently reduced, and the problem that traditional gravity drainage is passive and low in efficiency is solved. The spring supplement plates between the retaining wall units can elastically adapt to uneven deformation of the side slope, stress redistribution is achieved, and the displacement can be monitored and pre-warned.

The invention belongs to the technical field of landslide prediction, and relates to a shallow earthquake-stress joint inversion tunnel portal landslide prediction method, which comprises the following steps of: obtaining slope body first-arrival wave travel time data through a high-frequency seismic source array, constructing a geologic model containing a rock mass integrity coefficient matrix, identifying rock mass structure deterioration through elastic wave velocity distribution, and predicting the landslide at a tunnel portal through shallow earthquake-stress joint inversion. The method comprises the following steps: locking a potential unstable structure weak area in advance, then embedding a rock mass integrity coefficient matrix as priori knowledge into a stress field for solving, and by establishing a coupling relationship between seismic wave propagation and stress, inverting slope stress field distribution, capturing an early stress redistribution signal caused by structural degradation of a deep rock mass, and finally obtaining an initial stress redistribution signal of the deep rock mass. Early perception of mechanical instability precursor is realized; and then calculating strain energy density distribution of the potential slip surface based on the stress and strain data, and accurately judging the potential slip surface before the slip surface is not completely cut through by judging whether the strain energy density exceeds a threshold value, whether a continuous sheet is formed and whether the expansion rate exceeds the standard, thereby avoiding lagging caused by dependence on a displacement signal.

The invention provides an oil storage cavern type section structure, a computer program product and an oil storage cavern construction method.The structure comprises seven arc sections, a bottom plate section, a second arc, a fourth arc, a sixth arc and a third arc, wherein the first arc at the top of a cavern is equally divided by the central axis of a cavern section, and the second arc, the fourth arc and the sixth arc are sequentially connected with one end of the first arc in an end-to-end tangent mode; a third arc, a fifth arc and a seventh arc which are sequentially and tangentially connected with the other end of the first arc end to end are symmetrically distributed along the central axis of the cavern section; the bottom plate section is tangentially connected with the tail ends of the fifth arc and the sixth arc respectively; chords of all the arc sections are located in the cavern; and the length between the second arc tail end and the third arc tail end is the span of the cavern. The structural contour line has no small curvature radius, stress in all directions around the cavern is uniformly distributed, stress concentration generated by sharp corners is avoided, and long-term stability of surrounding rock of the oil storage cavern can be ensured; during construction, disturbance to surrounding rocks is small, stress redistribution is better, and the problem that the stability of the tunnel shape is poor under the condition that the surrounding rocks are poor is solved.

The application provides a method for determining the hole spacing of chamber blasting caving considering the effect of ground stress unloading, measures and records the original ground stress and rock mechanics parameters of the underground chamber blasting excavation engineering; establishes a stress analysis model with a slotting cavity according to the measured ground stress and caving blasting pre-design; carries out ground stress unloading calculation on the stress analysis model and establishes a ground stress redistribution model; constructs an explosion stress wave propagation model according to the rock material parameters and explosive material parameters and calculates the explosion stress superposition field between adjacent caving holes; calculates the maximum hole spacing of adjacent holes of caving blasting producing through cracks according to the rock strength fracture criterion. Through the calculation and analysis of the maximum effective distance of hole cracking under the coupling effect of ground stress redistribution and explosion load, the hole spacing design is avoided to be too small to cause large surrounding rock damage, the hole spacing design is avoided to be too large to be insufficient to form through cracks between holes, and the expected blasting excavation effect cannot be achieved.

The invention relates to the technical field of building construction, in particular to a progressive expansion anchor rod suitable for a hard rock stratum and a construction method of the progressive expansion anchor rod. The device comprises an anchor rod and a sleeve expansion body barb, a main body of the sleeve is of a cylindrical structure with a certain length, and a plurality of control clamping holes are formed in the wall of the sleeve in the length direction of the sleeve. An internal thread is processed on the inner wall of the sleeve; the expanding body barb is inserted into the control clamping hole; an external thread matched with the internal thread of the sleeve for use is processed on the outer wall of the anchor rod; and the anchor rod is inserted into the sleeve and is fastened and screwed through threads, and the barb of the expansion body is extruded outwards. According to the technical scheme, the problem that in the prior art, a resin anchoring anchor rod is insufficient in bonding strength is solved; a mechanical expansion anchor rod is complex in structure and difficult to install, and the anchoring force cannot be gradually enhanced; the disposable expansion design of the expansion anchor rod cannot adapt to the stress redistribution process of the rock mass, and particularly, the problems that the anchoring force is attenuated due to creep deformation of the rock mass in a deep high ground stress environment and the like are solved.

