29 results about "Soil arching" patented technology

The present application relates to the field of civil engineering and computer-aided design technology, and particularly relates to a method for determining non-limiting active earth pressure of a retaining wall in complex terrain. The method comprises the following steps: obtaining and spatially discretizing original survey data to form a set of parameterized grid points; constructing a reference pressure grid using the set of parameterized grid points; extracting elevation information of each grid element in the reference pressure grid, locally fitting the elevation information to a surface, and calculating the principal curvatures of the terrain surface to form a terrain curvature spectrum; analyzing the curvature distribution of the curvature characteristic region in the terrain curvature spectrum to obtain statistical characteristics of the curvature distribution; and analyzing the soil arching effect according to the statistical characteristics of the curvature distribution to obtain soil arching curvature influence law data. The present application converts complex three-dimensional boundary conditions that are difficult to handle into an accurately quantifiable terrain curvature spectrum, thereby improving the safety and economy of retaining wall design under complex terrain conditions.

The invention discloses an interface soil pressure detection device and method based on a stress ring, a pressure gauge comprises an outer protection cover, an upper bearing plate, an upper supporting plate, a fixing plate, an extension rod, the stress ring, a bearing ring, a lower supporting plate, a lower bearing plate and a one-way hinge, the outer protection cover is a protection cover when the interface pressure gauge is used, the damage to the pressure gauge is reduced, and the reliability of the interface pressure gauge is improved. Pressure is borne by the upper force bearing plate and the lower force bearing plate, measurement is carried out through deformation of the stress ring in the middle of the interface pressure gauge, and the one-way hinge is used for converting the pressure of the upper force bearing plate into resultant force and uniformly transmitting the resultant force to the stress ring. And the soil arching effect caused by the pressure film sinking below the pressure gauge shell is avoided. According to the invention, a set of multi-stage decoupling interface stress transmission and sensing architecture is constructed, thorough immunity to bending moment and shear interference is realized, and the technical problem that the traditional pressure gauge fails due to unbalance loading and soil body effect is fundamentally solved.

The application discloses a soil arching effect degradation rate prediction method based on a stratum characteristic curve, and aims at solving the problem that the soil arching effect degradation caused by double-line tunnel excavation is difficult to quantitatively characterize. S1, discrete and parameter vectorization are carried out on the monitoring data of the double active door test; S2, an analytical expression of the stratum characteristic curve above the left and right active doors is constructed, and initial boundary conditions and limit stable boundary conditions are determined; S3, a physical guide neural network is constructed, the network parameter iterative optimization is guided through a comprehensive loss function, and optimal fitting parameters and an optimal analytical expression of the stratum characteristic curve are output; S4, the soil arching effect degradation rate η is calculated and constructed, and the quantitative prediction of the degradation degree is completed. The dual guarantee of data fitting accuracy and physical interpretability is realized, and the non-dimensional index of the output degradation rate fills the blank of the unified quantitative index of the soil arching effect degradation under secondary unloading, and can serve the stratum disturbance risk assessment and safety control of the double-line tunnel underpass project.

The application provides a waste concrete sleeper roadbed reinforced combined structure based on waste concrete sleepers, which comprises waste concrete sleepers provided with through holes at two ends, and comprises a plurality of strip structure units laid in parallel, wherein the strip structure unit comprises superposed upper layer structures and lower layer structures, the upper layer structure comprises upper layer structure units connected in a head-to-tail mode, the lower layer structure comprises lower layer structure units connected in a head-to-tail mode, the upper layer structure unit is connected with the lower layer structure unit through a connecting piece one, and the strip structure units are connected through connecting pieces two; and the application also provides a design method of the waste concrete sleeper roadbed, wherein the soil arching effect can be formed when the soil covering thickness is greater than or equal to 1.6 m and the optimal soil covering filler strength is that the internal friction angle is greater than 25 DEG and the cohesion is 8 kPa, and the soil arching effect is beneficial to be formed when the length of the waste concrete sleeper is 2.6 m and the spacing between the sleepers is 1.5 m-2.0 m.

