【摘要】：掘進工作面頂板冒落一直是煤礦安全生產(chǎn)的重大問題之一。造成這一現(xiàn)象的原因多種多樣,最根本的還是在于目前煤礦掘進工作面臨時支護方式難以適應(yīng)煤礦安全高效掘進需要。在此背景下,眾多臨時支護設(shè)備、方案被提出并在掘進工作面得到運用。然而,目前國內(nèi)對巷道臨時支架的研究主要側(cè)重于支架結(jié)構(gòu)性能,產(chǎn)品設(shè)計偏重于經(jīng)驗設(shè)計,沒有對支護設(shè)備與頂板的耦合力學(xué)問題進行系統(tǒng)研究,這就使設(shè)備從設(shè)計階段就具有盲目性,設(shè)計出的產(chǎn)品是否滿足頂板的支護需求要在現(xiàn)場應(yīng)用一段時間后才能明確。針對這個問題,本文依托國家自然科學(xué)基金項目“邁步式超前支護裝備與掘進迎頭頂板動力耦合機理研究(編號：51304107)”,對超前支護裝備-頂板耦合系統(tǒng)力學(xué)問題進行研究。依據(jù)超前支護裝備設(shè)備參數(shù),建立超前支護裝備-頂板體系力學(xué)分析模型。利用理論力學(xué)、材料力學(xué)相關(guān)理論對超前支護裝備進行靜力學(xué)建模,利用有限差分理論對頂板(這里假設(shè)頂板為薄板)進行靜力學(xué)建模。基于變形協(xié)調(diào)原理求解出超前支護裝備及頂板在頂板受均布載荷、邊界條件為“三邊固支,一邊簡支”情況下的變形量；基于有限元理論,將超前支護裝備立柱視作桿單元,橫縱梁視作梁單元,橫縱梁接觸處、橫梁與立柱接觸處及縱梁與頂板接觸處視作彈簧阻尼單元,將頂板(薄板)離散成有限個板元。根據(jù)能量理論,對超前支護裝備-頂板體系進行基于能量理論的動力學(xué)建模,得到超前支護裝備-頂板體系振動控制方程；利用凝聚技術(shù)縮減有限元動力模型的自由度數(shù),利用Wilson-β法對動力響應(yīng)進行數(shù)值求解;基于ANSYS有限元分析軟件建立超前支護裝備-頂板體系仿真模型,模擬“三邊固支,一邊簡支”頂板受均布載荷時,頂板及超前支護裝備應(yīng)力狀態(tài)、變形狀態(tài)。研究頂板-超前支護裝備多點分布接觸及全接觸態(tài)單組支撐靜力學(xué)響應(yīng)；基于ANSYS軟件動力學(xué)有限元分析模塊建立超前支護裝備-頂板體系動力學(xué)仿真模型,模擬超前支護裝備底座受礦震荷載時超前支護裝備-頂板體系動態(tài)響應(yīng)。對超前支護裝備、頂板分別進行模態(tài)分析,找出固有頻率及振型,為超前支護裝備防共振設(shè)計提供依據(jù)。
[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.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD355

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