Boulby mine shaft lining design—second restoration

2002 ◽  
Vol 111 (1) ◽  
pp. 13-27
Author(s):  
A. Williams ◽  
F. A. Auld
Keyword(s):  
Mine Shaft ◽  
Shaft Lining

Research on the Application of Compound Admixture in the Freezing Mine Shaft Lining Concrete

2011 ◽  
Vol 250-253 ◽  
pp. 1252-1255
Author(s):  
Xiang Zong
Keyword(s):  
Experimental Design ◽  
Orthogonal Experimental Design ◽  
Mine Shaft ◽  
Mix Proportion ◽  
Shaft Lining ◽  
Early Strength

In order to achieve the setting and hardening of mine shaft lining concrete under the minus temperature in freezing construction and to meet the demands of every performance of concrete, the technique of compounding air entraining admixture and antifreezing admixture and early strength water reducing admixture was applied in this research. Based on the orthogonal experimental design, several mix proportions of compound admixture for early strength liquid mine shaft lining concrete were developed in the laboratory. The data collected in this research provide reference for the optimum mix proportion of the adulteration quantity of the concrete admixture. The results show that the 2.1％ amount of compound antifreezing admixture achieves favorable effects of liquid, early strength, freezing prevention and antifreezing.

scholarly journals An Experimental Evaluation of the Weathering Effects on Mine Shaft Lining Materials

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
W. Yang ◽  
A. M. Marshall ◽  
D. Wanatowski ◽  
L. R. Stace
Keyword(s):  
Mechanical Properties ◽  
Mine Water ◽  
Water Solution ◽  
Material Strength ◽  
Mine Shaft ◽  
Acidic Mine Water ◽  
Shaft Lining ◽  
Strength And Stiffness ◽  
Weathering Process ◽  
Weathering Effects

Many shaft collapses are related to the deterioration and failure of the masonry shaft lining materials. In modern mine shaft, concrete is widely used to provide support. To analyse shafts stability, the properties of the lining need to be well defined. The behaviour of masonry and concrete can be considerably affected by long-term exposure to harsh mine water. This paper presents a study which focuses on the weathering effects of mine water on lining materials (brick, mortar, and concrete). To reproduce the weathering process, samples were placed into solutions of potable water, artificial mine water, and a more aggressive mine-water solution for just less than one year. Four phases of laboratory tests were conducted throughout the time period to assess the degradation of mechanical properties of the lining materials. Particular attention is given to the degradation of material strength and stiffness. Results indicate that the harsh acidic mine water has pronounced detrimental effects on the strength and stiffness of mortar. The weathering process is shown to have the most significant effect on the stiffness of concrete and mortar. It is also shown that the use of mass loss as an index for evaluation of mechanical properties may not be appropriate.

Geomechanical aspects of formation of natural stresses in a concrete mount of a shaft shaft

2020 ◽  
pp. 199-207
Author(s):  
S. V. Sentyabov
Keyword(s):  
Rock Mass ◽  
Analytical Methods ◽  
Structural Parameters ◽  
Strength Properties ◽  
Mine Shaft ◽  
The Earth ◽  
Shaft Lining ◽  
Time Variables ◽  
Average Size ◽  
Structural Blocks

In the presented studies, the laws of the formation of natural stresses in the rock mass are confirmed, which are the sum of gravitational, static tectonic and variable components that have a variable value as a result of uniform periodic volume expansion and contraction of the Earth. The problem of trunk stability is due to the need to solve problems to determine the level of stress-strain state and strength properties in concrete supports. The stress parameters in the lining of the shafts and the monitoring of their changes are determined using a new method for measuring unloading strains. When comparing the stresses obtained experimentally by analytical methods in the concrete support of mine shafts from 2013 to 2019 at experimental test sites in the support having the lengths of bases of 1600 and 70 mm, provided that the number of geoblock ranks at this base is two, a connection with the results of measurements in an array of rocks based on 50 m with an average size of structural blocks of 0.5 m and an investment coefficient of l = 5, which corresponds to three ranks of geoblocks. In practice, it is proposed to use the main identified provisions, namely: the stress state of the mine shaft lining, which is formed as a function of their structural parameters, the full tensor of gravitational tectonic stresses acting in the rock mass at the time of the start of research and time variables, which are determined by natural and analytical methods.

Study on Rupture Curing and Monitoring of Shaft Lining in the Special Stratum

2012 ◽  
Vol 490-495 ◽  
pp. 3685-3689
Author(s):  
Peng Li He ◽  
Li Guo
Keyword(s):  
Integrated Management ◽  
Reference Value ◽  
Automatic Monitoring ◽  
Concrete Lining ◽  
Mine Shaft ◽  
Automatic Monitoring System ◽  
Strain Monitoring ◽  
Shaft Lining ◽  
Thick Overburden ◽  
Monitoring Information

The technology for curing rapture and strain monitoring of coal mine shaft in special stratum is discussed in this paper. The mine shaft lining in the deep and thick overburden is put a vertical additional, which is caused by the draining consolidation settlement of bottom aquifer. When the force together with others forces is more than the ultimate strength of concrete lining, the shaft lining will be lead to fracture. In order to treat the broken shaft lining, the integrated management method of dense shaft circles, the grouting, and loop relieving-pressure grooves was taken. The monitoring information of the remote shaft lining strain automatic monitoring system can be used to predict and evaluate the safety state of the shaft lining. The suggested mechanism and technology are able to prevent and cure shaft lining rapture in other similar mine. The treatment attained to the ideal effect and the method has an important reference value for the prevention and curing of shaft lining rupture in the same strata.