The invention discloses an inner support type foundation pit supporting soil pressure calculation method based on an asymmetric soil arching effect, and relates to the technical field of geotechnical engineering.The method comprises the steps that S1, a sliding surface model described in a logarithmic spiral shape is established, a soil body behind a supporting structure is divided into an upper area influenced by the soil arching effect and a lower area not influenced by the soil arching effect, and the upper area is divided into a sliding surface model; s2, introducing an asymmetric soil arch calculation model considering principal stress deflection in the upper region, constructing an arch differential unit along a large principal stress track, and analyzing a soil stress state based on a stress Moire circle, S3, respectively carrying out stress analysis on the differential units in the upper region and the lower region, solving soil pressure distribution of the support structure, and calculating the soil pressure distribution of the support structure. S4, calculating resultant force of soil pressure borne by the supporting structure and the position of an action point of the resultant force; according to the method for calculating the supporting soil pressure of the inner supporting type foundation pit under the asymmetric soil arching effect, a scientific theoretical basis and a practical engineering method are provided for design of a foundation pit supporting structure under a soft foundation and a complex environment.

The invention relates to the technical field of intelligent tests of geotechnical engineering, in particular to a physical effect co-evolution analysis method and system for a pile-supported reinforced embankment, and the method comprises the following steps: fitting the pile-supported reinforced embankment through a model box, a soil body sample and a reinforced material, and constructing a test condition; performing multi-modal data acquisition by using the sensor array to obtain a multi-source test data set; performing data preprocessing and feature extraction to obtain a soil arching effect feature set and a tensile membrane effect feature set; constructing a machine learning model, and obtaining a machine learning training model through the model training data; and obtaining a to-be-analyzed physical effect feature set, and obtaining a physical effect co-evolution analysis result in combination with the machine learning training model. Controllable simulation of the soil arching effect degradation and tensile membrane effect enhancement process is achieved, quantitative evaluation is conducted on structure stress and deformation response under different reinforcement rigidity conditions, and a test and prediction basis is provided for reasonable selection and optimal design of a reinforcement material.

This invention relates to the field of intelligent testing technology in geotechnical engineering, and in particular to a method and system for the co-evolution analysis of physical effects in pile-supported reinforced embankments. The method includes the following steps: fitting a pile-supported reinforced embankment using a model box, soil samples, and reinforcing materials to construct test conditions; acquiring multi-source test datasets through multi-modal data acquisition using a sensor array; performing data preprocessing and feature extraction to obtain soil arching effect feature sets and tensile membrane effect feature sets; constructing a machine learning model and obtaining a machine learning training model using model training data; acquiring the physical effect feature set to be analyzed, and combining it with the machine learning training model to obtain the co-evolution analysis results of physical effects. This invention enables controllable simulation of the degradation of soil arching effect and the enhancement of tensile membrane effect, and provides a quantitative evaluation of the structural stress and deformation response under different reinforcement stiffness conditions, offering experimental and predictive basis for the rational selection and optimized design of reinforcement materials.

The invention provides a longitudinal non-uniform deformation calculation method and system for a corrugated steel plate supporting structure, and belongs to the technical field of traffic infrastructure structural design. Comprising the steps that an orthotropic equivalent stiffness model of a corrugated steel plate is constructed, a corrugated steel plate supporting structure is equivalent to a Timoshenko beam, and equivalent section bending stiffness and equivalent section shear stiffness are calculated; the method comprises the following steps: by constructing a calculation model of longitudinal non-uniform deformation, determining longitudinal differential load distribution according to an actual soil covering condition and a soil arching effect above a corrugated steel plate supporting structure; and calculating the longitudinal difference load distribution based on the longitudinal non-uniform deformation calculation model to obtain the longitudinal non-uniform deformation of the corrugated steel plate supporting structure. According to the method, the longitudinal non-uniform deformation of the shallow-buried corrugated steel plate supporting structure can be effectively and rapidly evaluated.

The utility model relates to the technical field of pressure detection, in particular to an earth pressure cell with a wing plate. Comprising an earth pressure box and a pressure box wing plate, the earth pressure box is of a cylindrical structure, a center hole is reserved in the center of the pressure box wing plate, the center hole of the pressure box wing plate is a round hole, the earth pressure box is arranged in the center hole, and the thickness of the pressure box wing plate is the same as that of the earth pressure box. The device enables the rigidity of the force measuring surface of the soil pressure box to be consistent with that of the wing plate. The structure effectively eliminates the stress concentration phenomenon caused by stiffness mutation in traditional measurement, and has remarkable technical advantages in the aspects of weakening the soil arching effect and improving the measurement precision. The utility model is mainly applied to the field of earth pressure cells with wing plates.

