發(fā)布時間：2018-01-09 01:16

  本文關(guān)鍵詞：預(yù)應(yīng)力錨固研究與工程應(yīng)用　出處：《中國水利水電科學(xué)研究院》2013年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 預(yù)應(yīng)力錨索 錨固段 荷載傳遞機理 預(yù)應(yīng)力虧損 錨索設(shè)計施工 錨索監(jiān)測

【摘要】：隨著我國經(jīng)濟建設(shè)的快速發(fā)展,城市化進程的不斷加快,我國的基礎(chǔ)設(shè)施建設(shè)正處于一個蓬勃發(fā)展的時期,在諸如水電、交通、能源等各種基礎(chǔ)設(shè)施建設(shè)中產(chǎn)生了大量的高邊坡和基坑工程。預(yù)應(yīng)力錨索錨固系統(tǒng)能夠有效的激發(fā)巖土體潛在承載能力,充分發(fā)揮巖土體自身強度,提高巖土體的自身穩(wěn)定性,且其施工工程量小、安全性高、工期快、消耗小,具有極高的投入產(chǎn)出比。該錨固技術(shù)自誕生以來就頗受工程設(shè)計者及施工人員的青睞,在諸如水利、公路、鐵路等各種工程的滑坡治理、高邊坡支護工程中廣泛應(yīng)用。 本文針對預(yù)應(yīng)力錨索的荷載傳遞機理、預(yù)應(yīng)力錨索的應(yīng)力虧損機理及預(yù)應(yīng)力錨索長期性能進行系統(tǒng)研究。結(jié)合實際高邊坡預(yù)應(yīng)力錨索加固工程提出邊坡變形機制分析方法及邊坡穩(wěn)定性分析方法,并基于發(fā)明專利“壓力分散型錨索的內(nèi)錨固承載體”進行預(yù)應(yīng)力錨索的設(shè)計,同時對預(yù)應(yīng)力錨索施工過程進行探討研究。在預(yù)應(yīng)力錨索監(jiān)測方面,文章分析了基十磁通量傳感器的檢測系統(tǒng),并主要對光纖光柵的檢測手段進行研究。 本文具體研究內(nèi)容包括以下幾個方面： (1)對預(yù)應(yīng)力錨索錨固段荷載傳遞解析進行探索,基于彈性力學(xué)凱爾文(kelvin)問題彈性解推導(dǎo)預(yù)應(yīng)力錨索內(nèi)錨固段應(yīng)力分布彈性解。根據(jù)壓力型錨索的主要失效模式從理論上分析了壓力型錨索荷載傳遞機制。在考慮灌漿體三向受力狀態(tài)的前提下,選擇合適的荷載傳遞模型建立反映壓力型錨索灌漿體與巖體粘接界面相互作用規(guī)律的基本方程,求解界面剪應(yīng)力分布規(guī)律以及灌漿體中軸向應(yīng)力應(yīng)變分布規(guī)律。同時,分析了不同巖體、錨固體材料參數(shù)對應(yīng)力分布的影響。理論上解釋了壓力型預(yù)應(yīng)力錨索的荷載傳遞特點及主要影響因素�；诿鞯铝纸�,采用積分法分析壓力型巖錨錨固段周圍巖體中的應(yīng)力分布情況 (2)從預(yù)應(yīng)力錨索錨固材料性質(zhì)、被錨固介質(zhì)力學(xué)性質(zhì)、施工工藝及運行管理水平等多方面對預(yù)應(yīng)力錨索預(yù)應(yīng)力虧損進行分析研究。對錨墩基礎(chǔ)沉降量引起的預(yù)應(yīng)力虧損進行研究,考慮了預(yù)應(yīng)力錨墩下土體在三向應(yīng)力作用下的變形影響,引入土體彈塑性本構(gòu)關(guān)系來闡述土體的變形特性,進而研究錨墩基礎(chǔ)沉降引起的錨索預(yù)應(yīng)力虧損。 (3)針對預(yù)應(yīng)力錨索錨固的預(yù)應(yīng)力虧損,討論預(yù)應(yīng)力錨索長期性能的綜合控制措施,為工程設(shè)計及施工提供一定的參考依據(jù)。 (4)結(jié)合實際工程,對高邊坡進行預(yù)應(yīng)力錨固設(shè)計,在地質(zhì)分析的基礎(chǔ)上,選擇典型剖面計算不同工作狀態(tài)下的應(yīng)力、應(yīng)變,總結(jié)出邊坡破壞模式,利用反演法推導(dǎo)力學(xué)參數(shù)計算邊坡穩(wěn)定加固荷載。基于發(fā)明專利“壓力分散型錨索的內(nèi)錨固承載體”進行預(yù)應(yīng)力錨索的設(shè)計,同時對預(yù)應(yīng)力錨索施工技術(shù)要領(lǐng)進行分析研究。 (5)對預(yù)應(yīng)力錨索的監(jiān)測進行研究,包括監(jiān)測內(nèi)容、項目、監(jiān)測的基本要求等方面,研究基于磁通量的預(yù)應(yīng)力錨索監(jiān)測系統(tǒng),主要對光纖光柵的檢測手段進行研究,改進現(xiàn)有預(yù)應(yīng)力錨索鋼絞線形成基于光纖光柵傳感器的智能鋼絞線,對智能鋼絞線的應(yīng)力傳感性能、溫度傳感性能等方面進行試驗,證明智能鋼絞線完全能滿足用于拉索測量的基本條件。
[Abstract]:With the rapid development of China's economic construction, city urbanization process accelerating, the infrastructure construction of our country is in a period of vigorous development, such as hydropower, traffic, a large number of high slope and foundation pit engineering to produce energy and other infrastructure construction. The pre stress anchorage system can stimulate the potential bearing the ability of rock and soil effectively, give full play to the strength of rock and soil, improve soil stability, and the construction quantity is small, high safety, short construction period, low consumption and high input-output ratio. The anchoring technology since the birth of popular engineering designers and construction personnel in favor of highway such as water conservancy, landslide, railway engineering, application of high slope supporting engineering.
In this paper, according to the load transfer mechanism of prestressed anchor cable system, research the long-term performance of power loss mechanism and prestressed anchor for prestressed anchor cable. Combined with the actual high prestressed anchor cable in slope engineering is proposed analysis method of slope deformation mechanism and slope stability analysis method, and based on the design of a patented invention of pressure dispersion type anchorage cable internal anchoring bearing carrier of prestressed anchor cable at the same time, to study the construction process of prestressed anchor cable in prestressed anchor cable monitoring, this paper analyzes the detecting system based on ten magnetic flux sensor, and the main detection methods of fiber grating are studied.
