超前支护装备—顶板系统力学特性研究
发布时间：2018-09-16 20:33
【摘要】：掘进工作面顶板冒落一直是煤矿安全生产的重大问题之一。造成这一现象的原因多种多样,最根本的还是在于目前煤矿掘进工作面临时支护方式难以适应煤矿安全高效掘进需要。在此背景下,众多临时支护设备、方案被提出并在掘进工作面得到运用。然而,目前国内对巷道临时支架的研究主要侧重于支架结构性能,产品设计偏重于经验设计,没有对支护设备与顶板的耦合力学问题进行系统研究,这就使设备从设计阶段就具有盲目性,设计出的产品是否满足顶板的支护需求要在现场应用一段时间后才能明确。针对这个问题,本文依托国家自然科学基金项目“迈步式超前支护装备与掘进迎头顶板动力耦合机理研究(编号：51304107)”,对超前支护装备-顶板耦合系统力学问题进行研究。依据超前支护装备设备参数,建立超前支护装备-顶板体系力学分析模型。利用理论力学、材料力学相关理论对超前支护装备进行静力学建模,利用有限差分理论对顶板(这里假设顶板为薄板)进行静力学建模。基于变形协调原理求解出超前支护装备及顶板在顶板受均布载荷、边界条件为“三边固支,一边简支”情况下的变形量；基于有限元理论,将超前支护装备立柱视作杆单元,横纵梁视作梁单元,横纵梁接触处、横梁与立柱接触处及纵梁与顶板接触处视作弹簧阻尼单元,将顶板(薄板)离散成有限个板元。根据能量理论,对超前支护装备-顶板体系进行基于能量理论的动力学建模,得到超前支护装备-顶板体系振动控制方程；利用凝聚技术缩减有限元动力模型的自由度数,利用Wilson-β法对动力响应进行数值求解;基于ANSYS有限元分析软件建立超前支护装备-顶板体系仿真模型,模拟“三边固支,一边简支”顶板受均布载荷时,顶板及超前支护装备应力状态、变形状态。研究顶板-超前支护装备多点分布接触及全接触态单组支撑静力学响应；基于ANSYS软件动力学有限元分析模块建立超前支护装备-顶板体系动力学仿真模型,模拟超前支护装备底座受矿震荷载时超前支护装备-顶板体系动态响应。对超前支护装备、顶板分别进行模态分析,找出固有频率及振型,为超前支护装备防共振设计提供依据。
[Abstract]:Roof caving is one of the most important problems in coal mine safety production. There are many reasons for this phenomenon, the most fundamental reason is that the temporary support mode of coal mining face is difficult to meet the needs of coal mine safety and efficient tunneling. In this context, a number of temporary support equipment, the scheme was put forward and applied in the heading face. However, at present, the domestic research on the temporary support of roadway is mainly focused on the performance of the support structure, the product design is focused on the empirical design, and there is no systematic study on the coupling mechanics between the supporting equipment and the roof. This makes the equipment from the design stage of blindness, whether the product designed to meet the roof support needs must be applied in the field for a period of time before it can be clear. In order to solve this problem, this paper, relying on the project of National Natural Science Foundation of China "Research on dynamic Coupling Mechanism of Step-forward supporting equipment and head-on Roof (No.: 51304107)", studies the mechanical problems of the coupling system of advanced support equipment and roof. According to the equipment parameters of advanced support equipment, the mechanical analysis model of advance support equipment-roof system is established. The statics modeling of advanced support equipment is carried out by using the theory of theoretical mechanics and material mechanics, and the statics model of roof (which is assumed to be a thin plate) by the finite difference theory. Based on the principle of deformation coordination, the deformation of advance support equipment and roof under uniform load on roof is solved, and the boundary condition is "triangularly fixed support, one side simply supported". Based on the finite element theory, the pillar of advanced support equipment is regarded as a bar element. The transverse beam is regarded as the element of the beam, the contact of the transverse beam, the contact between the beam and the column, and the contact between the longitudinal beam and the roof is regarded as the spring damping element, and the roof (thin plate) is discretized into finite plate elements. According to the energy theory, the dynamic modeling based on energy theory is carried out on the advanced support equipment-roof system, and the vibration control equation of the lead-support equipment-roof system is obtained, and the number of degrees of freedom of the finite element dynamic model is reduced by the condensation technique. The dynamic response is solved numerically by using Wilson- 尾 method, and the simulation model of advance support equipment roof system is established based on ANSYS finite element analysis software. Roof and advance support equipment stress state, deformation state. In this paper, the multi-point distributed contact and full contact static response of single support in roof advance support equipment are studied, and the dynamic simulation model of advance support equipment roof system is established based on ANSYS software dynamics finite element analysis module. The dynamic response of the roof system is simulated when the base of the advanced support equipment is subjected to mine earthquake. The modal analysis is carried out to find out the natural frequency and vibration pattern of the advanced support equipment and roof respectively, which provides the basis for the design of the antiresonance of the advanced support equipment.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD355
本文编号：2244713
[Abstract]:Roof caving is one of the most important problems in coal mine safety production. There are many reasons for this phenomenon, the most fundamental reason is that the temporary support mode of coal mining face is difficult to meet the needs of coal mine safety and efficient tunneling. In this context, a number of temporary support equipment, the scheme was put forward and applied in the heading face. However, at present, the domestic research on the temporary support of roadway is mainly focused on the performance of the support structure, the product design is focused on the empirical design, and there is no systematic study on the coupling mechanics between the supporting equipment and the roof. This makes the equipment from the design stage of blindness, whether the product designed to meet the roof support needs must be applied in the field for a period of time before it can be clear. In order to solve this problem, this paper, relying on the project of National Natural Science Foundation of China "Research on dynamic Coupling Mechanism of Step-forward supporting equipment and head-on Roof (No.: 51304107)", studies the mechanical problems of the coupling system of advanced support equipment and roof. According to the equipment parameters of advanced support equipment, the mechanical analysis model of advance support equipment-roof system is established. The statics modeling of advanced support equipment is carried out by using the theory of theoretical mechanics and material mechanics, and the statics model of roof (which is assumed to be a thin plate) by the finite difference theory. Based on the principle of deformation coordination, the deformation of advance support equipment and roof under uniform load on roof is solved, and the boundary condition is "triangularly fixed support, one side simply supported". Based on the finite element theory, the pillar of advanced support equipment is regarded as a bar element. The transverse beam is regarded as the element of the beam, the contact of the transverse beam, the contact between the beam and the column, and the contact between the longitudinal beam and the roof is regarded as the spring damping element, and the roof (thin plate) is discretized into finite plate elements. According to the energy theory, the dynamic modeling based on energy theory is carried out on the advanced support equipment-roof system, and the vibration control equation of the lead-support equipment-roof system is obtained, and the number of degrees of freedom of the finite element dynamic model is reduced by the condensation technique. The dynamic response is solved numerically by using Wilson- 尾 method, and the simulation model of advance support equipment roof system is established based on ANSYS finite element analysis software. Roof and advance support equipment stress state, deformation state. In this paper, the multi-point distributed contact and full contact static response of single support in roof advance support equipment are studied, and the dynamic simulation model of advance support equipment roof system is established based on ANSYS software dynamics finite element analysis module. The dynamic response of the roof system is simulated when the base of the advanced support equipment is subjected to mine earthquake. The modal analysis is carried out to find out the natural frequency and vibration pattern of the advanced support equipment and roof respectively, which provides the basis for the design of the antiresonance of the advanced support equipment.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD355
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