The invention belongs to the technical field of tunnel construction, and particularly discloses a pile foundation-joist-arch protection structure for an orthogonal shallow landslide section of a tunnel portal and a construction method.According to the pile foundation-joist-arch protection structure for the orthogonal shallow landslide section of the tunnel portal, a pile foundation penetrates into bedrock, a pre-stressed anchor cable is arranged to actively cut off the sliding force of the landslide, and a joist is connected with the pile foundation and a protection arch to form an overall stress frame; the protective arch is formed by pouring a profile steel arch frame and reinforced concrete and covers back pressure earthwork to enhance the anti-sliding capacity. The matched water interception blind ditch and the gravel drainage cushion layer cooperatively drain underground water, and the grouting area forms a soil arching effect through high-pressure grouting to transmit sliding force to the pile foundation. The construction method comprises the steps of geological supplementary survey, retaining wall construction, pile foundation and joist pouring, protection arch segmented alternate warehouse construction, slip mass grouting and the like. According to the technical scheme, a point-line-plane integrated space frame system is constructed, the problem that a traditional support is difficult to resist bias load is effectively solved, accurate control over surrounding rock deformation is achieved, meanwhile, the space utilization rate is optimized through the straight wall type design, and a safe and reliable overall solution is provided for a tunnel portal to penetrate through a shallow landslide section.

The application discloses an interface soil pressure detection equipment and method based on a stress ring, and the pressure gauge comprises an outer protective cover, an upper bearing plate, an upper supporting plate, a fixed plate, an elongated rod, a stress ring, a supporting ring, a lower supporting plate, a lower bearing plate and a one-way hinge, wherein the outer protective cover is a protective cover used when the interface soil pressure detection equipment is used, damage of the pressure gauge is reduced, pressure is borne by the upper bearing plate and the lower bearing plate, measurement is performed through deformation of the stress ring in the middle of the interface soil pressure detection equipment, the one-way hinge is used for converting pressure of the upper bearing plate into a resultant force and uniformly transmitting the resultant force to the stress ring, the soil arching effect caused by the fact that the pressure film is depressed below the pressure gauge shell is avoided by guaranteeing flatness and a large surface area of the upper bearing plate. The application constructs a multi-stage decoupling interface stress transmission and sensing architecture, realizes complete immunity to bending moment and shear interference, and fundamentally solves the technical problem that the traditional pressure gauge fails due to eccentric load and soil effect.

The invention provides a steel trapezoidal pile supporting structure design method and system.The steel trapezoidal pile is a steel pile with the isosceles trapezoid cross section, and the method comprises the steps that foundation pit engineering parameters, trapezoidal pile structure parameters and soil layer mechanical parameters are obtained; according to the structural parameters of the trapezoidal pile, the section bending modulus of the trapezoidal pile is calculated; performing section strength checking calculation on the basis of the bending modulus of the section of the trapezoidal pile and a bending moment design value determined by foundation pit design; on the basis of the soil arching effect theory, in combination with soil layer mechanical parameters and a trapezoidal pile arrangement mode, pile spacing checking calculation is conducted, and the maximum allowable pile center distance is determined; and outputting design parameters of the trapezoidal pile supporting structure, wherein the design parameters comprise a pile center distance and a section strength verification result. According to the method, aiming at the mechanical property of the recyclable steel trapezoidal pile, the problems of checking calculation of the section strength and determination of the pile distance are solved, the design is improved from an empirical method to a theoretical calculation method, and technical support is provided for wide application of the novel pile type.

