Numerical Study on Thermal Damage Behavior and Heat Insulation Protection in a High-Temperature Tunnel

Kang, Fangchao; Li, Yingchun; Tang, Chun’an; Li, Tianjiao; Wang, Kaikai

doi:10.3390/app11157010

Cited by 6 publications

(4 citation statements)

References 46 publications

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“…Its theoretical basis and software architecture were initially proposed by Professor Tang's team and further developed by Mechsoft. RFPA2D-Thermal has been successfully applied to the study of the temperature effects of rock and concrete [30,31].…”

Section: Foundations Of Rfpa 2d -Thermalmentioning

confidence: 99%

A Study on the Freeze–Thaw Damage and Deterioration Mechanism of Slope Rock Mass Based on Model Testing and Numerical Simulation

Zhu

Wang

et al. 2022

Applied Sciences

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Engineering rock mass in cold regions has obvious freeze–thaw damage as a result of extreme differences in temperature, rainfall, snow, and other factors, which is one of the main causes of frequent geological disasters. Therefore, it is important to investigate the deterioration mechanism and evolution laws of rock mass freeze–thaw damage. Considering a hydropower station’s left bank slope in a cold region, model testing and numerical testing of slope rock mass failure under freeze–thaw conditions are here carried out by developing a generalized model. The results reveal that heat is transmitted from the outside to the inside of the slope and that the rate of temperature change varies with depth; the frost-heave force causes tensile cracks in the rock mass, with crack propagation taking the form of a circular arc; the presence of an original structural plane influences the propagation direction of the frost-heave crack, whereas the freezing rate of the fissure water influences the amplitude and growth rate of the frost-heave force. Additionally, a novel method of measuring frost-heave force is proposed. The largest frost-heave force caused by water–ice phase change is 19.3 kPa, which is equivalent to 3.17 MPa of the actual slope.

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Section: Foundations Of Rfpa 2d -Thermalmentioning

confidence: 99%

A Study on the Freeze–Thaw Damage and Deterioration Mechanism of Slope Rock Mass Based on Model Testing and Numerical Simulation

Zhu

Wang

et al. 2022

Applied Sciences

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“…Tunnel construction faces many problems regarding high-ground-temperature tunnels [1][2][3][4], as they can deteriorate the construction operating environment and lead to a significant increase in operating costs [5][6][7]. Curtain grouting technology is one of the important methods to achieve temperature control in high-ground-temperature tunnels [8]. In response to the temperature control problems of high geothermal tunnels, some scholars [9] have explored methods of solving the problems of high geothermal environments at the technical level, but these methods have insufficient economic benefits and limited application conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on the Performance Characteristics of Grouting Slurry in a High-Ground-Temperature Environment

Yang,

Niu,

Sun

et al. 2023

Buildings

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Grouting materials with good thermal insulation and reinforcement properties are the key factors in solving the temperature control problems of high geothermal tunnels using curtain grouting, as the existing grouting materials are unable to take into account the working performance and thermal insulation properties of high-temperature environments. In view of the above problems, this paper configures a high geothermal tunnel red-mud-based grouting material (RMGS) using red mud, carries out tests on the working performance (viscosity, setting time, and compressive strength) and thermal insulation performance (thermal conductivity and specific heat capacity) of the grouting materials at different temperatures (20, 40, 60, and 80 °C), and analyses the variation rules and micro-mechanisms of the various properties at different temperatures. The results show that the increase in temperature will accelerate the viscosity development and condensation of the grouting material and will also lead to the acceleration of the attenuation of the thermal conductivity of the three types of grouting material and the reduction in specific heat capacity. In addition, the appropriate temperature can improve the compressive strength of the material. The increase in temperature will accelerate the hydration reaction speed of the grouting material and will also lead to the development of the internal pore space of the material, which affects the macroscopic properties of the material and is the reason for the effect of the temperature on the performance of the grouting material. In terms of application, the cement slurry is suitable for grouting in a static water environment, the cement–water glass bi-liquid slurry is suitable for grouting in a dynamic water environment, and the RMGS is suitable for grouting in a high-ground-temperature environment.

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“…The complex geological environment and elevated ground temperatures present substantial technical challenges for engineering construction [6,7]. High ground temperatures can induce thermal stress in tunnels, potentially damaging the lining and causing incomplete hydration of concrete, thereby reducing its strength [8,9]. Furthermore, elevated ground temperatures can alter the rock's microstructure and increase its porosity, leading to changes in its physical and mechanical properties [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Fully Grouted Rock Bolts in Hydraulic Tunnels Subjected to Elevated Ground Temperatures

Jiang

et al. 2023

Buildings

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In this study, the mechanical behavior of fully grouted rock bolts in hydraulic tunnels subjected to elevated ground temperatures was investigated. A differential equation for axial displacement of the rock bolt was formulated, which considers the force equilibrium of infinitesimal bolt segments and the stress transfer mechanism at the anchor–rock interface. The distribution functions for axial stress within the bolt and the interfacial shear stress were obtained by solving the differential equation, which incorporated the displacement of the surrounding rock mass as a parameter. This study showed that the effectiveness of the bolt–shotcrete support system decreases over time, considering the displacement relaxation rate of the surrounding rock mass. The mechanical model’s variation laws at 20 °C, 50 °C, and 80 °C were summarized by integrating the thermal deformation equation for material parameters, and the numerical simulation results were compared and analyzed. The findings revealed that the bond strength between the rock bolt and the rock mass diminishes as the temperature of the surrounding rock increases, leading to a reduction of interfacial shear stress at both extremities of the bolt. Moreover, the maximum axial force within the bolt escalates as the neutral point migrates farther from the tunnel wall.

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Numerical Study on Thermal Damage Behavior and Heat Insulation Protection in a High-Temperature Tunnel

Cited by 6 publications

References 46 publications

A Study on the Freeze–Thaw Damage and Deterioration Mechanism of Slope Rock Mass Based on Model Testing and Numerical Simulation

A Study on the Freeze–Thaw Damage and Deterioration Mechanism of Slope Rock Mass Based on Model Testing and Numerical Simulation

Experimental Research on the Performance Characteristics of Grouting Slurry in a High-Ground-Temperature Environment

Mechanical Behavior of Fully Grouted Rock Bolts in Hydraulic Tunnels Subjected to Elevated Ground Temperatures

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