Mechanism of water inrush driven by grouting and control measures—a case study of Chensilou mine, China

2017 ◽  
Vol 10 (21) ◽  
Author(s):  
Hao Li ◽  
Haibo Bai ◽  
Jianjun Wu ◽  
Changshen Wang ◽  
Zhanguo Ma ◽  
...  
Keyword(s):  
Water Inrush ◽  
Control Measures ◽  
And Control

scholarly journals An Index of Aquiclude Destabilization for Mining-Induced Roof Water Inrush Forecasting: A Case Study

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 2170 ◽  
Author(s):  
Gangwei Fan ◽  
Shizhong Zhang ◽  
Dongsheng Zhang ◽  
Chengguo Zhang ◽  
Mingwei Chen ◽  
...  
Keyword(s):  
Water Level ◽  
Coal Mine ◽  
Critical Role ◽  
Water Inrush ◽  
Threshold Value ◽  
Control Measures ◽  
Assessment Index ◽  
Risk Levels ◽  
Upper Aquifer

Aquiclude plays a critical role in the occurrence of mining-induced roof water inrush in underground coal mines. This paper proposes an assessment index for the evaluation of aquiclude stability and a threshold value of water inrush from the roof, based on a case study of roof water inrush accidents in Cuimu coal mine, China. The relation between roof water inrush and water level variation in the aquifer, and the characteristics of aquiclude deformation, were studied in this assessment. Using the developed assessment criteria, the likelihood of roof water inrush was categorized into different risk levels, which were followed by a proposal for roof water inrush control measures. The main findings of this study are: a) in Cuimu coal mine, the waterbody in the bed separation between the upper aquifer and the aquiclude directly causes the inrush, and inrush occurs after the water level declines in the aquifer; b) tension-induced horizontal strains of aquiclude can be regarded as the index to evaluate the stability of aquiclude affected by underground coal mining—roof water inrush occurs when the maximum horizontal strain reaches a threshold of 10mm/m—c) based on the critical mining height for aquiclude instability, and the different thicknesses of barrier layers, high-risk zones are identified and inrush controls are proposed.

scholarly journals An Approach to Dynamic Disaster Prevention in Strong Rock Burst Coal Seam under Multi-Aquifers: A Case Study of Tingnan Coal Mine

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7287
Author(s):  
Xinxin Zhou ◽  
Zhenhua Ouyang ◽  
Ranran Zhou ◽  
Zhenxing Ji ◽  
Haiyang Yi ◽  
...  
Keyword(s):  
Rock Burst ◽  
Coal Mine ◽  
Water Inrush ◽  
Coal Seams ◽  
High Position ◽  
Integrated Method ◽  
Working Face ◽  
Strong Rock ◽  
And Control

In order to prevent the multi-dynamic disasters induced by rock burst and roof water inrush in strong rock burst coal seams under multi-aquifers, such as is the case with the 207 working face in the Tingnan coal mine considered in this study, the exhibited characteristics of two types of dynamic disasters, namely rock burst and water inrush, were analyzed. Based on the lithology and predicted caving height of the roof, the contradiction between rock burst and water inrush was analyzed. In light of these analyses, an integrated method, roof pre-splitting at a high position and shattering at a low position, was proposed. According to the results of numerical modelling, pre-crack blasting at higher rock layers enables a cantilever roof cave in time, thereby reducing the risk of rock burst, and pre-crack blasting at underlying rock layers helps increase the crushing degree of the rock, which is beneficial for decreasing the caving height of rock layers above goaf, thereby preventing the occurrence of water inrush. Finally, the proposed method was applied in an engineering case, and the effectiveness of this method for prevention and control of multi-dynamics disasters was evaluated by field observations of the caving height of rock layers and micro-seismic monitoring. As a result, the proposed method works well integrally to prevent and control rock burst and water inrush.

Effects of Alcohol Policy on Population Variables and Control Measures

2019 ◽  
pp. 179-189
Author(s):  
R. W. Kisusu ◽  
N. Kalimang'asi ◽  
N. Macha ◽  
J. L. Mzungu
Keyword(s):  
Sample Size ◽  
Alcohol Policy ◽  
Control Measures ◽  
Primary Data ◽  
Statistical Tools ◽  
Chi Square ◽  
Municipal Council ◽  
The Masses ◽  
And Control

This case study of Dodoma Municipal Council focuses on the application of statistical tools to establish Population Variables (PVs) affected by alcohol and suggested control measures. The establishment relied on primary data involving a sample size of 156 respondents selected through purposive sampling and analyzed by cross-tabs and Chi-square. The analysis found alcohol policy affects mostly the lower-educated population, small householders and youths, and these were significant at 0.029, 0.002, and 0.006 levels, respectively. The inferences drawn shows within PVs, alcohol reduces students' performances, influences separation of families, and increases poverty in the households, and all were significant at 0.003, 0.028, and 0.003, respectively. The findings conclude that alcohol affects all PVs, which consequently ends up deteriorating welfare. Therefore, to combat alcohol, the chapter recommends usage policy legal measures and educating the masses on the effect of alcohol.