The invention relates to the technical field of underground engineering support, and discloses an anchor rod active prestress releasing system for deep surrounding rock stability control, which comprises an anchor rod body, a prestress applying assembly, a surrounding rock state monitoring assembly, a prestress executing and releasing assembly and a central control unit. One end of the anchor rod body is anchored to the bottom of a deep surrounding rock preset drill hole, and the other end of the anchor rod body extends out of the drill hole. The prestress applying assembly is arranged at the end, extending out of the drill hole, of the anchor rod body in a sleeving mode and used for applying initial prestress to the anchor rod body. Surrounding rock stress and displacement data are collected in real time through the surrounding rock state monitoring assembly, the central control unit automatically judges and drives the prestress executing and releasing assembly to act according to a preset threshold value, and the limitation that a traditional anchor rod cannot be adjusted according to dynamic changes of surrounding rock after prestress is applied is broken through. And stress redistribution generated by excavation disturbance of the deep surrounding rock can be adapted in time.

The application discloses a load-bearing wall structure optimization design method based on parameterized modeling and belongs to the technical field of building structure design optimization. The method comprises the following steps: obtaining geometric boundary parameters, material attribute parameters and connecting node parameters of a load-bearing wall, and generating an initial wall parameter set; constructing a multiscale initial grid model comprising macroscopic scale grids and microscopic scale grids; applying a load boundary condition to perform nonlinear iterative solving to obtain a wall stress redistribution trajectory; identifying a high stress gradient area according to the stress redistribution trajectory, performing reverse correction on the initial wall parameter set by using regional local parameters and iteratively converging to generate an optimized wall parameter set. The method can accurately simulate local stress concentration at the connecting node, realize adaptive parameter optimization based on a stress transmission path, and improve design efficiency and structural economy.

The present invention belongs to the field of infrastructure technology, specifically a construction method for a subway underground excavation station project. The construction technology of the subway underground excavation station project is initially developed through research methods such as technical investigation, theoretical analysis and numerical simulation, advanced geological prediction, field experiments and field tests, induction and summary, technical refinement, and reference to a large number of foreign technologies. At the same time, the current status of similar engineering and technical research and application at home and abroad is also fully grasped. Furthermore, the causes of excavation accidents are analyzed. Based on various investigations and analyses, a detailed research outline and work plan are formulated. Furthermore, theoretical analysis and numerical simulation methods are used to study the surrounding rock stress redistribution and displacement distribution law and the force characteristics of the support structure during the pilot tunnel excavation process; so that the construction technology of the subway underground excavation station project in the present invention can be carried out quickly and safely step by step during execution, ensuring the completion time and quality.

The invention relates to the technical field of computer-aided engineering modeling, in particular to a prediction method and system for floor external corner cracks, and the method comprises the steps: collecting real-time temperature change data, concrete shrinkage deformation data, humidity information and sunlight intensity information of a floor external corner area; according to the method, a dynamic coupling model of temperature stress and concrete shrinkage is constructed, the influence coefficient of the temperature on the shrinkage rate and stress redistribution are calculated in real time in combination with a mechanical association algorithm, and the problem that dynamic interaction is not reflected due to independent calculation of the temperature stress and the concrete shrinkage in an existing method is solved; and then environment self-adaptive correction is performed on the model according to the humidity and the sunlight intensity, the sensitivity parameter and the temperature stress transmission attenuation coefficient are adjusted, and the defect that the real-time influence of environment factors is not included in an existing method is overcome.

The invention provides a method for determining the detonation speed of an explosive used for tunnel caving blasting by considering the influence of ground stress, and belongs to the technical field of blasting engineering and rock mass mechanics. Comprising the steps of obtaining rock mass mechanical parameters, blasting parameters and crustal stress data; establishing a stress analysis model based on ground stress and a blasting design drawing; establishing a crustal stress redistribution model caused by a cut cavity in the model, calculating radial pressure stress generated by crustal stress redistribution among the caving holes, and drawing a polar coordinate graph; establishing a collapse inter-hole explosion stress superposition model, and calculating circumferential tensile stress generated by explosion at the central points of the two holes; and based on the dynamic tensile strength and stress state of the rock, establishing a strength criterion for forming the inter-hole through crack, and deducing and solving the minimum explosive detonation speed required by the criterion. The blasting joint forming quality is effectively improved, back break is controlled, surrounding rock damage is reduced, and the safety, economical efficiency and reliability of blasting engineering are improved.

