本文選題：采動(dòng)區(qū) + 輸電鐵塔　； 參考：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：隨著我國變輸煤為輸電能源戰(zhàn)略的提出,大量輸電線路不可避免要經(jīng)過煤礦采動(dòng)沉陷區(qū)。采動(dòng)區(qū)地表沉陷會(huì)影響輸電線路安全,目前已有相關(guān)輸電鐵塔結(jié)構(gòu)的保護(hù)措施,開孔復(fù)合防護(hù)板基礎(chǔ)作為具有良好經(jīng)濟(jì)性和環(huán)保性的基礎(chǔ)形式目前已有應(yīng)用,但關(guān)于其抗變形性能尚未展開相應(yīng)的研究,因此對采用開孔防護(hù)板基礎(chǔ)的輸電鐵塔抗地表變形性能的研究具有重要的意義。研制了“輸電鐵塔地表水平變形大型模擬試驗(yàn)裝置”,以典型220k V輸電鐵塔為研究對象,進(jìn)行了獨(dú)立基礎(chǔ)和開孔復(fù)合板基礎(chǔ)輸電鐵塔及基礎(chǔ)、地基協(xié)同作用局部相似模型試驗(yàn)。分析了鐵塔結(jié)構(gòu)在地表變形影響下,結(jié)構(gòu)桿件應(yīng)力變化與支座變形值之間的規(guī)律,獲得了開孔復(fù)合防護(hù)板基礎(chǔ)中應(yīng)力變化與地表水平拉伸變形之間的規(guī)律;比較了水平地表變形下,獨(dú)立基礎(chǔ)和開孔復(fù)合板基礎(chǔ)的輸電塔架的抗變形性能,分析了開孔復(fù)合防護(hù)板基礎(chǔ)抗地表變形的有效性;同時(shí)對比分析了模型試驗(yàn)與數(shù)值模擬之間的符合程度,驗(yàn)證了數(shù)值模擬結(jié)果的可靠性。以典型220k V輸電鐵塔為研究對象,利用ANSYS程序,建立了有限元模型。分析了單獨(dú)地表變形(11種典型工況)和復(fù)合地表變形(6種典型工況)下輸電鐵塔結(jié)構(gòu)的破壞形態(tài)、桿件受力和變形的影響規(guī)律,得到了鐵塔支座位移極限值,為采動(dòng)區(qū)輸電鐵塔安全性評價(jià)提供參考。針對典型220k V輸電鐵塔,建立了輸電鐵塔、基礎(chǔ)、地基的協(xié)同作用有限元模型,研究了輸電鐵塔不同基礎(chǔ)(獨(dú)立基礎(chǔ)、復(fù)合防護(hù)板基礎(chǔ)、開孔復(fù)合板基礎(chǔ))的抗變形性能,得到了典型地表變形(拉伸變形、壓縮變形、正曲率變形、負(fù)曲率變形)作用下的表層土體變形、地基土應(yīng)力(基礎(chǔ)下土體應(yīng)力)和基底應(yīng)力、鐵塔支座位移及上部結(jié)構(gòu)內(nèi)力的變化規(guī)律。研究結(jié)果表明,復(fù)合防護(hù)板基礎(chǔ)和開孔復(fù)合板基礎(chǔ)較獨(dú)立基礎(chǔ)均具有顯著的抗地表變形能力,且開孔復(fù)合板基礎(chǔ)較復(fù)合防護(hù)板基礎(chǔ)抗地表變形能力基本相同。同時(shí)對開孔復(fù)合板基礎(chǔ)進(jìn)行抗變形優(yōu)化分析,分析研究了開孔復(fù)合板的厚度對輸電鐵塔及地基、基礎(chǔ)整體結(jié)構(gòu)抗地表變形性能的影響。研究結(jié)果表明,典型鐵塔的開孔復(fù)合板基礎(chǔ)板厚可取為鐵塔根開的1/30~1/20。同時(shí),分析了不同地基土對開孔復(fù)合板抗變形性能的影響,結(jié)果表明土質(zhì)越硬開孔復(fù)合板基礎(chǔ)的防護(hù)作用越弱,在土質(zhì)較硬的地基上建塔,應(yīng)適當(dāng)加大開孔復(fù)合板的板厚。
[Abstract]:With the strategy of transforming coal transportation into transmission energy, a large number of transmission lines will inevitably pass through the coal mining subsidence area.The ground subsidence in mining area will affect the safety of transmission line. At present, there are some protective measures for transmission tower structure, and the composite protection plate foundation with open hole has been applied as a foundation form with good economic and environmental protection at present.However, the research on the anti-deformation performance of transmission tower has not been carried out, so it is of great significance to study the anti-deformation performance of transmission tower based on open-hole protective plate.A large scale simulation test device for horizontal deformation of transmission tower surface is developed. Taking the typical 220kV transmission tower as the research object, the local similarity model test of independent foundation and perforated composite plate foundation transmission tower and its foundation is carried out.Under the influence of surface deformation, the law between stress change and support deformation value of steel tower structure is analyzed, and the law between stress change and horizontal tensile deformation of ground surface in composite plate foundation with open hole is obtained.The anti-deformation performance of transmission tower with independent foundation and open-hole composite plate foundation under horizontal surface deformation is compared, and the effectiveness of anti-ground deformation of open-hole composite plate foundation is analyzed.At the same time, the consistency between the model test and the numerical simulation is compared and analyzed, and the reliability of the numerical simulation results is verified.Taking the typical 220 kV transmission tower as the research object, the finite element model is established by using ANSYS program.In this paper, the failure patterns of transmission tower structure under 11 typical conditions of single surface deformation and 6 typical working conditions of composite ground deformation are analyzed, and the influence of stress and deformation on the members of the transmission tower are analyzed, and the limit values of the displacement of the tower support are obtained.It provides reference for safety evaluation of transmission tower in mining area.Based on the typical 220kV transmission tower, a finite element model of cooperative action of transmission tower, foundation and foundation is established, and the anti-deformation performance of different foundations (independent foundation, composite protective plate foundation, perforated composite plate foundation) of transmission tower is studied.The deformation of the surface soil, the stress of the ground soil (the stress of the soil under the foundation) and the stress of the base are obtained under the action of the typical surface deformation (tensile deformation, compression deformation, positive curvature deformation, negative curvature deformation).The change law of the displacement of the tower support and the internal force of the superstructure.The results show that the composite plate foundation and the perforated composite plate foundation have significant anti-ground deformation ability compared with the independent foundation, and the anti-surface deformation ability of the open-hole composite plate foundation is basically the same as that of the composite protective plate foundation.At the same time, the anti-deformation optimization analysis of the open-hole composite plate foundation is carried out, and the influence of the thickness of the perforated composite plate on the anti-ground deformation performance of the transmission tower and foundation is studied.The results show that the thickness of the open hole composite plate foundation of typical iron tower is 1 / 30 / 1 / 20 of that of the root of the tower.At the same time, the influence of different foundation soil on the anti-deformation performance of perforated composite plate is analyzed. The results show that the harder the soil quality is, the weaker the protective effect of the composite plate foundation is, and the thicker the plate thickness should be when the tower is built on the hard soil foundation.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU433;TM753

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