83results about How to "Avoid catastrophic accidents" patented technology

The invention relates to the technical field of satellite fault diagnosis and fault-tolerant control, and proposes a fault diagnosis method, which has very good robustness to external interference, isfree of influence of external interference in a fault diagnosis process, prevents generation of misinformation and missing report, and can effectively estimate fault severity. According to the satellite fault diagnosis and fault-tolerant control method based on a self-adaptive observer, first a satellite kinematics and dynamics model under an actuator fault and external interference influence isestablished to analyze influence of fault effective factors on a system; secondly, an observer is designed for a satellite fault system, a residual error evaluation function is established based on observer output and system actual output, an evaluation threshold value is obtained, and the purpose of fault detection is achieved; then, when occurrence of a fault is detected, a self-adaptive observer is designed to complete a fault diagnosis task; and finally, based on an estimated value of the fault, a finite time self-adaptive fault-tolerant controller is designed. The satellite fault diagnosis and fault-tolerant control method based on a self-adaptive observer is mainly applied to fault diagnosis and fault-tolerant control occasions.

The invention provides an aeroengine hardware damage analysis and service life prediction method based on a damage base line. A damage database is built according to engine manual regulations and engine structure definition standard damage description rules; a damage base line model based on a linear degradation rail is built, the linear fitting is carried out on the damage data of a fleet engine, and the maximum likelihood estimation is used for solving the damage base line model parameter estimation values; the damage data of the newly obtained single engine is used for updating the damage sign model to obtain the damage increase model of the single engine; the probability density distribution function of the hardware damage increase model, i.e. the probability density distribution function of the engine rest wing time is solved for the solved hardware damage increase model of the single engine, and a median value of the probability density distribution function is taken to be used as the rest wing service life of the engine. Through the aeroengine hardware damage analysis and service life prediction method, the prediction on the engine dismounting time of the engine by airline companies according to the hardware damage of the engine becomes possible, and further, important decision support is provided for the maintenance plan making of the engine.

The invention belongs to the technical field of waterproofing plugging of tunneling overexcavation gaps, and particularly relates to a shield burial method for receiving and plugging an overexcavation gap in high-water-pressure stratum. The invention solves the problem that the existing overexcavation gap waterproofing plugging technique is not suitable for high-water-pressure stratum, has high risk for shield receiving and can easily induce accidents. The method comprises the following steps: preserving a shield receiving well; breaking the wall of the shield receiving well to chisel out an annular groove, and laying freezing pipes in the annular groove; filling water into the shield receiving well, or filling water after filling soil; impelling the shield machine until only the shell of the shield tail is still in the entrance / exit ring of the tunnel; starting freezing, and injecting grout into the overexcavation gap; pumping water when the shield receiving well is isolated from the outside confined aquifer; and after pumping water to remove silt, cutting off part of the shield tail, and lifting out the disassembled shield machine, thereby completing receiving. The invention has the beneficial effects of ensuring that the shield can be received in the high-pressure fine sand layers and other severe strata, and preventing catastrophic accidents in shield receiving in unfavorable strata.

An in-line prediction and adaptive regulation equipment for surge of compressor system is composed of dynamic pressure sensor, DC power supply, pre-amplifier analog circuit, low-pass filter analog circuit, FFT analyzing DSP module, switch analog circuit, high-speed electromagnetic unit, integrator analog circuit, analog sawtooth wave output circuit, servo motor, inlet guide blade, microregulationvalve and high-speed exhaust valve. It can prevent the surge accident to improve stability of system.

The present invention discloses a composite material pressure container for holding liquefied gas, natural gas, liquid hydrogen and liquid oxygen etc. Said container includes internal container made up by high-strength alluminium alloy thin-wall inner liner or plastic thin-wall inner liner, its exterior is covered with a layer of composite material winding band layer which is made up by impregnating prestressed incidence-winded high-strength fibre with epoxy resin base composite material, and on the outer surface of the above-mentioned composite material layer several criss-cross communicated small grooves are cut, and its exterior is covered with closed external protecting layer with leakage-detecting holes which are communicated with above-mentioned small grooves and equipped with sensors mounted on these leakage-detecting holes.

