Tunnel heading stability in two dimensions(2D)has been extensively investigated by numerous scholars in the past decade.One significant limitation of 2D analysis is the absence of actual tunnel geometry modeling with ...Tunnel heading stability in two dimensions(2D)has been extensively investigated by numerous scholars in the past decade.One significant limitation of 2D analysis is the absence of actual tunnel geometry modeling with a considerable degree of idealization.Nevertheless,it is possible to study the stability of tunnels in three dimensions(3D)with a rectangular shape using finite element limit analysis(FELA)and a nonlinear programming technique.This paper employs 3D FELA to generate rigorous solutions for stability numbers,failure mechanisms,and safety factors for rectangular-shaped tunnels.To further explore the usefulness of the produced results,multivariate adaptive regression spline(MARS)is used for machine learning of big dataset and development of design equations for practical design applications.The study should be of great benefit to tunnel design practices using the developed equations provided in the paper.展开更多
煤层底板突水问题成为煤矿开采的一个重大的安全隐患,带压开采已成为深部煤炭资源开发的主要开采方式。以朱仙庄煤矿为例,研究了煤层底板突水问题,应用FLAC3D数值模拟方法预测煤层底板的采动破坏深度。通过经验公式法和数值模拟法计算,...煤层底板突水问题成为煤矿开采的一个重大的安全隐患,带压开采已成为深部煤炭资源开发的主要开采方式。以朱仙庄煤矿为例,研究了煤层底板突水问题,应用FLAC3D数值模拟方法预测煤层底板的采动破坏深度。通过经验公式法和数值模拟法计算,得出朱仙庄煤矿10煤层底板在采动后的最大破坏深度分别为26.4 m和26.2 m。结果表明,两种方法的预测值相近,验证了数值模拟的合理性。研究结果对提高矿井安全生产、预防突水灾害具有一定的理论和实践意义。The problem of water inrush from coal seam floor has become a major safety hazard in coal mining. Mining under pressure has become the main mining method for the development of deep coal resources. Taking Zhuxianzhuang Coal Mine as an example, the water inrush problem of coal seam floor is studied, and the mining failure depth of coal seam floor is predicted by FLAC3D numerical simulation method. Through the calculation of empirical formula method and numerical simulation method, it is concluded that the maximum failure depth of 10 coal seam floor in Zhuxianzhuang Coal Mine after mining is 26.4 m and 26.2 m respectively. The results show that the predicted values of the two methods are similar, which verifies the effectiveness of the numerical simulation. The research results have important theoretical and practical significance for improving mine safety production and preventing water inrush disasters.展开更多
基金supported by the Thailand Science Research and Innovation Fundamental Fund fiscal year 2023The fifth author (V.Kamchoom)acknowledges the financial support from the National Science,Research and Innovation Fund (NSRF)at King Mongkut's Institute of Technology Ladkrabang (KMITL),Thailand (Grant No.FRB66065/0258-RE-KRIS/FF66/53)+1 种基金the Climate Change and Climate Variability Research in Monsoon Asia (CMON3)from the National Research Council of Thailand (NRCT) (Grant No.N10A650844)the National Natural Science Foundation of China (NSFC).
文摘Tunnel heading stability in two dimensions(2D)has been extensively investigated by numerous scholars in the past decade.One significant limitation of 2D analysis is the absence of actual tunnel geometry modeling with a considerable degree of idealization.Nevertheless,it is possible to study the stability of tunnels in three dimensions(3D)with a rectangular shape using finite element limit analysis(FELA)and a nonlinear programming technique.This paper employs 3D FELA to generate rigorous solutions for stability numbers,failure mechanisms,and safety factors for rectangular-shaped tunnels.To further explore the usefulness of the produced results,multivariate adaptive regression spline(MARS)is used for machine learning of big dataset and development of design equations for practical design applications.The study should be of great benefit to tunnel design practices using the developed equations provided in the paper.
文摘煤层底板突水问题成为煤矿开采的一个重大的安全隐患,带压开采已成为深部煤炭资源开发的主要开采方式。以朱仙庄煤矿为例,研究了煤层底板突水问题,应用FLAC3D数值模拟方法预测煤层底板的采动破坏深度。通过经验公式法和数值模拟法计算,得出朱仙庄煤矿10煤层底板在采动后的最大破坏深度分别为26.4 m和26.2 m。结果表明,两种方法的预测值相近,验证了数值模拟的合理性。研究结果对提高矿井安全生产、预防突水灾害具有一定的理论和实践意义。The problem of water inrush from coal seam floor has become a major safety hazard in coal mining. Mining under pressure has become the main mining method for the development of deep coal resources. Taking Zhuxianzhuang Coal Mine as an example, the water inrush problem of coal seam floor is studied, and the mining failure depth of coal seam floor is predicted by FLAC3D numerical simulation method. Through the calculation of empirical formula method and numerical simulation method, it is concluded that the maximum failure depth of 10 coal seam floor in Zhuxianzhuang Coal Mine after mining is 26.4 m and 26.2 m respectively. The results show that the predicted values of the two methods are similar, which verifies the effectiveness of the numerical simulation. The research results have important theoretical and practical significance for improving mine safety production and preventing water inrush disasters.