The invention provides a manufacturing method of a large slotted welding impeller, belongs to the technical field of impeller machining, and aims to solve the problem of deformation caused by redistribution of internal stress of the slotted welding impeller in a heat treatment process. The manufacturing method of the large slotting welding impeller comprises the steps that S1, the impeller cover and the impeller disc are subjected to pre-welding machining; s2, the wheel cover and the wheel disc are welded together through the lap joint seam allowance, and an impeller is formed; s3, post-heat treatment and stress relief treatment are conducted on the impeller; s4, a lap joint spigot of the impeller cover and the impeller disc is removed, so that an outlet is formed in the circumferential direction of the impeller; s5, shot blasting treatment is conducted on the impeller; s6, the impeller is machined before heat treatment, and the impeller with the non-uniform allowance and the structure before heat treatment is formed; s7, the impeller is subjected to heat treatment; and S8, the impeller is subjected to finish machining so that the design size can be achieved. According to the method, the deformation risk of the impeller in the heat treatment process is effectively reduced, and the manufacturing precision and the quality stability of the large slotting welding impeller are improved.

The invention belongs to the technical field of material science foundation, and discloses a single twinborn system dominated twinborn transmission probability prediction method. According to the method, aiming at the condition that a single twin system is started preferentially under specific texture and force field conditions, the uniqueness of the twin system is limited and activated, and a three-dimensional matrix expression system of specific twin system spatial orientation is constructed. And based on a judgment rule that twin crystal faces and twin directions of the two crystal grains are parallel, calculating the minimum orientation difference capable of realizing parallel twin systems among the crystal grains. According to the method, the twinborn orientation difference is provided as a key physical quantity for quantifying the twinborn transmission capability, and the regulation and control mechanism of single twinborn system activation on local stress redistribution is disclosed by eliminating the interference of a non-activated twinborn system. The method is applicable to a twin-dominated deformation system at low temperature or high strain rate, and provides a micromechanical basis for optimizing strain coordination at the grain boundary.

This invention belongs to the field of tunnel and underground engineering structural safety testing technology, specifically relating to an indoor test bench and method for simulating rock mass unloading deformation and active-passive coordinated support in a tunnel model. The test bench includes a reaction bearing frame, multiple radial loading components arranged circumferentially along the reaction bearing frame, and a bottom support component. The radial loading components can independently set and maintain their loading displacement or equivalent load, and can perform zoned unloading / unloading and reloading according to a preset zone sequence to simulate the unloading deformation path and stress redistribution of the surrounding rock caused by tunnel excavation. This invention enables controllable indoor reproduction of the entire process of surrounding rock unloading path—active support sequence—passive lining failure, providing a test platform for support optimization.

The invention provides an inter-panel ore pillar bidirectional pressure relief mining method based on hanging wall and footwall surrounding rock roadways, and belongs to the technical field of mining engineering.The inter-panel ore pillar bidirectional pressure relief mining method comprises the steps that S1, a hanging wall pressure relief roadway and a footwall pressure relief roadway are tunneled in stable surrounding rock on one side of a hanging wall and one side of a footwall of an inter-panel ore pillar respectively, and the axes of the two pressure relief roadways are parallel to the walking direction of the inter-panel ore pillar; s2, the hanging wall pressure relief roadway and the footwall pressure relief roadway serve as safe operation spaces, and a rock drilling device drills pressure relief drill holes in the direction of the contact boundary of the ore pillar and the surrounding rock; stress sudden rise caused by stress redistribution of the other side due to single-side pressure relief is avoided in the step S1, the design that pressure relief drill holes are drilled in the step S2 till the pressure relief drill holes completely penetrate through the contact boundary of the ore pillar and the surrounding rock is combined, and therefore a mitigation fissure zone is formed in the contact boundary, stress in the inter-plate ore pillar is effectively released, and the stability of the inter-plate ore pillar is improved. The invention provides the method for releasing the internal stress of the ore pillar, which is low in cost and can maintain the original bearing capacity of the inter-plate ore pillar.