Effects of Alcohol Policy on Population Variables and Control Measures

2014 ◽  
pp. 267-280
Author(s):  
R. W. Kisusu ◽  
N. Kalimangʼasi ◽  
N. Macha ◽  
J. L. Mzungu
Keyword(s):  
Sample Size ◽  
Alcohol Policy ◽  
Control Measures ◽  
Primary Data ◽  
Statistical Tools ◽  
Chi Square ◽  
Municipal Council ◽  
The Masses ◽  
And Control

This case study of Dodoma Municipal Council focuses on the application of statistical tools to establish Population Variables (PVs) affected by alcohol and suggested control measures. The establishment relied on primary data involving a sample size of 156 respondents selected through purposive sampling and analyzed by cross-tabs and Chi-square. The analysis found alcohol policy affects mostly the lower-educated population, small householders and youths, and these were significant at 0.029, 0.002, and 0.006 levels, respectively. The inferences drawn shows within PVs, alcohol reduces students’ performances, influences separation of families, and increases poverty in the households, and all were significant at 0.003, 0.028, and 0.003, respectively. The findings conclude that alcohol affects all PVs, which consequently ends up deteriorating welfare. Therefore, to combat alcohol, the chapter recommends usage policy legal measures and educating the masses on the effect of alcohol.

scholarly journals Assessing Tourists’ Preferences of Negative Externalities of Environmental Management Programs: A Case Study on Invasive Species in Shei-Pa National Park, Taiwan

2019 ◽  
Vol 11 (10) ◽  
pp. 2953 ◽  
Author(s):  
Tzu-Ming Liu ◽  
Chia-Mei Tien
Keyword(s):  
Prevention And Control ◽  
National Park ◽  
Public Support ◽  
Control Measures ◽  
Discrete Choice Experiments ◽  
Negative Externalities ◽  
The Public ◽  
Prevention And Control Measures ◽  
And Control

This study uses discrete choice experiments to evaluate and reduce the environmental impact of negative externalities of managing invasive alien species (IAS), such as “ecological shock”, “health risk”, “waiting time” “tour range” and “prevention and control fee”, on the support of IAS prevention and control. We used data from Taiwan’s Shei-Pa National Park and its visitors for the case study and obtained 602 valid questionnaires. The results indicate that visitors consider that each unit of externality of IAS prevention and control measures significantly reduces their utility, and the magnitude equals the estimated value of externality. However, although negative externalities are inevitable, the support for IAS prevention and control measures could be maximized by adjusting the types and proportions of negative externalities. For example, visitors are willing to sacrifice up to 1.41% of the tour range in exchange for a 1% reduction in ecological shock. This study summarizes the negative externalities of IAS prevention and control measures and proposes to adjust the combination of negative externalities to reduce the shocks of those IAS prevention and control measures on the public, so as to increase the public support for IAS policies and increase the sustainability of tourism.

scholarly journals Risk assessment of Ordovician limestone water inrush in No.9 coal seam of Yangdong coal mine and its prevention and control measures

2021 ◽  
pp. 20
Author(s):  
◽  
◽  
Keyword(s):  
Prevention And Control ◽  
Water Inrush ◽  
Protective Layer ◽  
Control Measures ◽  
Risk Area ◽  
Ordovician Limestone ◽  
Relative Safety ◽  
Hydrogeological Characteristics ◽  
Prevention And Control Measures ◽  
And Control

With the increasing of mining depth, intensity, scale and speed, Ordovician limestone water has become the biggest threat to the safety production of the low group seam. Based on the existing geological data, the hydrogeological characteristics of Ordovician limestone water are analyzed; the risk of Ordovician limestone water inrush is evaluated by using the method of “five maps and double coefficients” and considering the importance of effective protective thickness of floor protective layer in the evaluation results. The results show that there are no non straight through relative safety area (Area I) and non straight type relative risk area (Area II), only non straight type water inrush risk area (Area III) and straight through water inrush risk area (Area IV). According to the evaluation results, the floor grouting reinforcement is directly adopted in Area IV, and the Ordovician limestone may need to be modified in the strong water rich area; in Area III, the grouting transformation of the floor is carried out after the area with water inrush is identified first, but the Ordovician limestone is not needed. Other prevention and control measures should be subsidiary.

scholarly journals Analyzing the country events registration of the ?safe community project using E & CFA technique: Case study of Esfahan Province

2015 ◽  
Vol 16 (SE) ◽  
pp. 461-476
Author(s):  
Hamzeh Zarei ◽  
Saeed Givehchi ◽  
Mahanaz Nasrabadi
Keyword(s):  
Safety Culture ◽  
Control Measures ◽  
Test Results ◽  
Statistical Population ◽  
Root Cause ◽  
Community Project ◽  
Statistical Sample ◽  
And Control ◽  
Safe Community

