發(fā)布時(shí)間：2018-04-08 12:02

  本文選題：采空區(qū)　切入點(diǎn)：輸電線路　出處：《中國(guó)礦業(yè)大學(xué)》2014年碩士論文

【摘要】：近年來(lái)，針對(duì)煤礦采空區(qū)的輸電線路勘測(cè)設(shè)計(jì)技術(shù)取得了一定的發(fā)展，在輸電線路勘測(cè)設(shè)計(jì)、施工、運(yùn)行等方面均積累了一定的經(jīng)驗(yàn)。但是目前我國(guó)尚無(wú)具體規(guī)范對(duì)采空區(qū)輸電線路設(shè)計(jì)提供指導(dǎo)，盡管已有多種針對(duì)輸電塔基和鐵塔的防護(hù)糾偏措施得到了實(shí)施，但是它們的適用條件和取得的效果參差不齊，并不能完全達(dá)到理想的要求。 本文從煤礦采空區(qū)輸電線路塔基的破壞機(jī)理分析出發(fā)，通過(guò)研究恒阻大變形錨桿的性能和恒阻大變形錨桿基礎(chǔ)的結(jié)構(gòu)組成，提出了煤礦采空區(qū)輸電線路巖石地基大變形錨桿基礎(chǔ)的形式，并通過(guò)理論分析、物理試驗(yàn)和數(shù)值模擬等方法，進(jìn)一步驗(yàn)證恒阻大變形錨桿基礎(chǔ)的工作機(jī)理。 首先，研究了恒阻大變形錨桿基礎(chǔ)的結(jié)構(gòu)和組成，提出了一種能適應(yīng)煤礦采空區(qū)典型高壓輸電直線塔的錨桿基礎(chǔ)結(jié)構(gòu)形式——恒阻大變形錨桿支撐復(fù)合大板基礎(chǔ)，并驗(yàn)證了錨桿受到的壓力與隨后拉開力的關(guān)系。在不同地基下沉狀態(tài)下按照是否設(shè)置錨桿的情況，采用基礎(chǔ)底面邊緣的壓應(yīng)力分布為三角形的形式，根據(jù)力和彎矩平衡方程，對(duì)一邊下沉和一角下沉狀態(tài)下的錨桿基礎(chǔ)進(jìn)行受力分析，得出了錨桿設(shè)計(jì)恒阻值、地基塌陷面積比、錨桿支撐力等參數(shù)的理論計(jì)算公式。 其次，針對(duì)支撐復(fù)合大板的恒阻大變形錨桿基礎(chǔ)進(jìn)行了物理模型試驗(yàn)，通過(guò)模擬“不同的地基塌陷面積”，對(duì)模型基礎(chǔ)施加不同工況下的作用力，得到了模型基礎(chǔ)在正常運(yùn)行、一邊下沉和一角下沉狀態(tài)下的下沉端位移和錨桿支撐力曲線，并分析了地基塌陷面積比、基礎(chǔ)上部施加荷載、錨桿桿體伸出長(zhǎng)度等因素對(duì)大板基礎(chǔ)下沉端位移和下沉側(cè)錨桿支撐力的影響。通過(guò)物理試驗(yàn)研究，，分析了錨桿對(duì)于維持基礎(chǔ)穩(wěn)定性所起到的作用。 在正常運(yùn)行、一邊下沉和一角下沉狀態(tài)下，對(duì)基礎(chǔ)和錨桿的受力與變形進(jìn)行了數(shù)值模擬，研究了不同地表變形情況對(duì)基礎(chǔ)位移和地基反力的影響，分析了錨桿直徑、錨桿長(zhǎng)度以及基礎(chǔ)剛度等因素對(duì)維持錨桿基礎(chǔ)穩(wěn)定性的影響。將數(shù)值模擬結(jié)果與理論分析結(jié)論和物理試驗(yàn)數(shù)據(jù)進(jìn)行對(duì)比，分析各種方法研究的準(zhǔn)確性，驗(yàn)證了錨桿基礎(chǔ)穩(wěn)定性研究的有效性。 最后，針對(duì)恒阻大變形錨桿基礎(chǔ)進(jìn)行安全性評(píng)估，提出了采空區(qū)高壓輸電直線塔的恒阻大變形錨桿基礎(chǔ)的適用條件、應(yīng)用方式和設(shè)計(jì)方法，并對(duì)恒阻大變形錨桿基礎(chǔ)的進(jìn)一步研究提出了展望。
[Abstract]:In recent years, the transmission line survey and design technology of coal mine goaf has made a certain development, and has accumulated certain experience in transmission line survey design, construction, operation and so on.However, there are no specific specifications in China to provide guidance for the design of transmission lines in goaf. Although a variety of protection and correction measures for transmission towers and iron towers have been implemented, their applicable conditions and effects are not uniform.It does not fully meet the desired requirements.Based on the analysis of the failure mechanism of transmission tower foundation in goaf of coal mine, this paper studies the performance of constant resistance large deformation anchor and the structure composition of constant resistance large deformation anchor foundation.This paper puts forward the form of large deformation anchor foundation of transmission line in coal mine goaf, and further verifies the working mechanism of constant resistance and large deformation anchor foundation by means of theoretical analysis, physical test and numerical simulation.Firstly, the structure and composition of large deformation anchor foundation with constant resistance and large deformation are studied, and a structure form of anchor rod foundation which can adapt to the typical high voltage transmission line tower in goaf of coal mine is put forward, that is, the composite large plate foundation with constant resistance and large deformation anchor rod support, which is suitable for the typical high voltage transmission line tower in the goaf of coal mine.The relationship between the pressure of the bolt and the subsequent pull force is verified.According to the condition of whether or not the anchor rod is installed in different subgrade subsidence condition, the compressive stress distribution on the bottom edge of the foundation is triangular, according to the equilibrium equation of force and bending moment,The stress analysis of anchor foundation under the condition of one side sinking and one corner sinking is carried out, and the theoretical calculation formulas of the design constant resistance of anchor, the ratio of ground collapse area to ground collapse area, anchor support force and so on are obtained.Secondly, the physical model test is carried out for the anchor foundation with constant resistance and large deformation. By simulating "different ground collapse area" and applying the force under different working conditions to the model foundation, the normal operation of the model foundation is obtained.The displacement curve of the sinking end and the anchor support force curve under the condition of one side sinking and one corner sinking are analyzed, and the area ratio of foundation collapse and the load on the upper part of the foundation are analyzed.The influence of the length of the anchor body on the displacement of the sinking end of the large plate foundation and the supporting force of the anchor rod on the sinking side.The effect of anchor rod on the stability of foundation is analyzed by physical experiment.Under the condition of normal operation, one side sinking and one corner sinking, the force and deformation of foundation and anchor rod are numerically simulated, the influence of different ground deformation on foundation displacement and foundation reaction force is studied, and the diameter of anchor rod is analyzed.The influence of anchor length and foundation stiffness on the stability of anchor foundation.The numerical simulation results are compared with the theoretical analysis results and the physical test data, and the accuracy of various methods is analyzed to verify the validity of the stability research of anchor foundation.Finally, according to the safety evaluation of large deformation anchor foundation with constant resistance, the suitable condition, application mode and design method of constant resistance and large deformation anchor foundation for straight line tower of high voltage transmission in goaf are put forward.Furthermore, the prospect of further research on the large deformation anchor foundation with constant resistance is put forward.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU476

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