scholarly journals COMPREHENSIVE ANALYSIS OF THE SHAFT STRUCTURE OF THE DNIPRO METRO

2021 ◽  
pp. 91-98
Author(s):  
O. L. TIUTKIN ◽  
V. А. MIROSHNYK ◽  
I. V. HELETIUK
Keyword(s):  
Numerical Analysis ◽  
Strain State ◽  
Complex Analysis ◽  
Comprehensive Analysis ◽  
Design Solution ◽  
Mine Shaft ◽  
Stress Strain ◽  
Stress Strain State ◽  
Deformed State ◽  
Shaft Lining

Purpose. The construction of the Dnipro Metro, which today is characterized by high efficiency and widespread introduction of new technologies, has proved the need for predesign, design and construction work. The purpose of the scientific article is to identify during the complex analysis of the structure of the mine shaft its stress-strain state, which was obtained during the numerical analysis and geodetic monitoring. Methodology. During the complex analysis of the shaft № 16-bis of the Dnipro Metro, prognostic calculations of the stress-strain state were performed. To do this, a finite-element model is built, in which fully reflects the geometric features of the shaft, the load on it and boundary conditions. Part of the comprehensive analysis is geodetic monitoring, which is carried out during the construction of the shaft and during its operation. The works included the measurement of deformations both in the lining of the shafts and in the sections of the mine workings, as well as on the surface near the houses along the route in the area of influence of the working workings. Findings. During the numerical analysis of the structure of the shaft № 16-bis of the Dnipro Metro, displacement and force factors (normal forces and bending moments) were determined. Based on these results, the reinforcement of the elements of the shaft lining (bored pile, cap beam, reinforced concrete ring beam) was selected. The value of the deformed state obtained from the prognostic analysis indicates on the insignificant displacements of the designed structure. During the geodetic monitoring, horizontal and vertical deformations of the № 16-bis shaft lining were recorded, which were caused by the influence of public transport and heavy vehicles. But the values of these deformations reached 1 … 2 mm, which for their effect on buildings and structures is within normal limits. Originality. A comparison of the deformed state obtained during numerical analysis and geodetic monitoring, which proved the high accuracy of the prognostic calculation. Practical value. The results of a comprehensive analysis of the mine shaft of the Dnipro Metro made it possible to carry out a test the design solution and ensure high strength and stability of the lining made of bored piles.

scholarly journals Features of the thermal regime formation in the downcast shafts in the cold period of the year

2021 ◽  
Vol 250 ◽  
pp. 562-568
Author(s):  
Artem Zaitsev ◽  
Mikhail Semin ◽  
Oleg Parshakov
Keyword(s):  
Thermal Regime ◽  
Air Flow ◽  
Underground Water ◽  
Cold Period ◽  
Mine Shaft ◽  
Heat And Mass Exchange ◽  
Transfer Factors ◽  
Water Flows ◽  
Underground Mine Workings ◽  
Shaft Lining

In the cold period of the year, to ensure the required thermal regime in underground mine workings, the air supplied to the mine is heated using air handling systems. In future, the thermodynamic state of the prepared air flow when it is lowered along the mine shaft changes due to the influence of a number of factors. At the same time, the processes of heat and mass exchange between the incoming air and its environment are of particular interest. These processes directly depend on the initial parameters of the heated air, the downcast shaft depth and the presence of water flows into the mine shaft. Based on the obtained experimental data and theoretical studies, the analysis of the influence of various heat and mass transfer factors on the formation of microclimatic parameters of air in the downcast shafts of the Norilsk industrial district mines is carried out. It is shown that in the presence of external water flows from the flooded rocks behind the shaft lining, the microclimatic parameters of the air in the shaft are determined by the heat transfer from the incoming air flow to the underground water flowing down the downcast shaft lining. The research results made it possible to describe and explain the effect of lowering the air temperature entering the underground workings of deep mines

On Damage and Fracture Mechanics of Shaft Lining under Complicated Loads with Freezing Method

2010 ◽  
Vol 452-453 ◽  
pp. 549-552
Author(s):  
Bin Liu ◽  
Quan Sheng Liu
Keyword(s):  
Fracture Mechanics ◽  
Damage Model ◽  
Evolutionary Process ◽  
Additional Stress ◽  
Anisotropic Damage ◽  
Mine Shaft ◽  
Aggregate Gradation ◽  
Damage And Fracture ◽  
Shaft Lining ◽  
Set Up

Based on the stress characteristics of freeze shinking shaft lining at construction and operation stages, it is set up that The anisotropic damage model including initial damage, which suit to make Damage and Fracture Mechanics analysis for the shaft lining. A 3 dimensional anisotropic damage program is compiled using FEPG software, which take the following factors into consideration: temperature, conduction conditions, concrete facture energy and its aggregate gradation. Take the liangbosi mine shaft lining for example, its damage evolutionary process under complicated stresses such as permanence field stress, the gravity and vertical additional stress changed with time is obtained. It is discussed that the facture’s position and its development process, and the mechanical mechanics of the shaft lining structure failure.

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