Abstract
This study investigated the temperature field distribution of a freezing inclined shaft. Thus, a three-dimensional physical simulation test system was developed, and the system consists of six parts, which are simulation box and shaft model, loading system, freezing system, external environment simulation system, and data acquisition system. From the results of physical and mechanical property test of artificially frozen sand, in the range of 25°C to -20°C, the heat capacity of sand decreases first, then increases, decreases, and finally tends to be stable; the thermal conductivity of sand gradually increases and finally becomes stable; and the cohesion, internal friction angle, uniaxial compressive strength, and elastic modulus of artificially frozen sand all increase as the freezing temperature decreases. The three-dimensional physical simulation test and field measurement showed that the distance from the freezing pipe is the main factor affecting freezing wall temperature, and the closer to the freezing pipe, the faster the cooling rates. Comparison of theoretical calculation results and field measurement results shows that the calculation formula of freezing wall temperature with time of the inclined shaft can reflect the general law of freezing wall temperature cooling. Therefore, the 3D physical simulation test system is reliable and the test method is feasible.
Highlights
Vertical straight-line artificial freezing is often used to excavate a shaft in areas with large water content, shallow coal seam, and soft soil [1]
A three-dimensional physical simulation test system was developed to complete the test of temperature field distribution law of the artificially frozen inclined shaft
The amplitude of the increase will gradually decrease as the frozen temperature decreases, and the growth rate of uniaxial compressive strength is about 0.29~1.43 MPa/°C
Summary
Vertical straight-line artificial freezing is often used to excavate a shaft in areas with large water content, shallow coal seam, and soft soil [1]. Liu et al [34] studied the formation and development of the frozen wall under the vertical straight-line frozen condition of water-bearing sand stratum and studied the distribution law of the frozen wall temperature field in the inclined shaft. Ren et al [38] studied the mechanical properties and temperature field of the frozen wall in the water-rich sand layer by the combination of indoor physical mechanics test, field measurement, and finite element numerical simulation. He et al [39] through numerical simulation analysis and field monitoring data studied the development law of the temperature field and frozen wall during the freezing process.
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