The invention relates to the technical field of coal mine safety mining, and discloses a lateral roof double-area pre-cut seam pressure relief method and system, and the method comprises the steps: measuring the range of a surrounding rock loosening circle to solve an initial pressure relief position; establishing a stress dynamic monitoring array in a section coal pillar, collecting data in real time and extracting a stress concentration peak value distance of a solid coal side; preferentially determining the vertical height of the pressure relief horizon according to the geological parameters and the overlying strata structure; calculating first-stage parameters such as a drilling deflection angle based on the variables, and preferentially performing seam cutting on the entity coal side of the adjacent working face; the stress redistribution state is tracked in the observation window period, the corrected peak value distance of the auxiliary transportation entry retaining side is obtained, and according to the corrected peak value distance, second-stage parameters are solved, and differential joint cutting is completed. According to the method, a dynamic closed-loop feedback mechanism is constructed through a double-region and step-by-step time sequence strategy, it is ensured that the joint cutting position is accurately matched with the mining-induced stress extreme value region all the time, high stress transmission is effectively blocked, and the problem of surrounding rock instability induced by lateral bearing pressure superposition is solved.

The invention discloses a yielding supporting structure suitable for a deep shaft and a construction method of the yielding supporting structure. The yielding supporting structure comprises a peripheral drainage system, a shaft wall drainage system, a stress regulation and control channel and a construction channel. The peripheral drainage system is arranged on the periphery of the deep shaft, and the shaft wall drainage system is arranged on the outer edge of the shaft wall; the stress regulation and control channel is a yielding raise well formed in the direction of the maximum horizontal principal stress, and the well wall stress in the direction is reduced through surrounding rock stress redistribution; and the construction channel is used for providing an operation space for the construction of the stress regulation and control channel. A coupling structure of an advanced drainage drill hole, a well wall gridding drainage system and a directional yielding raise well is arranged; a traditional grouting and water plugging process is replaced with a double-drainage system, and the seepage water pressure is remarkably reduced; the yielding raise-boring cooperation drainage system releases surrounding rock stress, and the risk of high-pressure water burst is avoided; meanwhile, asymmetric stress distribution of surrounding rocks is transformed, and well wall stress uniformity is remarkably improved; and well wall cracking caused by local stress concentration is avoided, and the thickness of well wall concrete is reduced.

The invention relates to the technical field of land subsidence disaster early warning, in particular to a land subsidence micro-motion monitoring system and method. The system comprises a geomechanical model construction module, a micro-motion event interpretation module, a damage-stress coupling evolution module and a risk probability prediction module. The system obtains seismic moments by interpreting a micro-seismic event in real time; the core of the method is that a current accumulated damage factor, real-time shear stress and normal stress are solved by applying a damage amplification effect based on seismic moments and historical accumulated damage factors, and a time-varying instability risk index and an instability probability are predicted; according to the method, discrete micro-seismic data are assimilated into continuous damage accumulation and stress redistribution processes in the rock-soil body, and conversion from passive recording to internal state quantitative early warning is achieved.

This application belongs to the field of landslide prediction technology, and relates to a method for predicting landslides at tunnel entrances using shallow seismic-stress joint inversion. This invention acquires first-arrival wave travel time data of the slope using a high-frequency seismic source array, constructs a geological model including a rock mass integrity coefficient matrix, identifies rock mass structural deterioration through elastic wave velocity distribution, and identifies potential unstable structural weak areas in advance. Then, the rock mass integrity coefficient matrix is ​​embedded as prior knowledge into the stress field solution. By establishing the coupling relationship between seismic wave propagation and stress, the stress field distribution of the slope is inverted, capturing early stress redistribution signals caused by structural deterioration in deep rock masses, achieving early detection of precursors to mechanical instability. Furthermore, based on stress and strain data, the strain energy density distribution of the potential slip surface is calculated. By judging whether the strain energy density exceeds a threshold, whether it is continuous, and whether the expansion rate exceeds the standard, the potential slip surface can be accurately identified before it is fully connected, avoiding the lag caused by relying on displacement signals.

The present invention discloses a BIM-based intelligent construction process monitoring method and system, belonging to the field of intelligent construction technology. By constructing a BIM corresponding to the underground excavation construction site of the subway station conversion section, and performing finite element analysis on the underground excavation construction site of the subway station conversion section based on the BIM, stress concentration areas are determined, and then safety influencing factors corresponding to the stress concentration areas are collected, and a pre-deployed machine learning model is used to identify the safety influencing factors, and support structure optimization data is determined. Finally, the support structure optimization data is transmitted to on-site workers, so that the on-site workers can carry out construction according to the support structure optimization data, thereby realizing dynamic optimization of support structure parameters, being able to adapt to the surrounding rock stress redistribution process, and effectively ensuring construction safety.