The invention discloses a method for monitoring and diagnosing equipment operation states according to a vibration algorithm. By the method, the equipment operation states can be monitored, time domains and frequency domains of vibration signals of equipment and operation trends of the equipment can be analyzed, residual service life of the equipment can be predicated according to an intelligent learning algorithm, proper signal collection strategies can be selected according to actual conditions to collect the vibration signals, change conditions of the vibration signals can be monitored, some related technical parameters can be monitored and warned, time domain waveforms of the vibration signals can be monitored, the equipment operation states can be diagnosed according to related features of the signals through signal analysis, and fault positions and fault types of the equipment can be determined. The method plays a large role in reducing maintenance cost and production cost and improving economical and social benefits, and has significance in avoiding huge economic losses and catastrophic accidents.

The invention provides a double wire automatic submerged arc welding process. The process comprises the following steps of: cleaning and fixing weldments; setting a weld groove; setting parameters of the welding process; and adjusting the position of a welding gun to weld a welding connector. The improvements of the process include: the set parameters of the welding process comprise a pre-heating magnetic field exciting current, a pre-heating magnetic field exciting frequency, an electromagnetic stirring magnetic field exciting current, an electromagnetic stirring magnetic field exciting frequency, a thermal treatment magnetic field exciting current and a thermal treatment magnetic field exciting frequency; after the position of the welding gun is changed on the welding connector, a pre-heating exciting coil is started first to generate pre-heating magnetic fields to pre-heat the welding wire and the groove; when a double wire submerged arc welding gun makes arc strike weld on a run-on plate in front of the weld seam, the electromagnetic stirring exciting coil and the electromagnetic thermal treatment exciting coil are started to generate electromagnetic stirring magnetic fields and electromagnetic thermal treatment external magnetic fields; and when the double wire submerged arc welding gun reaches a run-off plate at the tail end of the weld seam, the welding gun extinguishes arc and is lifted, and at the same time, the power supply of the electromagnetic stirring exciting coil and the electromagnetic thermal treatment exciting coil is cut off, so that the weld is completed. The comprehensive mechanical properties of the welding connector are improved.

The invention provides a fiber bragg grating sensor based intelligent flange gasket. The fiber bragg grating sensor based intelligent flange gasket is structurally provided with a metal framework (1), wherein a radial fiber bragg grating temperature sensor (4) and a peripheral fiber bragg grating strain sensor (5) are installed on the metal framework (1). The fiber bragg grating sensor based intelligent flange gasket can achieve integration of a sealing function and a monitoring function, a sealing failure state of the gasket can be timely found so as to take preventive measures for avoiding disastrous accidents, and the fiber bragg grating sensor based intelligent flange gasket can be installed and used without existing flange structure change and is suitable for an established flange system.

The invention discloses a rapid diagnosis method for the rotating stall of an axial flow compressor based on a determined learning theory, which comprises the following steps of: establishing a literal radial basis function (RBF) neural network model of the rotating stall of the axial flow compressor; establishing the mode library (including modes from a pre stall, a stall initial stage to a complete stall) of a plurality of rotating stalls; establishing a dynamic estimator of the rotating stall by utilizing a literal RBF neural network; establishing the residual error of the state of the dynamic estimator and the flow state of a diagnosed compressor; and estimating the residual error, and realizing the rapid diagnosis for the rotating stall of the axial flow compressor. The method is applicable to the rapid diagnosis for the rotating stall of the axial flow compressor, can carry out learning identification and establish the mode library for the axial flow compressor in the whole process from a normal working condition (the pre stall) to a fault working condition (the complete stall), thereby rapidly identifying the working conditions (the pre stall, the stall initial stage and the complete stall) of the axial flow compressor in the operating process in real time to realize the rapid diagnosis for the rotating stall.

The invention belongs to the technical field of subway tunnel engineering, particularly relates to a shield end tunnel portal maintenance process, and provides an economic, safe and quick method. A tunnel portal maintenance structure during originating and receiving a shield can prevent water and play a role in maintaining a soil body and is easy to remove. The process comprises the following steps of: during shield end tunnel portal maintenance wall construction, inserting a steel sheet pile into a tunnel portal position; moving the steel sheet pile up and down before initial setting of maintenance wall concrete; and when the shield is originated or received and the front end of the shield is jacked to the steel sheet pile, pulling up the steel sheet pile, and impelling the shield to finish originating or receiving. The process is simple and easy to operate, and has low manufacturing cost; and the steel sheet pile can be reused, so the process has particularly predominant economic benefit and social benefit, significance and extremely high popularization value at modern stage of vigorously building subway traffic engineering.

