Plugging and Its Stability Evaluation for the Ore Pass in the Nonempty Condition Based on Controllable Grouting of Cement-Sodium Silicate Grout

Aimed at the problem to plug the main ore pass with the large collapse at Xingshan Iron Mine, the viscosity-time test and the heap perfusion test of cement-silicate grout in a loose rock mass are carried out. The relationship between the vertical diffusion distance of cement-silicate grout and setting time of grout is studied, and research results are applied to the design of plugging engineering of the main ore pass in -330 m. Based on the numerical simulation of the plugging structure and the long-term stress monitoring of the cable sensors, the stability of the plugging structure itself and the control for the movement of shafts nearby are comprehensively evaluated. The test results show that for a specific loose rock mass, the vertical diffusion distance of cement-silicate grout in the loose rock mass is a power function of grout setting time. Based on the design concept to plug the main ore pass with the large collapse using artificially constructed “bite-bonded arch,” the plugging design and construction procedures are proposed. A numerical model and long-term monitoring of cable stress show that the plugging structure is stable and has an obvious effect on the control movement of abutment shafts.

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Numerical Simulation on Deformation Features and Filling Efficiency of Channel Goaf Foundation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.353-356.3707 ◽

2013 ◽

Vol 353-356 ◽

pp. 3707-3712

Author(s):

Zhi Dong Zhou ◽

Hong Bo Zhang ◽

Xiu Guang Song ◽

Hong Ya Yue

Keyword(s):

Numerical Simulation ◽

Comparative Analysis ◽

Comprehensive Analysis ◽

Obvious Effect ◽

Before And After ◽

Check Gate ◽

Deformation Features ◽

Natural Foundation ◽

The Stability

For analyzing and evaluating the deformation features of channel goaf foundation and its effect on superstructure, according to the foundation reinforcement engineering of Ji-Liang Channel Check Gate, the comparative analysis on the differential settlement between the unfavorable foundation and natural foundation was performed by numerical simulation with FLAC3D. The computer results showed that the present foundation had obvious effect on the stability and security of the superstructure, so the engineering treatment are needed. Based on technical-economic comprehensive analysis among three treatment methods for strengthening the channel golf foundation with different kinds of filling, the reasonable method is put forward in this paper. By comparing mechanical characteristic of flashboard in channel goaf before and after strengthening, we confirmed the foundation stability of channel goaf and the security of the ground building which can satisfy the long term usage requirements.

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Study of the Three-Dimensional Global Limit Equilibrium Method Applied to the Stability of Rock Slope

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.249-250.1099 ◽

2012 ◽

Vol 249-250 ◽

pp. 1099-1102

Author(s):

Yi Sheng Huang ◽

Jian Lin Li

Keyword(s):

Rock Mass ◽

Stability Analysis ◽

Slip Surface ◽

Limit Equilibrium ◽

Limit State ◽

Three Dimensional ◽

Limit Equilibrium Method ◽

Equilibrium Method ◽

The Stability ◽

Loose Rock

Amending the normal stress over the slip surface based on the stress field by numerical analysis, applying the three-dimensional global limit equilibrium method to the stability analysis of tension-slackened rock mass in the right bank of Yagen hydropower station. Stability analysis shows that if do not take any measures, the loose rock mass stability can cater to the Specification demand, but some small sliders is in the limit state under the water and earthquake condition, if use the cutting slope and unloading scheme, the whole loose rock mass and the all small sliders can meet the Specification standard stability requirements.

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Design of underground structures and analysis of self-support capacity

Materials and Geoenvironment ◽

10.2478/rmzmag-2018-0010 ◽

2018 ◽

Vol 65 (2) ◽

pp. 59-70

Author(s):

Matej Nagy

Keyword(s):

Rock Mass ◽

Hard Rock ◽

In Situ Stress ◽

Stability Control ◽

Underground Structures ◽

Underground Powerhouse ◽

The Stability ◽

Methods Numerical

Abstract The complicated rock structures and the stability of surrounding rocks of the underground powerhouse are key ground mechanical challenges for hydropower projects. In this paper, an example of contributing self-support capacity of rock mass to evaluate optimised support for long-term usage of structure is given. It describes importance of investigations in the initial in situ stress distribution, rock mechanical and geological properties, engineering rock mass classifications by different methods, numerical modelling, comparison of tools for stability and support analysis and proper stability control for rock excavation and support. The results show that after underground excavations in hard rock, detailed analysis of measures to investigate deformation and self-supporting capacity creation is useful and a cost-saving procedure.

