Numerical simulation and measurement analysis of the temperature field of artificial freezing shaft sinking in Cretaceous strata

Yao, Zhishu; Cai, Haibing; Xue, Weipei; Wang, Xiaojian; Wang, Zongjin

doi:10.1063/1.5085806

Cited by 13 publications

(13 citation statements)

References 12 publications

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“…For simplicity, it was assumed that the soil had a sharp phase boundary γ separating the frozen and unfrozen zones. In this case, the heat balance equation for some small section of such a boundary is described as follows: Formula (11) is the boundary condition at the phase transition front in the classic one-dimensional formulation of the Stefan problem [23]. The first summand on the left (11) characterizes the heat outflow to the freezing pipe, and the second one characterizes the heat inflow from the unfrozen soil.…”

Section: Theoretical Interpretationmentioning

confidence: 99%

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Features of Adjusting the Frozen Soil Properties Using Borehole Temperature Measurements

Семин

Levin

Bogomyagkov

et al. 2021

Modelling and Simulation in Engineering

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The paper examines the theoretical issues of using borehole temperature survey data to control a frozen wall formed around the sinking mine shafts of the Nezhinsk mining and processing plant potash mine. We consider adjusting the parameters of the mathematical model of the frozen soil based on temperature measurements in boreholes. Adjustment of the parameters of the mathematical model (thermophysical properties of the soil) is usually carried out by minimizing the discrepancy functional between the experimentally measured and model temperatures in the temperature control boreholes. An important question about the form of this functional and the existence of minima remained after the previous studies. The study aimed at this question included analysis of heat transfer in two horizontal layers (sand and chalk) for two shafts under construction using artificial ground freezing. It was shown that the discrepancy functional minimum under certain conditions moves over time or is nonunique. This phenomenon results in ambiguity in adjusting the mathematical model parameters in the frozen soil to fit the borehole temperature survey data. At the stage of the frozen wall growth, the effective thermal conductivity in the frozen zone can be determined ambiguously from the temperature measurements in the boreholes—its value can change over time. At the stage of maintaining the frozen wall, the solution turns out to be dependent on the ratio of effective thermal conductivities in the frozen and unfrozen zones.

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Section: Theoretical Interpretationmentioning

confidence: 99%

“…Conducting temperature surveys in temperature control (TC) boreholes is currently the main and most informative method of analyzing the actual FW properties. This experimental method is used for the con-struction of mine shafts and underground tunnels, both in Russia [5][6][7] and in other countries [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Features of Adjusting the Frozen Soil Properties Using Borehole Temperature Measurements

Семин

Levin

Bogomyagkov

et al. 2021

Modelling and Simulation in Engineering

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“…Jarosław et al [10] study deep excavation and tunnelling works in city of old town centres, where the technical condition and structural stiffness of historical buildings is rather doubtful. Zhishu et al [11] study used the Hongqinghe air shaft freezing project as an example to perform a numerical simulation and measurement analysis of the temperature field of shaft sinking via the artificial freezing method in Cretaceous strata. In addition, Qixiang et al [12] study the coupled method of the field monitoring, the analytical formula, and the numerical method is used to evaluate the thickness and average temperature of the frozen zone field monitoring was conducted to measure the temperature of the brine and the ground.…”

Section: Introductionmentioning

confidence: 99%

Modelling and Stress Analysis of Shaft Work Subsidence of Underground Power Transmission Line Tunnel

Thamawong

Raongjant

2022

Trends Sci

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This research presents an analysis of soil subsidence around shaft work under its construction process and drilling tunnel by finite element method (FEM). The study is focused on the underground power transmission tunnel in the Chao Phraya River construction project (Southern Bangkok Station to Suksawat Road, Thailand) of the Metropolitan Electricity Authority. This research aims to provide information for designing shaft work and preventing drilling tunnel problems. The research analyzed the soil subsidence around shaft work with 12 m of inside diameter and 1 m of thickness that located 33 m underground during constructing a tunnel chimney by sinking method. It is assumed that the analyzed horizontal reaction is the net resistance of the lateral earth pressure around the shaft work. This study found that the subsidence of soil around shaft work during the construction and drilling process had the value between 0.80 - 53.30 mm. In the part of the base slab, the soil subsidence value is between 3.40 - 16.00 mm. It can be concluded that the top of shaft work during the construction and drilling process had a soil subsidence value of 53.30 mm with dmax/H ratio of 0.00162. HIGHLIGHTS The Metropolitan Electricity Authority has an underground power transmission tunnel in the Chao Phraya River Construction (Southern Bangkok Station to Suksawat Road, Thailand) project which used to distribute electricity from the source station to the other side of the Chao Phraya River This research studied the behavior of the shaft work in sinking reinforced concrete shaft work and drilling tunnel process by finite element method (FEM) with the Midas Gen 2021 program The analysis results of the maximum soil subsidence around the shaft work wall occurred in the top area (very soft to medium stiff clay layer) GRAPHICAL ABSTRACT

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“…The artificial freezing method is a reliable method for shaft sinking when the shaft passes through the water-rich soft stratum [1,2]. By embedding the freezing pipe in the water-rich unstable soil layer [3], the artificial freezing method can freeze the natural soil into artificial frozen soil, so as to increase its strength and stability [4]. This ensures the normal progress of the drilling and construction through the protection of the freezing wall (FW) [5].…”

Section: Introductionmentioning

confidence: 99%

Study on Temperature Field Evolution and Frozen Wall Closure Judgment Criteria of Inclined Shaft under Inclined Holes Freezing Condition

Zhang

Yang

et al. 2022

Geofluids

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A similarity experiment study is conducted to investigate the evolution characteristics of temperature field and frozen wall closure judgment criteria for the inclined shaft, under inclined holes freezing condition using an adjustable-angle freeze sinking analogous instrument. The changes of temperature and frozen wall thickness with the freezing time in the inclined shaft section, are recorded in real time, and the water pressure of axial and radial hydrological holes are measured. The results demonstrate that the soil temperature change can be divided into three stages under the conditions of salt-water temperature of -32°C and flow rate of 3.18 m/s: rapid cooling before reaching the freezing point, slow cooling in the process of freezing latent heat release, and accelerated cooling and stabilization after freezing latent heat release. The distance from the freezing pipe is the main factor affecting the freezing wall temperature. Affected by the arched arrangement of frozen pipes, the freezing speed in the position of arch crown and arch baseline is slower than the position of wall corner and base plate. A new judgment criterion of frozen wall closure based on the water pressure of the axial hydrological pipe is recommended. In all, this paper has an enlightenment significance for understanding the evolution of the soil temperature field, and predicting the frozen wall closure time in applications of the inclined holes freezing method for the inclined shaft.

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Numerical simulation and measurement analysis of the temperature field of artificial freezing shaft sinking in Cretaceous strata

Cited by 13 publications

References 12 publications

Features of Adjusting the Frozen Soil Properties Using Borehole Temperature Measurements

Features of Adjusting the Frozen Soil Properties Using Borehole Temperature Measurements

Modelling and Stress Analysis of Shaft Work Subsidence of Underground Power Transmission Line Tunnel

Study on Temperature Field Evolution and Frozen Wall Closure Judgment Criteria of Inclined Shaft under Inclined Holes Freezing Condition

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