The invention discloses a sea area high-water-pressure shield method tunnel emergency tool change structure and a construction method. A shield tunneling machine is arranged below a freezing work platform, the freezing work platform and the shield tunneling machine are connected through a soil freezing curtain, the soil freezing curtain is composed of a front end vertical freezing structure and alower vertical freezing structure, a cutter disc is arranged on the end, facing the soil freezing curtain, of the shield tunneling machine, and the shield tunneling machine is provided with multiple shield pipe pieces. The construction method comprises the steps that the position of the shield tunneling machine is positioned, a sea freezing work platform is constructed, shield tunneling machine protection work is carried out in the shield tunneling machine, the front end vertical freezing structure and the lower vertical freezing structure are applied, positive freezing is carried out, and thefreezing effect is checked and verified; a repairing tunnel is excavated; a cutter disc cutter box is repaired in the repairing tunnel; and after repairing, a freezing pipe is pulled out. Emergency tool changing, cutter disc repairing and the like under the risk accident to the seabed shield tunnel can be achieved, the structural manner and the method process are simple, the construction risk islow, and the influence on the sea face is small.

The invention discloses an optical fiber slope dam displacement settlement monitoring system which comprises an optical fiber osmotic pressure sensor, an optical fiber displacement sensor, an optical fiber grid settlement sensor, an optical fiber water level sensor and a demodulator, wherein the optical fiber osmotic pressure sensor, the optical fiber displacement sensor, the optical fiber grid settlement sensor and the optical fiber water level sensor are connected with the demodulator through optical fiber; light emitted from a laser in the demodulator is transmitted to different sensors through optical cables; optical signals with information amount to be measured can be reflected back from the sensors; information to be measured is demodulated after the optical signals reach the demodulator to be displayed on a screen; the optical fiber osmotic pressure sensor is used for detecting information of a phreatic line; the optical fiber displacement sensor is used for detecting displacement information of a slope dam body; the optical fiber grid settlement sensor is used for detecting settlement information of the slope dam body; the optical fiber water level sensor is used for detecting the water level information of the slope dam body.

The invention discloses a drilling tool internal thread rotary detection device based on the magnetic memory effect. The drilling tool internal thread rotary detection device based on the magnetic memory effect comprises a centering structure assembly and a rotary detection assembly, wherein the centering structure assembly can enable the axis of the rotary detection assembly to be coincide with the axis of a threaded hole of a detected drilling tool joint, thereby enabling a magnetic memory sensor in the rotary detection assembly to keep a constant lift-off value in rotation measurement when abutting against the detected internal thread surface. Therefore, the drilling tool internal thread rotary detection device based on the magnetic memory effect has the characteristics of high detection precision, simple and convenient operation and the like.

The present invention discloses a rotor-bearing system pedestal looseness state assessment method. The method comprises the following steps: 1) establishing an elastic force expression in a vertical direction generated by a gap of the rotor-bearing system caused by pedestal looseness, and establishing a non-linear dynamics model of the rotor-bearing system when there are pedestal looseness faults; 2) performing Taylor expansion of the nonlinear terms to obtain a linear approximation dynamical model, and comparing the non-linear model and the linear approximation model dynamic behavior; 3) calculating the nonlinear degree of the dynamic behavior of the rotor-bearing system with different-size looseness gaps; and 4) performing nonlinear fitting of the discretization result of the nonlinearity degree value, and establishing the corresponding relation between the pedestal looseness degree and the nonlinearity degree assessment value to realize the assessment of the rotor-bearing system pedestal looseness state. The rotor-bearing system pedestal looseness state assessment method can assess the rotor-bearing system pedestal looseness state to effectively avoid the occurrence of big gap looseness condition of the rotor-bearing system and avoid the occurrence of the disastrous accidents.

The invention provides a fault arc detection device for an electric car. The fault arc detection device comprises a current transformer, a signal conversion circuit, an amplifying and filtering circuit, an analog-digital converter U306, a digital signal processor U307, a CAN communication transceiver U308 and a serial transceiver U309. The fault arc detection device for the electric car makes up the blank of fault arc detection on a high-voltage DC bus in the electric car industry. Furthermore, as the fault arc detection device can accurately and quickly detect a fault arc and notify a user of the detection result in time, the user or a remote controller can take measures in time, disastrous accidents are avoided, and the safety performance of the electric car is improved.