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Comparison Optimization Analysis of the Location of Power House under Complex Geological Structure

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.306-308.1455 ◽

2006 ◽

Vol 306-308 ◽

pp. 1455-1460

Author(s):

Jing Zeng ◽

Qian Sheng ◽

Qing Chun Zhou

Keyword(s):

Rock Mass ◽

Geological Structure ◽

Surrounding Rock ◽

Obvious Effect ◽

Power House ◽

Mass Comparison ◽

Geological Conditions ◽

Stability Of Surrounding Rock ◽

Complex Geological Structure ◽

The Stability

The power house of Yantan extended hydropower project, with complex geological conditions such as fault f211 below the power house and quartzite on top of it, is a huge underground cavern with large span and high wall. In order to evaluate the stability of the power house surrounded by such complex geological structure, the numerical simulation excavation of power house with different location schemes were studied by the elasto-plastic 2D FEM method. The deformation and evolutive process of the stress with the progress of excavation were analyzed. On the condition ensuring the whole stability of surrounding rock mass, comparison optimization analyses were conducted on the power house location scheme. The rational location scheme was demonstrated. The final analyses results show that: (1) The mechanical properties of quartzite and its relative location to the power house has no obvious influence to the stability of surrounding rock mass.(2) The f211 is the main bad geological structure which affect the stability of power house. (3) The case of moving 10m upward of power house is the most rational scheme for the whole stability of power house. (4) The Supporting measures, which would has an obvious effect in controlling the influence on the stability of surrounding rock mass by weak geological structure, are suggested at the out-crop of f211.

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The Stability of the WHO Reference Thromboplastin NIBS & C 67/40

Thrombosis and Haemostasis ◽

10.1055/s-0038-1657008 ◽

1979 ◽

Vol 42 (04) ◽

pp. 1135-1140 ◽

Cited By ~ 9

Author(s):

G I C Ingram

Keyword(s):

Human Brain ◽

Collaborative Study ◽

Calibration Constant ◽

Long Term Stability ◽

Freeze Dried ◽

Show Evidence ◽

Human Material ◽

Reference Preparation ◽

The Stability

SummaryThe International Reference Preparation of human brain thromboplastin coded 67/40 has been thought to show evidence of instability. The evidence is discussed and is not thought to be strong; but it is suggested that it would be wise to replace 67/40 with a new preparation of human brain, both for this reason and because 67/40 is in a form (like Thrombotest) in which few workers seem to use human brain. A �plain� preparation would be more appropriate; and a freeze-dried sample of BCT is recommended as the successor preparation. The opportunity should be taken also to replace the corresponding ox and rabbit preparations. In the collaborative study which would be required it would then be desirable to test in parallel the three old and the three new preparations. The relative sensitivities of the old preparations could be compared with those found in earlier studies to obtain further evidence on the stability of 67/40; if stability were confirmed, the new preparations should be calibrated against it, but if not, the new human material should receive a calibration constant of 1.0 and the new ox and rabbit materials calibrated against that.The types of evidence available for monitoring the long-term stability of a thromboplastin are discussed.

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ESTIMATION PROCEDURE FOR THE EFFECT OF TRIGGERING FACTORS ON TECHNICAL CONDITION OF LONG-TERM OPERATED UNDERGROUND STRUCTURES IN ROCK MASS

Физико-технические проблемы разработки полезных ископаемых ◽

10.15372/ftprpi20180501 ◽

2018 ◽

Keyword(s):

Rock Mass ◽

Estimation Procedure ◽

Technical Condition ◽

Underground Structures ◽

Triggering Factors

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Application of the method of mathematical modeling for forecasting channel deformations at the underwater crossing of the main pipeline

SCIENCE & TECHNOLOGIES OIL AND OIL PRODUCTS PIPELINE TRANSPORTATION ◽

10.28999/2541-9595-2020-10-6-599-609 ◽

2020 ◽

Vol 10 (6) ◽

pp. 599-609

Author(s):

Valery А. Gruzdev ◽

◽

Georgy V. Mosolov ◽

Ekaterina A. Sabayda ◽

◽

...