The specific research contents of this paper include the following aspects:
(1) on the anchorage load transfer analysis to explore the elastic Kelvin (Kelvin) is based on the prestressed anchor within the anchorage section stress distribution of elastic solution of elastic solution. According to the main failure mode of the pressure type cable from the theoretical analysis of the pressure type cable load transfer mechanism. Considering the grouting condition to three the stress state of the transfer, basic equation model can reflect the law of pressure type anchor grouting and rock bonding interface interaction by selecting the appropriate load, solving the interfacial shear axial force distribution and grouting in stress and strain distributions. At the same time, analyzes the influence of different rock mass, anchor solid material parameters on the stress distribution. The theory explains the characteristics and main influencing factors of load transfer pressure type prestressed anchor. Based on Mindlin solution, using integral method around the analysis of compression rock anchor anchorage Stress distribution in rock mass
(2) from the properties of the prestressed anchorage materials, anchored medium mechanical properties analysis of prestressed anchor cable prestress loss on construction technology and operation management level. To study the loss caused by prestressed anchor pier foundation settlement, considering the prestressed anchor pier in soil under three to be deformation under the action of stress the deformation characteristics, the elastoplastic constitutive relationship of soil, and study the anchor pier prestress loss caused by foundation settlement.
(3) in view of the prestress loss of prestressed anchor cable, the comprehensive control measures for long-term performance of prestressed anchor cable are discussed, which will provide some reference for engineering design and construction.
(4) combined with the actual engineering, prestressed anchor design of high slope, on the basis of geological analysis, selecting typical sections are calculated in different working condition of stress, strain, summed up the failure mode of the slope, calculation of slope reinforcement load using the inversion method is designed. The mechanical parameters of prestressed anchor cable in Anchorage "invention patent pressure dispersion type anchorage cable carrier" based on the analysis and research of prestressed anchor cable construction technology essentials.
(5) study on monitoring of prestressed anchor rope, including monitoring content, monitoring project, the basic requirements, the research of prestressed anchor cable monitoring system based on the magnetic flux, the fiber grating detection method research, improvement of existing prestressed anchor cable steel strand formed intelligent steel strand based on fiber grating sensor, the intelligent steel strand the stress sensing properties, temperature sensing performance and other aspects of the test, that smart steel strand can meet the basic conditions for the measurement of the cable.

【學(xué)位授予單位】：中國水利水電科學(xué)研究院
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TU476

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