The present invention relates to a novel flexible composite shotcrete layer support material which comprises the following components in parts by weight: 80-100 parts of cement, 80-120 parts of sands, 100-120 parts of stones, 60-100 parts of rubber particles, 40-60 parts of coal ash, 20-30 parts of hooked end steel fibers, 50-80 parts of water, 6-7 parts of a crosslinking agent, 5-8 parts of an additive, 2-10 parts of polyamic acid resin with a solid content of 10%-25% and 3-5 parts of a 1% silane coupler solution. The prepared shotcrete layer material is greatly improved in compression strength, rupture strength and flexural toughness. The novel flexible composite shotcrete layer support material can be applied to the field of support to surrounding rocks of complex rock layers with characteristics of high stress, soft rock, expansion, flowing deformation, fault structure fracture zones, mining influence and the like or other dynamic pressure tunnel as well as the field of underground engineering of tunnels, subways and the like.

The invention discloses a marine cable aging performance testing method. The marine cable aging performance testing method comprises the following steps: selecting two common marine cables, namely, anethylene propylene rubber insulation cable and a natural butadiene styrene rubber insulation cable; carrying out a thermal aging test on the cables at the temperatures of 120 DEG C, 140 DEG C and 160DEG C; carrying out a direct-current voltage-withstand test on the aged cable, and measuring the leakage currents and the insulation resistance of the cable in air and water; carrying out judgment and statistics on the changes of the measured leakage currents and insulation resistance of the cable; analyzing the service life trend of the cable by measuring the mechanical performance of the cable;measuring the tensile strength and the breaking elongation rate of the aged cable by using a stretching instrument according to analyzed data; analyzing and arranging measured data, carrying out screening through a comprehensive comparison method, selecting the change trend with the high breaking elongation rate, and selecting and using an evaluation parameter which serves as the service life ofthe cable; and comparing the selected evaluation parameter with the national standard and the actual application, thereby judging whether the cable can continue to work continuously or not.

The invention discloses a method for recognizing a rotor crack fault of a steam turbine generator unit. The method comprises the steps that first, in the running process of the steam turbine generator unit, vibration characteristic components of a rotor in the steam turbine generator unit are measured in real time, wherein the vibration characteristic components of the rotor include the rotor vibration trend, the rotor vibration frequency spectrum and the rotor vibration phase position; second, whether a crack fault happens to the rotor of the steam turbine generator unit or not is judged according to the vibration characteristic components. Thus, early warnings about early-stage cracks of the rotor are achieved, an operation unit can be prompted to perform shutdown in time to perform flaw detection examination and handling, and the possible disastrous accident that a shaft is broken and a machine is destroyed due to continuous operation of the unit is avoided.

A multifunctional basin-type support comprises a support body, a height adjusting system and a force measuring system; the height adjusting system comprises an adjusting seal plate, a filling gasket plate and an external high-pressure filling device, wherein a sealed space is formed between the adjusting seal plate and the filling gasket plate, a filling pipe on the filling gasket plate leads to the sealed space, an inlet of the filling pipe is communicated with a height adjusting pipe interface on the outside of the base plate of the support, and a high-pressure filling device. The force measuring system comprises a pressure-bearing elastomer enclosed at the bottom of the filling pad and a fiber Bragg grating force measuring element in contact with the pressure-bearing elastomer. The outer end of the fiber Bragg grating force measuring element is connected with a detecting device by a signal line. A method for installing and measuring force and adjusting height comprises a mounting support, a measuring force, adjusting height, removing high-pressure filling device and monitoring. The multi-functional basin-type support is provided with a height adjustment system and a force measuring system, and can realize stepless height adjustment by filling the filling material. The construction is convenient, and the height adjustment method is simple and reliable. The vertical bearing capacity of the bearing can be monitored accurately, continuously and effectively by the force measuring system.

The invention relates to the technical field of hydropower station navigation structure construction and provides a ship elevator safety mechanism and a mounting method thereof. The safety mechanism comprises an upper guide frame assembly, a lower guide frame assembly, a safety threaded rod, a supporting rod assembly and a transmission assembly. An upper guide frame is arranged at the upper end of the safety threaded rod. A lower guide frame is arranged at the lower end of the safety threaded rod. The supporting rod assembly comprises a supporting rod, a thrust bearing, a pressure-bearing block and a pressure-bearing ring. A spherical hinge is arranged at the lower end of the supporting rod. The transmission assembly comprises a speed reducer, a steering bevel gear case, a clutch, a first gear, a transmission shaft and a universal coupler. The clutch is arranged between the speed reducer and the steering bevel gear case. According to the technical scheme provided by the invention, the safety mechanism is arranged on a ship elevator, and disastrous accidents can be avoided when a full-balance system of the ship elevator is damaged; and meanwhile, when the ship elevator is mounted or maintained, a ship reception chamber can be locked through the safety mechanism.