Keyword(s):

Mathematical Modeling ◽

Mathematical Model ◽

Roughness Coefficient ◽

Computational Domain ◽

Channel Deformations ◽

Geological Surveys ◽

Kuban River ◽

The Stability ◽

Protective Structures

In order to determine the possibility of using the method of mathematical modeling for making long-term forecasts of channel deformations of trunk line underwater crossing (TLUC) through water obstacles, a methodology for performing and analyzing the results of mathematical modeling of channel deformations in the TLUC zone across the Kuban River is considered. Within the framework of the work, the following tasks were solved: 1) the format and composition of the initial data necessary for mathematical modeling were determined; 2) the procedure for assigning the boundaries of the computational domain of the model was considered, the computational domain was broken down into the computational grid, the zoning of the computational domain was performed by the value of the roughness coefficient; 3) the analysis of the results of modeling the water flow was carried out without taking the bottom deformations into account, as well as modeling the bottom deformations, the specifics of the verification and calibration calculations were determined to build a reliable mathematical model; 4) considered the possibility of using the method of mathematical modeling to check the stability of the bottom in the area of TLUC in the presence of man-made dumping or protective structure. It has been established that modeling the flow hydraulics and structure of currents, making short-term forecasts of local high-altitude reshaping of the bottom, determining the tendencies of erosion and accumulation of sediments upstream and downstream of protective structures are applicable for predicting channel deformations in the zone of the TLUC. In all these cases, it is mandatory to have materials from engineering-hydro-meteorological and engineering-geological surveys in an amount sufficient to compile a reliable mathematical model.

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Influence of internal and external risks on sustainability of financial system of Аltai krai

Voprosy regionalnoj ekonomiki ◽

10.21499/2078-4023-2018--4-133-136 ◽

2018 ◽

Vol 35 (4) ◽

pp. 133-136

Author(s):

R. N. Ibragimov

Keyword(s):

Sustainable Development ◽

Financial Stability ◽

Management Strategy ◽

Financial System ◽

Risk Management Strategy ◽

The Sustainable Development ◽

The Stability ◽

The Impact

The article examines the impact of internal and external risks on the stability of the financial system of the Altai Territory. Classification of internal and external risks of decline, affecting the sustainable development of the financial system, is presented. A risk management strategy is proposed that will allow monitoring of risks, thereby these measures will help reduce the loss of financial stability and ensure the long-term development of the economy of the region.

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In Situ Tests on Creep Behavior of Rock Mass with Joint or Shearing Zone in Foundation of Large-Scale Hydroelectric Projects

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.261-263.1097 ◽

2004 ◽

Vol 261-263 ◽

pp. 1097-1102 ◽

Cited By ~ 2

Author(s):

Jian Liu ◽

Xia Ting Feng ◽

Xiu Li Ding ◽

Huo Ming Zhou

Keyword(s):

Rock Mass ◽

Creep Behavior ◽

Large Scale ◽

Time Dependent ◽

Three Gorges Project ◽

Three Gorges ◽

The Three Gorges ◽

The Three Gorges Project

The time-dependent behavior of rock mass, which is generally governed by joints and shearing zones, is of great significance for engineering design and prediction of long-term deformation and stability. In situ creep test is a more effective method than laboratory test in characterizing the creep behavior of rock mass with joint or shearing zone due to the complexity of field conditions. A series of in situ creep tests on granite with joint at the shiplock area of the Three-Gorges Project and basalt with shearing zone at the right abutment of the Xiluodu Project were performed in this study. Based on the test results, the stress-displacement-time responses of the joints and basalt are analyzed, and their time-dependent constitutive model and model coefficients are given, which is crucial for the design to prevent the creep deformations of rock masses from causing the failure of the operation of the shiplock gate at the Three-Gorges Project and long-term stability of the Xiluodu arc dam.

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