Abstract
The high temperature of rock used in different working conditions has a significant effect on the deformation characteristics and the mechanics of tunnel lining support structure. A test using a laboratory model is designed to study the quantitative relationship between the temperature difference and the support force. Through the laboratory model test, the strain and stress variation characteristics of the supporting structure of a water diversion tunnel under different surrounding rock temperatures and different water temperatures were simulated. The variation characteristics of the supporting structure under various working conditions, such as a different initial temperature field, different crossing water temperature of the diversion tunnel during runtime, and repairing period after the water is emptied, were analyzed. The relationship between the high-temperature difference between the inner and outer walls of the tunnel lining support structure and the internal temperature stress of the supporting structure was obtained and compared with the results from numerical experiments. The test results showed that a high circumferential tensile stress is created in the support structure of the high-temperature diversion tunnel due to the temperature difference between the inner and outer walls of the support structure caused by water going through the high-temperature diversion tunnel. The radial compressive stress increases by 45–50%, and the circumferential tensile stress increases by 40–60%. The results provide references for the design of the support structure in a high-temperature tunnel.
Highlights
Academic Editor: Flavio Stochino e high temperature of rock used in different working conditions has a significant effect on the deformation characteristics and the mechanics of tunnel lining support structure
At each value of temperature difference, the radial temperature stress is slightly less than the circumferential temperature stress
(1) When there is a high temperature difference between the inner and outer walls of a tunnel lining support structure, large temperature stress will be generated inside the tunnel lining support structure
Summary
The temperature of the lining rock was simulated by heating a customized stainless-steel mica using an electrothermal cycle. E system has the advantages of high sensitivity, low drift, and multipoint sampling It can be used for the multipoint strain test and multipoint static stress and strain caused by factors such as compressive stress, force, and temperature. Model starts to heat, the 24 strain gauges are rebalanced to zero to be able to consider the time when heating starts as the starting point of the recording of measurement data, measure the temperature strain value of the lining model during the whole test, and convert the stress value under different temperature differences.
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