Mining in India has developed haphazardly with a significant part of mining activities being informal or unauthorised. Open cast quarries, coal washeries, thermal power plants, coke-oven plants, etc., contribute to se...Mining in India has developed haphazardly with a significant part of mining activities being informal or unauthorised. Open cast quarries, coal washeries, thermal power plants, coke-oven plants, etc., contribute to serious air and water pollution. The aim of this paper is to assess the QoL of residents living in Jharia coalfield. In this study, QoL domains are analysed considering the social, cultural, environmental, health and economic condition of the study areas. A path model has been developed to analyse the cascading effect on domains. The purpose of investigating path model with overall quality of life was to contribute to the subjective wellbeing literature by analyzing the predictors of OQoL in the sample population. Therefore, OQoL was used as the dependent variable of a regression analysis using four domains as variables and leveraging path analysis method to arrive at the causal model.展开更多
针对复采工作面过冒顶区时工作面易发生煤壁滑帮、端面冒漏以及顶板来压强度大等特点,以晋煤集团圣华煤业3101复采工作面为工程背景,运用相似模拟对复采工作面过冒顶区时顶板破断特征、支承压力分布特征以及支架受力状态进行研究,依据...针对复采工作面过冒顶区时工作面易发生煤壁滑帮、端面冒漏以及顶板来压强度大等特点,以晋煤集团圣华煤业3101复采工作面为工程背景,运用相似模拟对复采工作面过冒顶区时顶板破断特征、支承压力分布特征以及支架受力状态进行研究,依据相似模拟结果建立复采采场力学模型,推导液压支架支护强度的计算公式,提出复采工作面过冒顶区时的围岩控制技术。研究结果表明:(1)工作面过冒顶区时采场顶板易形成大厚度、长跨距的超前大断裂;(2)冒顶区弱化了顶板岩梁的应力传递,加剧了支承压力的荷重集度;(3)液压支架受顶板超前大断裂的影响,支架工作阻力在通过冒顶区前呈突变性增加,模拟结果支架支护阻力最大值为16 200 k N,理论计算支架支护阻力为16 110.5 k N;(4)复采工作面在通过冒顶区前必须对冒顶区进行注浆充填,同时给出支架工作阻力随充填体强度变化的关系式,为复采采场顶板控制提供理论依据。展开更多
文摘Mining in India has developed haphazardly with a significant part of mining activities being informal or unauthorised. Open cast quarries, coal washeries, thermal power plants, coke-oven plants, etc., contribute to serious air and water pollution. The aim of this paper is to assess the QoL of residents living in Jharia coalfield. In this study, QoL domains are analysed considering the social, cultural, environmental, health and economic condition of the study areas. A path model has been developed to analyse the cascading effect on domains. The purpose of investigating path model with overall quality of life was to contribute to the subjective wellbeing literature by analyzing the predictors of OQoL in the sample population. Therefore, OQoL was used as the dependent variable of a regression analysis using four domains as variables and leveraging path analysis method to arrive at the causal model.
文摘针对复采工作面过冒顶区时工作面易发生煤壁滑帮、端面冒漏以及顶板来压强度大等特点,以晋煤集团圣华煤业3101复采工作面为工程背景,运用相似模拟对复采工作面过冒顶区时顶板破断特征、支承压力分布特征以及支架受力状态进行研究,依据相似模拟结果建立复采采场力学模型,推导液压支架支护强度的计算公式,提出复采工作面过冒顶区时的围岩控制技术。研究结果表明:(1)工作面过冒顶区时采场顶板易形成大厚度、长跨距的超前大断裂;(2)冒顶区弱化了顶板岩梁的应力传递,加剧了支承压力的荷重集度;(3)液压支架受顶板超前大断裂的影响,支架工作阻力在通过冒顶区前呈突变性增加,模拟结果支架支护阻力最大值为16 200 k N,理论计算支架支护阻力为16 110.5 k N;(4)复采工作面在通过冒顶区前必须对冒顶区进行注浆充填,同时给出支架工作阻力随充填体强度变化的关系式,为复采采场顶板控制提供理论依据。
