An experimental investigation of transient heat transfer in surrounding rock mass of high geothermal roadway

Zhang, Yuan; Wan, Zhijun; Gu, Bin; Zhou, Changbing

doi:10.2298/tsci151017053z

Cited by 22 publications

(24 citation statements)

References 6 publications

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“…Currently, human beings have managed to exploit solid mineral resources at about 4 km underneath and mechanical tools can also reach strata of more than 10000 m underground [1]. The research on high geothermal properties of rock mass is a must for deep mining because of the common high temperature problem.…”

Section: Introductionmentioning

confidence: 99%

Uniaxial compressive strength and failure characteristics of arkosic sandstone after thermal treatment

Zhang

et al. 2020

THERM SCI

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Experiments were conducted to study the mechanical characteristics of arkosic sandstones sampled from Pingyi, China. Rock samples were all thermally treated under the temperature ranging from room temperature to 800 °C. Results show that as the treatment temperature rises, the arkosic mineral composition does not change obviously, but the mechanical behaviors change regularly. Variation trend changes dramatically at 200 °C, 400 °C, and 500 °C. With thermal expansion of mineral particles being the dominant factor, mechanical behaviors barely change below 200 °C. When temperature ranges from 200-400 °C, it has an important effect on the mechanical properties because of the thermal fracture. From 400-500 °C, mechanical properties change dramatically as a result of the mutual influence of thermal fracture, fusion and re-crystallization, but the thermal fracture is the leading factor. Because of the fusion and re-crystallization, fractures are partly filled, which results in partial recovering of the mechanical strength. With the combined action of thermal fracture, fusion and re-crystallization after 600 °C, mechanical performance of arkosic sandstones degrades rapidly. Generally, the porosity and peak strain of arkosic sandstones increase with the temperature rising. However, the peak stress, elastic modulus and deformation modulus decrease simultaneously. Influenced by mineral particles' thermal expansion, thermal fracture, fusion, and re-crystallization and so on, the variation trend and amplitude are not the same at different temperature ranges, and the damage mechanism of sandstones also makes a difference.

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Section: Introductionmentioning

confidence: 99%

Uniaxial compressive strength and failure characteristics of arkosic sandstone after thermal treatment

Zhang

et al. 2020

THERM SCI

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“…With the wide application of numerical calculation methods, the distribution of temperature field [10,11], the analysis of influencing factors [12,13], and the characteristics of heat and moisture exchange [14][15][16] are analyzed. In the site investigation and experimental testing, similar experimental platform for temperature field of roadway surrounding rock was established, and the unsteady state process of temperature field of roadway surrounding rock was analyzed [4,17]. The above research results explain the distribution law of surrounding rock temperature field in high temperature roadway and point out that the heat transfers from deep surrounding rock to air flow in the roadway are the key factors.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Analysis of Unsteady Temperature in Thermal Insulation Supporting Roadway

Shu-guang

Wang

2019

Mathematical Problems in Engineering

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High geothermal hazard is a basic problem that must be solved in deep mining; thereby the research on thermal insulation supporting for high temperature control of deep roadway is increasing. However, the quantitative analysis of its thermal insulation effect is yet to be carried out. By building the physical model and control equations of the thermal insulation supporting roadway and considering heat-humidity transfer at wall, the temperature field distribution of surrounding rock and airflow is numerically calculated. Based on numerical simulation results, the evolution law of temperature with ventilation time is analyzed at airflow inlet, outlet, and different sections, then the variation law of surface heat transfer coefficient with position and time is obtained. For heat insulation support structure, the results show that it is not obvious to change the distribution law of temperature field, but it is effective to weaken the convection heat transfer between surrounding rock and airflow. In the main airflow area, the rate of heat exchange gradually decreases with the heat exchange becoming more and more sufficient; in boundary layer, the airflow temperature quickly transits from the wall temperature to that of the main airflow area because of intense collisions of airflow masses, so the mechanism of temperature change is different. The surface heat transfer coefficient well reflected the unstable heat-humidity transfer, especially in the beginning of ventilation or at airflow inlet. Therefore, the heat insulation supporting structure is helpful to the auxiliary cooling of high temperature mine.

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“…1. Those issues are directly related to heat transfer and temperature distribution in solids [9,[11][12][13][14][15][16][17]. Understanding the heat transfer process can predict and prevent the damage in solids during structure service period, which is significant for the structure safety.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer on simplified pre-period stage of tunnel fire

Liu

Yao

2019

THERM SCI

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Tunnel fire is a part of applied thermal problems. With increase of transient temperature of the tunnel fire on the structure surface (i. e. tunnel lining), the heat transfer from the surface is possibly varying transient temperature distribution within the structure. The transient temperature distribution is also possibly damaging the composition of structure (micro-crack) because of critical damage temperature. Therefore, the transient temperature distribution has a significantly important role on defining mechanical and physical properties of structure and determining thermal-induced damaged region. The damage at pre-period stage of tunnel fire is perhaps more significant than that at the other period stages because of thermal gradient. Consequently, a theoretical model was developed for simplifying complicated thermal engineering during pre-period stage of tunnel fire. A hollow solid model in a combination of dimensional analysis and heat transfer theory with Bessel's function and Duhamel's theorem were employed to verify a theoretical equation for dimensionless transient temperature distribution under linear transient thermal loading. Experimental and numerical methods were also adopted to approve the results from this theoretical equation. The heating rate is a primary variable for discussing dimensionless transient temperature distribution on three means. The heating rate of 10191.10 and 240 °C/min were applied to experimental and numerical studies. The experimental and numerical results are consistent with the theoretical solution, successfully verifying that the theoretical solution can predict the dimensionless transient temperature distribution well in field. This equation can be used for thermal/tunnel engineers to evaluate the damaged region and to obtain the parameters related to dimensionless transient temperature distribution.

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An experimental investigation of transient heat transfer in surrounding rock mass of high geothermal roadway

Cited by 22 publications

References 6 publications

Uniaxial compressive strength and failure characteristics of arkosic sandstone after thermal treatment

Uniaxial compressive strength and failure characteristics of arkosic sandstone after thermal treatment

Numerical Simulation Analysis of Unsteady Temperature in Thermal Insulation Supporting Roadway

Heat transfer on simplified pre-period stage of tunnel fire

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