The invention discloses a soil pressure-strain-temperature fiber bragg grating sensor for a soil arching effect of transparent soil and a distributed monitoring system. The soil pressure-strain-temperature fiber bragg grating sensor and the distributed monitoring system are used in a spring movable door soil arching effect transparency model test device. In the monitoring system, a plurality of gratings with different reflection center wavelengths are inscribed in an optical fiber in an optical fiber grating sensing array at intervals, and the plurality of gratings are packaged in a packaging shell. The packaging shell comprises a packaging shell I, a packaging shell II, a packaging shell III and a packaging shell IV. When the optical gratings are packaged in the packaging shells I, II, III and IV, the optical gratings are used as different sensors respectively. Compared with a traditional soil pressure sensor and a strain gauge, the volume is smaller, and the influence on a soil body is reduced; meanwhile, the optical fiber grating sensor is used in series connection, multiple point positions and multiple physical quantity data can be measured only through one optical fiber, the optical fiber grating has high electromagnetic signal interference resistance, and the problems that a traditional sensor is complex in circuit and prone to being affected by electromagnetic interference, and data are affected are solved.

The invention relates to the technical field of slope engineering test devices, and provides an experimental device and method for studying the soil arching effect of an anti-slide pile. Two model boxes of the experimental device are arranged on the two sides of a loading system, and the bottom of each model box is provided with a model pile through a flange connecting plate and a flange plate; therefore, the flange connecting plates can be quickly replaced according to different pile distance conditions to achieve pile distance adjustment. The loading system comprises a loading testing machine, a spherical pressure head, a distribution beam, an electric control telescopic device, a loading plate, a control system and a force sensor; the two model boxes are loaded synchronously, the control system monitors vertical loads on the two sides through the force sensor, the electric control telescopic device is controlled to adjust the telescopic amount according to the force value difference, and the loading error is kept within a preset error. The data monitoring system comprises a resistance strain gauge, a displacement meter, a soil pressure box and a data acquisition instrument, and can obtain parameters of pile body strain, pile top displacement, soil deformation and soil pressure. By adopting the method of the device, the interaction between the slide-resistant pile and the soil body and the soil arching effect rule under different working conditions can be simulated.

This invention discloses a method for calculating active earth pressure on finite-width soil masses considering the soil arching effect. Assuming a finite-width soil mass exists between two foundation pits, L and R, distributed to the left and right, the calculation of the active earth pressure on the wall adjacent to the finite-width soil mass in foundation pit L includes the following steps: determining the location of the sliding surface of the finite-width soil mass between the foundation pits; dividing the sliding soil mass into an upper rectangular region 1 and a lower triangular region 2 based on the sliding surface; taking a rectangular micro-element along the depth of the soil mass in region 1; establishing an equilibrium equation based on the assumption that the sliding soil mass is in an active limit equilibrium state, combined with the stress and vertical stress on the micro-element subjected to the wall and soil; applying the vertical stress at the bottom of region 1 as a load q1 to the top of region 2; analyzing the force on the trapezoidal micro-element along the depth of region 2 and establishing an equilibrium equation; solving for relevant parameters on the entire wall, providing a more reasonable basis for the design of foundation pit support structures under finite-width soil conditions.

The application discloses an indoor intelligent pile-bearing embankment grouting simulation device, an intelligent control system is connected with a slurry preparation system and a grouting system, efficient connection and intelligent management of each equipment in the slurry preparation system and the grouting system can be realized, a cement bin of the slurry preparation system is provided with powdery cementitious materials, the powdery cementitious materials are pumped into the grouting system after being stirred with water, a pile body, a soft soil foundation, embankment filling and a monitoring element of the grouting system are all located in a model groove, a plurality of pile bodies are uniformly arranged in the model groove, embankment filling is arranged on top of the pile bodies, the soft soil foundation is filled between adjacent pile bodies, a bottom of a grouting pipeline is located in the soft soil foundation, the monitoring element is arranged in the embankment filling, the grouting system is grouted after a soil arching effect is formed in the model groove, the powdery cementitious materials are re-determined, and the next group of tests is carried out. The device integrates the intelligent control system, the slurry preparation system and the grouting system, and can accurately simulate influence laws of different grouting processes on the soil arching effect of the pile-bearing embankment.

