抗动压井壁结构型式优化研究
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摘要
为了合理利用现有煤炭资源,国家加大了对现有小产量煤矿进行必要的技术改造。在此背景下,各煤炭企业在新技术、新理论的支持下进行无保护煤柱或小保护煤柱开采。然而,无保护煤柱或小保护煤柱开采会造成井壁的开裂,严重时会使井壁产生弯曲、剪切破坏,影响煤矿的安全生产,甚至会造成严重的停产事故。因此研究采动区内抗动压井壁结构型式具有重要的实际应用价值。
鉴于此,本文采用数值模拟和理论计算的方法对采动区内井壁的受力特征进行研究,为采动区内的井壁结构型式设计提供参考。本文研究的主要内容如下:首先,通过FLAC3D模拟研究采动区内素混凝土井壁结构、钢筋混凝土井壁结构、壁外加垫层井壁结构、壁内设垫块井壁结构的受力特点,并对垫层的厚度、刚度和垫块的设置位置进行研究;其次,本文在建立横观各向同性条件下层状开孔岩体内的应力应变本构关系的基础上,研究了开孔层状岩体内附加应力对井壁的作用;最后,通过数值模拟和理论计算的结果对比分析研究不同保护煤柱下井壁的受力规律和采动区内不同井壁结构的抗采动性能,并对采区内的抗动压井壁结构进行优化。
In order to use the existing resources of coal,the state has increased output of the existing small coal mines to carry out the necessary technology.In this context,with the support of the new technology and new theory,the coal enterprises carry out no protection of coal pillars mining or small protection of coal pillars mining.But no protection of coal pillars mining or small protection of coal pillars mining will cause damage to the shaft.Seriously,it will have a curved shaft and shear failure、will affect the coal mine production safety and even lead to serious production accidents.So the study of anti-mining region of dynamic pressure in the form of shaft structure has an important value.
In view of this,Using of numerical simulation and theoretical calculation methods,this article studying the characteristics of force of the shaft which lying in mining region and providing reference to shaft designed in mining region.The main contents are as follows;First of all,studying the characteristics of mechanics of the concrete shaft structure、reinforced concrete shaft structure、plus a cushion to outboard of reinforced concrete shaft structure、plus a pad to inner of reinforced concrete shaft structure by FLAC3D simulation of mining,also studying the thickness and stiffness of the cushion、the stiffness and position of the pad affect force of the shaft structure;Second,studying on the opening of layered rocks in the body of additional stress on the shaft which on the basis of deducting opening of layered rocks in the body's stress-strain constitutive relations under the conditions of the transversely isotropic;Finally,through comparative analysis of the numerical simulation results and the results of flexible calculation,studying the law of force of the shaft and the anti-mining properties of the different structure of shaft under conditions different protection of coal pillars,optimizing the Anti-dynamic pressure shaft structure in the region of mining area.
鉴于此,本文采用数值模拟和理论计算的方法对采动区内井壁的受力特征进行研究,为采动区内的井壁结构型式设计提供参考。本文研究的主要内容如下:首先,通过FLAC3D模拟研究采动区内素混凝土井壁结构、钢筋混凝土井壁结构、壁外加垫层井壁结构、壁内设垫块井壁结构的受力特点,并对垫层的厚度、刚度和垫块的设置位置进行研究;其次,本文在建立横观各向同性条件下层状开孔岩体内的应力应变本构关系的基础上,研究了开孔层状岩体内附加应力对井壁的作用;最后,通过数值模拟和理论计算的结果对比分析研究不同保护煤柱下井壁的受力规律和采动区内不同井壁结构的抗采动性能,并对采区内的抗动压井壁结构进行优化。
In order to use the existing resources of coal,the state has increased output of the existing small coal mines to carry out the necessary technology.In this context,with the support of the new technology and new theory,the coal enterprises carry out no protection of coal pillars mining or small protection of coal pillars mining.But no protection of coal pillars mining or small protection of coal pillars mining will cause damage to the shaft.Seriously,it will have a curved shaft and shear failure、will affect the coal mine production safety and even lead to serious production accidents.So the study of anti-mining region of dynamic pressure in the form of shaft structure has an important value.
In view of this,Using of numerical simulation and theoretical calculation methods,this article studying the characteristics of force of the shaft which lying in mining region and providing reference to shaft designed in mining region.The main contents are as follows;First of all,studying the characteristics of mechanics of the concrete shaft structure、reinforced concrete shaft structure、plus a cushion to outboard of reinforced concrete shaft structure、plus a pad to inner of reinforced concrete shaft structure by FLAC3D simulation of mining,also studying the thickness and stiffness of the cushion、the stiffness and position of the pad affect force of the shaft structure;Second,studying on the opening of layered rocks in the body of additional stress on the shaft which on the basis of deducting opening of layered rocks in the body's stress-strain constitutive relations under the conditions of the transversely isotropic;Finally,through comparative analysis of the numerical simulation results and the results of flexible calculation,studying the law of force of the shaft and the anti-mining properties of the different structure of shaft under conditions different protection of coal pillars,optimizing the Anti-dynamic pressure shaft structure in the region of mining area.
引文
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