The invention discloses a method for detecting the stability and the economic property of a mining main ventilator in real time. The method comprises the following steps: 1, an air volume sensor detects the air volume of the main ventilator in real time, and a data acquisition device acquires a real-time air volume signal detected by the air volume sensor and transmits the signal to a computer in real time; 2, the computer receives the real-time air volume signal transmitted by the data acquisition device, and compares the real-time air volume signal with a main ventilator stability and economic property evaluation model when the rotating speed, pre-constructed by the computer, of the main ventilator is n minute to obtain a comprehensive stability and economic property operation state of the main ventilator. According to the method, the steps are simple, and the method is convenient to implement and low in cost; the stability and the economic property of the main ventilator are effectively combined together, so that the stable and economic operation of the main ventilator can be realized favorably, and the use effect is good.

The invention discloses a device and a method for on-line detection of high-voltage switches, which helps to monitor the performances of compression springs of the high-voltage switches under causative conditions in real time, avoids disastrous accidents induced by spring yielding, and is favorable for grading the causative compression springs during the overhaul of the high-voltage switches so asto achieve on-line control on overhaul operation. The method comprises the following steps: (1) designing the complete-energy causativity of the compression springs, and tension or stress values of damage tolerance; (2) using a force measurement or stress sensor to detect the tension or stress of the compression springs under the causative conditions in real time; (3) allowing a system to automatically alarm or isolate high-voltage power grids when the tension or stress values detected in real time is lower than the damage tolerance; and (4) using the detection device to grade the causative compression springs when the high-voltage switches are overhauled and installing the compression springs of the same grade on the high-voltage switches of one high-voltage power grid. The invention hasthe advantage of improving the operation quality of the high-voltage power grids.

The invention relates to a starter embedded output shaft assembly. The starter embedded output shaft assembly comprises an output long shaft, an output short shaft and a thin safety shaft; the axis ofthe output long shaft and the axis of the output short shaft are provided with shaft holes in the axial direction, and the thin safety shaft is arranged in the shaft holes of the output long shaft and the output short shaft; the front end of the thin safety shaft is provided with a limiting pin hole, the front end of the shaft hole formed in the output long shaft is provided with a slide groove in the axial direction so that a first limiting pin can be inserted into the limiting pin hole formed in the front end of the thin safety shaft and arranged in the axial slide groove formed in the front end of the output long shaft when the thin safety shaft is inserted into the shaft holes, and the thin safety shaft is in limiting connection with the output long shaft through the first limiting pin in the circumferential direction; and the middle of the shaft hole of the output long shaft is provided with a thrust stepped hole, the front end of the thin safety shaft is sleeved with a spring inthe compressed state, the spring is arranged between the thrust stepped hole and the first limiting pin, and the inner side of the front end of the thin safety shaft is provided with a thin safety shaft cutting section.

The invention relates to a solid anti-pricking tire and a manufacturing method thereof. The solid anti-pricking tire consists of gum filler, a tire cover, frameworks, a wheel spoke and a gum injection hole, wherein the frameworks with adequate number are distributed on the wheel spoke by taking the wheel spoke as a main body; the frameworks can be combined with the wheel spoke by means of welding, bolt connection and so on and then the tire cover is arranged; and after assembly is finished, the gum filler is injected through the gum injection hole. By utilization of the solid anti-pricking tire, tire fracture caused by road reason and so on and a series of disastrous accidents caused by the tire fracture can be avoided.