The present study aims to analyze the events of the ?safe community project of Esfahan using E & CFA technique. Safe community project includes the initial preparations for the establishment of a safety culture in societies and providing purposeful management solutions to prevent the occurrence of various events. With the aggregate of the statistics on a variety of accidents with clear definitions, a good statistical population to be examined and analyzed is created. The statistical sample in this study consists of all the victims of the events recorded in the software relating to the state ?safe community project and in the section about the investigation of accidents by questionnaire, technical experts in the staff units of Health Center No. 1 in Esfahan analyzed the two selected events in the form of responding to components associated with intermediate and root causes and provided preventive and control measures. The instruments applied in this research included a questionnaire on the analysis of intermediate and root causes and a questionnaire concerning the assessment of preventive and control measures. Also, the degree of importance of each component and its relationship with other components were evaluated using Kruskal-Wallis test and then, the intended components were ranked. Further, brainstorming sessions were held with the presence of 5 technical experts and 5-why tool and Ishikawa root cause diagram were used as a tool for investigating causal relationships in the two selected events. The test results indicated that each component in the questionnaire is not associated with other components and can be effective alone in creating the desired effect.

scholarly journals AnthropogenicSusceptibility to environmental variability of the aquaculture sector in the State of Colima, Mexico: case study

2017 ◽  
Vol 44 (3) ◽  
pp. 649-656
Author(s):  
Marco Agustin Liñan-Cabello ◽  
Ana Luz Quintanilla-Montoya ◽  
Cesar Sepúlveda-Quiroz ◽  
Omar D. Cervantes-Rosas
Keyword(s):  
Latin American ◽  
Environmental Variability ◽  
Global Climate ◽  
The State ◽  
Control Measures ◽  
Productive Capacity ◽  
Risk Areas ◽  
And Control ◽  
Aquaculture Production

In Mexico, as in many other Latin American countries, the lack of a development plan and/or prevention in aquaculture to environmental variability is evident. In the State of Colima, aquaculture presents lags in terms of technical and productive capacity especially for growing tilapia Oreochromis spp. Surveys were performed to farmers and experts, in addition to consulting scientific literature sources, and identifying different risk factors arising from the practice of aquaculture in order to assess the vulnerability of the sector. The main risk factor associated with hydrometeorological phenomena, for which the need to define high-risk areas, even more, given the uncertainty of the same due to global climate change is recognized. This study proposes to implement a comprehensive program of technological conversion and control measures for alien species that also consider aquaculture production schemes based on the efficient use of water, and to consider using this endemic species for cultivation.

scholarly journals Prevention of Water Inrushes in Deep Coal Mining over the Ordovician Aquifer: A Case Study in the Wutongzhuang Coal Mine of China

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Huichao Yin ◽  
Bin Xu ◽  
Shangxian Yin ◽  
Wuzi Tian ◽  
Hui Yao ◽  
...  
Keyword(s):  
Coal Mining ◽  
Prevention And Control ◽  
Water Pressure ◽  
Water Inrush ◽  
Mining Area ◽  
Full Time ◽  
Time Space ◽  
And Control ◽  
Ternary Structure

Through field observation and theoretical study, we found that the Hanxing mining area has a typical ternary structure in coal mining under high water pressure of the aquifer. This ternary structure is the Ordovician limestone aquifer-aquiclude including thin limestones-coal seam. Although the aquiclude is considerably thick, there is still a great risk of water burst during mining under water pressure in the deep burial environment. Multidimensional characteristics of floor water inrush in deep mining are summarized in the paper, including water migration upwardly driven by the Ordovician confined water, the planar dispersion of the water inrush channel, the stepped increase of the water inrush intensity, the hysteretic effluent of the water inrush time and the exchange, and adsorption of the water quality. The water inrush mechanism is clarified that the permeability, dilatancy, fracturing, and ascending of the water from the Ordovician limestone aquifer form a planar and divergent flow through the transfer, storage, and transportation of thin limestone aquifers. The corresponding water inrush risk evaluation equation is also proposed. Based on the thickness of the aquiclude, the thickness of the failure zones, and the water inrush coefficient, the floor aquiclude is classified into five categories. While water inrush cannot be completely controlled by the traditional underground floor reinforcement with ultra-thick aquiclude or even zonal grouting, a comprehensive prevention and control concept of the four-dimensional floor water hazard in full time-space domain are proposed. A tridimensional prevention and control model of three-dimensional reticulated exploration, treatment, verification, and supplementation is presented. A full time domain technological quality control process of condition assessment, exploration, remediation, inspection, evaluation, monitoring, and reassurance is formed, and a water disaster prevention method with full time-space tridimensional network in deep coal mining is established. Case study in the Hanxing mining area demonstrates that the proposed methods are highly effective.

Sign in / Sign up

Export Citation Format

Share Document