The present application relates to the field of ground subsidence disaster early warning technology, in particular to a ground subsidence micro-motion monitoring system and method thereof; comprising a geomechanical model construction, micro-motion event interpretation, damage-stress coupling evolution, risk probability prediction module; the system obtains seismic moment by real-time interpretation of microseismic events; the core is based on seismic moment and historical cumulative damage factor, applying damage amplification effect, calculating the current cumulative damage factor, real-time shear stress and normal stress, and predicting time-varying instability risk index and instability probability; the present application assimilates discrete microseismic data into continuous damage accumulation and stress redistribution process in rock-soil body, realizing the change from passive recording to internal state quantitative early warning.

The invention provides an expressway engineering construction real-time monitoring method and system based on big data, and the method comprises the steps: collecting the initial stress and deformation data of a supporting system in an installation completion state before concrete is poured, and constructing a stress monitoring reference; in the continuous concrete pouring process, real-time stress and deformation data of a supporting system are collected according to the construction stage, the increment of the real-time stress and deformation data relative to a stress monitoring benchmark is calculated, and a stress increment time sequence data set bound with the construction process is formed; analyzing the change trend and distribution relation of the internal force of the support system based on the stress increment time sequence data set, identifying the stress redistribution phenomenon, and evaluating the distance between the current state and the bearing limit to judge the critical state; according to the method, the construction mechanics principle and real-time data can be deeply fused, the internal stress evolution law of a supporting system is informed, and advanced early warning and decision guidance are achieved in the invisible risk stage.

The application discloses a kind of soft interlayer containing slope reinforcement device and method thereof, belong to geotechnical engineering slope reinforcement technical field, including retaining wall and anchor cable, unit is equipped with supplementary plate and is elastically connected, there is water storage component in the side of slope near retaining wall, water tank is arranged at the top of retaining wall, there is water suction component extending to the slope in retaining wall, push component contains connecting barrel, connecting ring, outer ring, flexible pad, bellows, pump body is connected with water suction pipe through three-way pipe in water tank place drainage underground main pipe;The application realizes supporting, anchoring and drainage cooperation by integrating modular multiple retaining wall units, prestressed anchor cable and deep drainage system, overcomes the poor synergy of traditional measures. The setting of water suction component, the active suction of pump body, efficient reduction of pore water pressure, solves the problem of passive inefficiency of traditional gravity drainage. Spring supplementary plate between retaining wall units can elastically adapt to uneven deformation of slope, realize stress redistribution, and its displacement can be monitored and early warned.

The application provides a calculation method of a crown arch surrounding rock collapse depth considering excavation unloading stress redistribution, comprising the following steps: step S1: a triangular formula is used to calculate the collapse arch height before excavation; step S2: a tunnel radius, surrounding rock bulk density, cohesive force and internal friction angle are collected; step S3: stress decomposition and stress redistribution analysis are carried out after excavation, and the crown arch surrounding rock collapse depth is obtained. The crown arch surrounding rock collapse cavity depth of the tunnel can be more accurately predicted, the surrounding rock support force is determined, and a reasonable dynamic design basis is provided for the tunnel construction through a fault fracture zone.

The present application belongs to the field of geotechnical engineering disaster prevention and mitigation and earthquake engineering test technology, and relates to a shaking table test method considering time-varying degradation of seismic performance of anchored rock slope. The method first constructs a dynamic performance time-varying degradation model based on the attenuation law of the interface bonding force of the anchoring system and the yield resistance of the free section reinforcement; by adjusting the proportion of the rock similar material and using a staged stiffness anchoring system, the physical equivalent simulation of interface degradation and component yield resistance reduction is realized respectively. The core of the present application is that before the shaking table applies the seismic wave, the anchoring performance degradation of the supporting structure is simulated actively in advance, so as to reproduce the real evolution path that the bearing capacity of the anchoring system decreases first, leading to stress redistribution and cumulative damage of the slope, and then suffering from sudden seismic load, breaking through the limitation of traditional test which only simply simulates static low bearing capacity. The present application effectively realizes the space-time coupling of "static time-varying degradation accumulation" and "instantaneous seismic dynamic action", solves the problem of simulation distortion of interface degradation, and provides a reliable test method for dynamic stability evaluation and reinforcement design of long-term service anchored slope.