The invention discloses a self-adaptation sealing-type mechanical sealing device. A static sealing ring and a rotating sealing ring are arranged on the outer side of a rotating shaft in an axially opposite mode. The opposite axial end face of the static sealing ring and the opposite axial end face of the rotating sealing ring are sealing faces. The static sealing ring is arranged on a fixed structure through an anti-rotating structure and springs in a positioning mode, wherein the springs are arranged at intervals along the circumference of the static sealing ring. The rotating sealing ring is connected with a shaft sleeve of the rotating shaft in a transmission mode through a transmission structure. An elastic structure provided with axial elastic pushing force towards the directions of the sealing end faces is arranged between the rotating sealing ring and the shaft sleeve. Under a lower-pressure condition, the self-adaptation sealing-type mechanical sealing device a spring-static-type contact-type mechanical sealing device which is consistent with a normally-used type, and sealing with normal long service life operation under the lower-pressure condition can be effectively ensured. Under a high-pressure condition, a sealing type of the self-adaptation sealing-type mechanical sealing device can be changed along with pressures, and the self-adaptation sealing-type mechanical sealing device is automatically converted into a fluid-static-pressure-type mechanical sealing device, can bear high pressure in a better mode, ensures that the sealing is not damaged and effectively prevents disastrous accidents from happening.

The invention discloses a glass cracking automatic explosion-proof device. A conductive film with lower resistance is arranged on the surface of glass, or a thin conducting wire is embedded into the glass; the conductive film or the thin conducting wire is electrically connected with a circuit board control unit; and the circuit board control unit responds to a change signal and controls a relevant energy supply unit to cut off the supply. The glass cracking automatic explosion-proof device has the advantage that: when the glass is cracked or broken, a sensor acquires relevant information, and remedial measures are taken, so that a disaster is avoided.

The invention discloses a transmission tower damage recognition method, so as to solve the technical problem that the accuracy of recognizing the damage of a transmission tower structure by only depending on the vibration mode and the frequency of the transmission tower at present is not high, and the accuracy requirements for damage recognition of the transmission tower structure in engineering practice are hard to meet. The method comprises steps: the vibration modes before and after damages of multiple places of the transmission tower structure are acquired, and according to the vibration modes before and after damages of multiple places of the transmission tower structure, a vibration mode curvature difference before and after the damages of multiple places of the transmission tower structure is calculated; the vibration mode curvature difference before and after the damages of multiple places of the transmission tower structure is subjected to wavelet transform, a corresponding wavelet coefficient is acquired, and the information source of the vibration mode curvature difference before and after the damages of multiple places of the transmission tower structure in a wavelet domain is calculated and acquired according to the wavelet coefficient, wherein the information source are multidimensional vectors formed by change energy before and after the damages of multiple places of the transmission tower structure; and according to the information source, the damage possibilities of the multiple places of the transmission tower structure are solved respectively, and a damage recognition result of the transmission tower structure is acquired.

The invention discloses a gas burner for a pulverized coal boiler and a control method thereof. The gas burner comprises a burner, a first-level combustor and a burner control system and is characterized in that the burner comprises a combustion-supporting gas pipe, a hollow pipe, an air channel, a mixed gas pipe and a pulverized coal air pipe, wherein the hollow pipe is located in the axis direction of the burner; the air channel is communicated with the combustion-supporting gas pipe; the first-level combustor is connected with the front end of the pulverized coal air pipe; a natural gas pipe, a coal gas pipe and a gas mixing cavity are arranged at the rear end of the burner; the gas mixing cavity is connected with the natural gas pipe and the coal gas pipe; the burner control system is electrically connected with a combustion-supporting gas control device, a pulverized coal control device, a natural gas control device, a coal gas control device and a compressed air control device. The gas burner for the pulverized coal boiler has the beneficial effects of simple and reasonable structure, high and stable ignition efficiency, capability of preventing a burning wall from being lagged and eroded, zero oil, gas-saving effect and capability of efficiently avoiding disaster accidents.

The invention relates to a combined lining structure based on polyhedral duct pieces for a tunnel. The combined lining structure is formed by combining and assembling a plurality of pieces of hexahedral duct pieces, a plurality of pieces of octahedral duct pieces and a plurality of pieces of decahedral duct pieces into a cylinder shape, so that through seams do not exist in the longitudinal direction and the circumferential direction of the combined lining structure. Compared with the prior art, according to the combined lining structure, obvious weak links do not exist in the lining structure, opening and dislocation deformation among duct piece structures can be reduced, the waterproof capacity of the tunnel lining structure is improved, a complete lining stressed structure ring is formed by the decahedral duct pieces and tetrahedral duct pieces in the tunnel ring direction, a complete lining stressed structure ring is formed by the octahedral duct pieces and the tetrahedral duct pieces at the end part of the tunnel, decahedral or octahedral inclined planes are interacted among the rings to transmit loads, and when local diseases of the tunnel occur, the rings can act together toavoid catastrophic accidents.