Tunnel lining component high-temperature mechanical property testing system

Abstract

The invention discloses a high-temperature mechanical properties testing system of tunnel lining structure, comprising fire thermal environment simulation subsystem; heat insulation subsystem; base and lining structure mechanical border simulation subsystem; loading subsystem, measurement subsystem; data acquisition subsystem; lining structure thermal border simulation subsystem. This tested system can better simulate characteristics of the tunnel fire (quick heating-up, high maximum temperature reached) and a variety of tunnel fire scenes; can simulate the thermal border condition of tunnel lining structure system and effect of surrounding soil, groundwater to components; can simulate the effect of formation resistance force to lining structure system; can impose a variety of loads- temperature conditions to lining structure system; can impose different displacement border conditions to lining structure system. The invention is safe, reliable, easy to use, with low failure rate, can meet the requirements of mechanical performance test of tunnel lining structure at high temperature (after high temperature).

Description

technical field [0001] The invention relates to a test device, in particular to a device for performing high-temperature mechanical performance tests on tunnel lining components. Background technique [0002] For underground structures such as tunnel lining, when studying the mechanical properties of its components (segments, joints, etc.) at high temperature (after high temperature), compared with the above-ground structure, there are the following important characteristics and differences: [0003] Actual fire accidents and fire tests at home and abroad show that tunnel fires heat up quickly (up to 250°C / min), achieve high maximum temperatures (up to 1350°C), and last for a long time. In order to describe the characteristics of tunnel fires, temperature-time curves such as RWS (Netherlands), HC, and RABT (Germany) have been established internationally. Therefore, when testing the mechanical properties of tunnel lining components at high temperature (after high temperature...

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Problems solved by technology

[0008] serial number heating method temperature control method shortcoming 1 electric furnace heating Temperature Controller The heating rate is slow, about 10-20°C / min; it cannot reflect Characteristics of tunnel fires 2 Gas heating up By manually adjusting the fuel (gas, Fuel) to control the flow rate of the furnace The temperature makes it follow the predetermined temperature rise curve line change (1) There is no automatic control equipment, and it is difficult to control the temperature manually The degree increases according to the set curve (2) The maximum temperature that can be reached is low, which cannot reflect the tunnel High temperature characteristics of road fires 3 oil heating The combustion bed is welded with steel plates, according to There is a certain amount of fuel remaining on the scale of the fire (diesel+gasoline); Throttle ventilation controls combustion rate (1) It is not easy to control the temperature to rise according to the set curve; (2) It is difficult to carry out automatic control (3) not safe enough; a large amount of gas will be produced in the combustion process Heavy smoke, great environmental pollution 4 Refractory brickwork coke burning Burn test furnace (1) Combustion is controlled by the amount of coke the peak temperature in the process; (2) By adjusting the air intake to control heating rate (1) The heating rate is slow (2) It is not easy to control the temperature to rise according to the set curve

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