The utility model relates to a reservoir landslide anti-slide pile soil arching effect visualization test device, which comprises a model box, a simulation bedrock layer, a simulation pile, a soil body, a loading system, an image acquisition system and a water level control system, the simulation bedrock layer is arranged at the inner bottom of the model box, the soil body is arranged on the simulation bedrock layer, the simulation pile is anchored at the upper end of the simulation bedrock layer, and the loading system is connected with the image acquisition system. The upper part of the simulation pile is embedded in a slope surface of a soil body, the loading system is in contact with the other end of the soil body and is used for loading a transverse force, the image acquisition system is used for acquiring image data of the soil body and the simulation pile, a plurality of groups of soil pressure measurers are arranged in the soil body, one side, close to the loading system, of the simulation pile is provided with a soil pressure measurer, and the water level control system is arranged on the model box. And moisture detectors are arranged at different depths in the soil body. The device has the advantages that the structural design is reasonable, complex working conditions in actual engineering can be simulated more accurately, and the practicability of the test device and the reliability of test results are improved.

The application discloses a tunnel excavation face limit support force calculation method based on a whole analysis method, and comprises the following steps: step 1: a limit support force calculation model of an excavation face is proposed based on the whole analysis method; step 2: according to the theoretical model, a calculation formula of the limit support force of a shield excavation face is derived; and step 3: a corresponding loose zone model of a shield tunnel damage is proposed, wherein the model comprises a shallow-buried shield tunnel damage model and a deep-buried shield tunnel damage model. The whole analysis method is applied to the excavation face stability problem, and a calculation model of the excavation face stability is established. According to the tunnel deep and shallow burying, an elliptic cylinder-type general arch model considering the soil arching effect is established. The limit support force obtained by the application presents a consistent development trend with the numerical simulation and the existing theoretical results. In addition, the calculation time of the analytical solution is far less than the calculation time of the numerical simulation, and a new idea is provided for the design of the limit support force of the excavation face.

The invention discloses a portal type anti-sliding pile for a soft soil foundation, a causeway and a construction method of the causeway. The anti-sliding pile structure comprises a portal structure, front-row anti-sliding piles and rear-row anti-sliding piles, the portal structure is located on the outer side of the causeway, and the front-row anti-sliding piles and the rear-row anti-sliding piles are arranged on the lower surface of the portal structure to form a space stress system. The causeway structure further comprises a causeway foot structure, a causeway body structure and an upper structure, and an overall anti-sliding and deformation control system is formed. The construction method comprises the steps of early-stage design, foundation treatment, pile foundation and portal construction, monitoring equipment arrangement, embankment body structure construction and the like. Soil pressure is transmitted to the anti-sliding piles through the soil arching effect, landslide thrust is dispersed through the portal structure, the overall stability and the anti-sliding capacity of the soft soil foundation are remarkably improved, meanwhile, good drainage performance, deformation coordination capacity and construction monitoring convenience are achieved, and the structure is suitable for causeway projects with the limited space, the soft foundation and the high stability requirement.

The invention discloses a method for correcting a tunnel load of an aeolian sand stratum, belongs to the technical field of tunnel engineering support, and solves the problems that an existing calculation method is difficult to accurately reflect a real load distribution rule of the aeolian sand stratum and the calculation result is relatively large in deviation. The method comprises the steps of establishing a vertical stress calculation model considering the incomplete soil arching effect in an aeolian sand stratum, establishing a calculation formula of a span influence coefficient, establishing a calculation formula of a surrounding rock level influence coefficient, comprehensively considering the influence of the surrounding rock level and the tunnel span, and calculating the surrounding rock level influence coefficient based on multiple linear regression analysis. Establishing a final calculation formula of the wind-blown sand stratum tunnel surrounding rock load; according to the method, the wind-blown sand stratum tunnel load correction calculation method considering the surrounding rock level and span is established on the basis of the novel method theory, quantitative load solving based on the special physical characteristics of the wind-blown sand stratum is achieved, and a key technical support is provided for promoting scientific design and risk prevention and control of a wind-blown sand tunnel supporting structure.

The invention belongs to the technical field of foundation reinforcement, and particularly discloses a stable reinforcing method and reinforcing structure for a foundation, the stable reinforcing structure for the foundation comprises a pile machine, the pile machine comprises a round frame and a stirring part located in the round frame, and the stirring part comprises a rotating shaft, a driving part, a supporting plate and a stirring frame; the rotating shaft is located in the center of the round frame, and the bottom end of the rotating shaft vertically penetrates through the bottom face of the round frame and is in transmission connection with the top end of the drilling pipe. Through bidirectional rotation of the stirring frame, the rotating torsion bar enables the stirring plate to move up and down through the through groove, so that the moving position of the stirring plate is enlarged, cement paste in the round frame can be comprehensively stirred, and a mortar pump can conveniently extract the stirred cement paste; soil and cement paste are continuously stirred and reinforced in a rotating pipe rotating spraying mode, so that the soil behind a pit generates a more remarkable soil arching effect, a favorable supporting point is formed, and the deformation amount of a supporting structure is greatly reduced.

The invention discloses an arc-shaped inter-pile plate based on the soil arching effect and a construction method of the arc-shaped inter-pile plate based on the soil arching effect, and belongs to the technical field of geotechnical engineering and constructional engineering.The arc-shaped inter-pile plate based on the soil arching effect comprises an inter-pile plate body and pile-plate connecting nodes, and the transverse section of the inter-pile plate body is in an arc shape and protrudes towards the excavation side; the multiple inter-pile plate bodies are connected with the supporting piles through the pile-plate connecting joints. The problems that a traditional vertical type inter-pile plate is unreasonable in stress, large in material consumption and complex in construction are solved; the inter-pile plate is designed to be in an arc shape, the stress mode of the inter-pile plate is changed from bending to main compression, the soil arching effect and the compression resistance of concrete are fully utilized, and therefore the thickness and the reinforcement quantity of the plate can be obviously reduced. Meanwhile, a concrete spraying process is adopted, a soil body is used as a natural formwork, traditional formwork operation is omitted, construction is simplified, cost is reduced, and safety and integrity are improved.

This invention provides a method and apparatus for determining seismic design information of anchored sheet pile walls, which can be applied to the field of geotechnical engineering. The method includes: obtaining stiffness correction coefficients for multiple seismic earth pressure information based on the relative stiffness information between the sheet pile wall and adjacent soil; dividing the sheet pile wall into multiple continuous segments with stress characteristics along the height direction based on the peak stress value indicating stress concentration due to soil arching effect at the upper part of the sheet pile wall, the inflection point between the stress concentration zone and stress reduction zone of the sheet pile wall, the stiffness correction coefficients, and multiple seismic earth pressure information; combining the earth pressure gradient values ​​of each segment as a function of height to obtain an earth pressure gradient array characterizing the distribution of the wall along the height direction; and determining the design value of the anchor tension for reinforcing the sheet pile wall and the design value of the earth pressure mobilization depth in the passive zone at the bottom of the sheet pile wall based on the earth pressure gradient array and the equilibrium function.

The invention discloses a multi-source temperature control and graded reinforcement anti-slide pile reinforcement system for an unsaturated soil slope, and belongs to the technical field of geotechnical engineering slope reinforcement and green clean energy. The system comprises an expanded-base anti-slide pile, a geothermal heat pump circulating system, a solar heat collecting system and a monitoring system. The expanded-base anti-slide pile is arranged in a potential sliding surface area of the side slope, and a heat exchange pipe of the geothermal heat pump circulating system goes deep into a geothermal layer; the solar heat collection system is used for converting solar energy into heat energy to be stored as a supplementary heat source of the geothermal heat pump circulation system; the monitoring system monitors the slope state and adjusts temperature control parameters in real time. According to the system, the states of the anti-slide pile and the soil body around the pile are actively controlled and adjusted through clean energy, the temperature phase-change material is changed by controlling the temperature according to thrust transmitted by the soil arching effect of different depths so that reverse thrust can be provided for the soil body in a graded mode, and the soil arching effect is effectively maintained and enhanced; and a pile-soil common anti-sliding system with the cooperation of pile sliding resistance and soil arching is formed.

This invention proposes a method and system for calculating longitudinal uneven deformation of corrugated steel plate support structures, belonging to the field of transportation infrastructure structural design technology. The method includes: constructing an orthotropic equivalent stiffness model of the corrugated steel plate, treating the corrugated steel plate support structure as an equivalent Timoshenko beam, and calculating the equivalent section bending stiffness and equivalent section shear stiffness; constructing a calculation model for longitudinal uneven deformation, determining the longitudinal differential load distribution based on the actual soil cover conditions and soil arching effect above the corrugated steel plate support structure; and calculating the longitudinal differential load distribution based on the longitudinal uneven deformation calculation model to obtain the longitudinal uneven deformation of the corrugated steel plate support structure. This invention enables effective and rapid assessment of the longitudinal uneven deformation of shallow-buried corrugated steel plate support structures.

The invention relates to a visual movable door test device for soil arching effect evolution, and belongs to the technical field of tunnel engineering and geotechnical engineering.The visual movable door test device comprises a transparent model box, a movable door adjusting assembly comprises a semicircular shell cylindrical movable door block and a constant-speed loading instrument, and the constant-speed loading instrument is arranged at the bottom of the inner side of the transparent model box; the semi-circular shell cylindrical movable door block is horizontally arranged right above the constant-speed loading instrument, the two supporting plates are horizontally arranged on the two sides of the semi-circular shell cylindrical movable door block respectively, and the transparent soil is filled into the transparent model box layer by layer in the vertical direction. The constant-speed loading instrument drives the semicircular shell cylindrical movable door block to move up and down to simulate stratum loss or grouting lifting, so that the difference of the loss of the stratum caused by test and shield tunnel construction is avoided, and transparent soil is utilized to form overlying soil of a shield tunnel. And the visual observation of the gradual response of the soil body of the shield tunnel under the loss or expansion of different stratums is realized.

The invention belongs to the field of municipal engineering, and provides a road-bridge transition section capsule arrangement optimization method considering a soil arching effect, which comprises the following steps: determining geological conditions, design parameters and a settlement control target of a road-bridge transition section, establishing a finite element model of the road-bridge transition section according to the geological conditions and the design parameters, and calculating the settlement control target of the road-bridge transition section. The settlement characteristic of the road and bridge transition section under the traffic load effect is simulated, in the finite element model, a plurality of capsule arrangement schemes are preset, and the arrangement depths, intervals and grouting amounts of capsules in all the schemes are different; according to the method, the bag body arrangement of the road and bridge transition section is optimized by considering the soil arching effect, the optimal bag body arrangement scheme is screened out through finite element simulation, the optimal proportion range of the bag body distance and the embankment height is determined, the self-bearing capacity of the soil body is fully exerted, and settlement deformation is effectively controlled; and meanwhile, a high-performance grouting material with a customized ratio is researched and developed, so that the grouting material has good flowability and later strength, and the supporting and durability requirements after the capsule body is expanded are met.

The application discloses a soil arching effect degradation rate prediction method based on a stratum characteristic curve, and aims at solving the problem that the soil arching effect degradation caused by double-line tunnel excavation is difficult to quantitatively characterize. S1, discrete and parameter vectorization are carried out on the monitoring data of the double active door test; S2, an analytical expression of the stratum characteristic curve above the left and right active doors is constructed, and initial boundary conditions and limit stable boundary conditions are determined; S3, a physical guide neural network is constructed, the network parameter iterative optimization is guided through a comprehensive loss function, and optimal fitting parameters and an optimal analytical expression of the stratum characteristic curve are output; S4, the soil arching effect degradation rate η is calculated and constructed, and the quantitative prediction of the degradation degree is completed. The dual guarantee of data fitting accuracy and physical interpretability is realized, and the non-dimensional index of the output degradation rate fills the blank of the unified quantitative index of the soil arching effect degradation under secondary unloading, and can serve the stratum disturbance risk assessment and safety control of the double-line tunnel underpass project.

The invention relates to an internal force calculation method for a circular homogeneous pipe-jacking tunnel under the action of ground unbalance loading, and the method comprises the steps: firstly converting ground single-side pile load and traffic load into equivalent horizontal unbalance pressure based on a space soil arching effect and a foundation pit single-side unbalance loading model; then, a combination model is established by superposing traditional uniformly distributed loads; then, according to a 120-degree soil arc bearing angle internal force coefficient method, the bending moment and the axial force are calculated, and two kinds of load combinations of strength and deformation checking calculation are completed; and finally, circumferential reinforcement is completed according to the pure bending section and the bending section. The method fills the design blank of the unbalance loading working condition, has simplicity and engineering precision, can guarantee long-term stability of the pipe jacking tunnel under the influence of unbalance loading, and is suitable for rapid and accurate design of engineering.