本文選題：高邊坡 + 抗滑樁　； 參考：《廣東工業(yè)大學(xué)》2013年碩士論文

【摘要】：預(yù)應(yīng)力錨索抗滑樁支護(hù)結(jié)構(gòu)是由預(yù)應(yīng)力錨索和抗滑樁支護(hù)結(jié)構(gòu)組合形成的一種新型支護(hù)結(jié)構(gòu),其受力和結(jié)構(gòu)形式更加合理,兼有預(yù)應(yīng)力錨索和抗滑樁支護(hù)結(jié)構(gòu)二者的優(yōu)點(diǎn),實(shí)際工程應(yīng)用中既能充分發(fā)揮材料的強(qiáng)度,又能滿足經(jīng)濟(jì)合理的要求,還能大大提高邊坡的整體穩(wěn)定性。目前已在工程實(shí)踐中得到越來越廣泛的應(yīng)用,但在理論研究方面還未取得較大突破,理論研究成果遠(yuǎn)遠(yuǎn)滯后于工程實(shí)踐。本文在國(guó)內(nèi)外研究現(xiàn)狀的基礎(chǔ)上,結(jié)合相關(guān)的研究成果,采用大型有限元分析軟件MIDAS/GTS對(duì)預(yù)應(yīng)力錨索抗滑樁的支護(hù)效果進(jìn)行深入分析,并將模擬結(jié)果與工程實(shí)際監(jiān)測(cè)結(jié)果對(duì)比,驗(yàn)證所選模型參數(shù)是否合理。文中以邊坡安全系數(shù)為主要目標(biāo)函數(shù),對(duì)抗滑樁截面尺寸、樁錨固深度、抗滑樁埋設(shè)位置、樁間凈距和錨索錨固段長(zhǎng)度、錨索方向角以及錨索預(yù)應(yīng)力等參數(shù)的選用做進(jìn)一步優(yōu)化,最終使樁、錨索、邊坡三者在采用最佳優(yōu)化參數(shù)的條件下,預(yù)應(yīng)力錨索抗滑樁能提供最小的抵抗力或者發(fā)揮最大的安全系數(shù)。相關(guān)優(yōu)化參數(shù)的選用可為類似的高邊坡工程提供一定的參考。 本文開展的工作主要包括以下幾個(gè)方面： 1、通過閱讀大量相關(guān)文獻(xiàn),從試驗(yàn)、計(jì)算及優(yōu)化設(shè)計(jì)三方面重點(diǎn)論述預(yù)應(yīng)力錨索抗滑樁加固技術(shù)的研究現(xiàn)狀。對(duì)預(yù)應(yīng)力錨索和抗滑樁的作用機(jī)理做了簡(jiǎn)要論述,并分析兩種支護(hù)結(jié)構(gòu)單獨(dú)支護(hù)與聯(lián)合支護(hù)時(shí)的區(qū)別,提出最優(yōu)支護(hù)方式。 2、介紹了有限元和土體本構(gòu)關(guān)系相關(guān)理論,歸納總結(jié)不同本構(gòu)模型的應(yīng)用條件及范圍,選出適合本文實(shí)際情況的本構(gòu)模型,同時(shí)對(duì)有限元數(shù)值模擬分析的研究思路及邊坡和相關(guān)支護(hù)結(jié)構(gòu)所采用的模型做了簡(jiǎn)單介紹。 3、結(jié)合廣東西部沿海高速公路K21+240標(biāo)段高邊坡相關(guān)地質(zhì)勘探資料,采用MIDAS/GTS有限元軟件,對(duì)不同階段采用不同支護(hù)方式時(shí)邊坡的安全系數(shù)和位移特征及支護(hù)結(jié)構(gòu)的內(nèi)力做了詳細(xì)分析。通過將模擬結(jié)果與實(shí)際監(jiān)測(cè)結(jié)果進(jìn)行對(duì)比,驗(yàn)證所選模型的參數(shù)是否合理,并進(jìn)一步得出邊坡和支護(hù)結(jié)構(gòu)變形及內(nèi)力分布的規(guī)律。 4、在原有合理模型參數(shù)的基礎(chǔ)上,以邊坡安全系數(shù)為主要目標(biāo)函數(shù),采用單一因素法對(duì)樁截面尺寸、樁錨固深度、樁埋設(shè)位置、相鄰樁間凈距、錨索錨固段長(zhǎng)度、錨索方向角以及錨索預(yù)應(yīng)力的大小等相關(guān)參數(shù)進(jìn)行優(yōu)化,最終使預(yù)應(yīng)力錨索抗滑樁能提供最小的抵抗力或者發(fā)揮最大的安全系數(shù),最后出相應(yīng)的優(yōu)化值。 5、總結(jié)并歸納本文的主要研究成果,同時(shí)指出文中的不足及有待進(jìn)一步解決的問題,并在此基礎(chǔ)上對(duì)預(yù)應(yīng)力錨索抗滑樁桃支的技術(shù)的研究提出了展望。
[Abstract]:The prestressed anchor cable anti-slide pile support structure is a new type of support structure formed by the combination of prestressed anchor cable and anti-slide pile support structure. Its force and structure form are more reasonable, and it has the advantages of both prestressed anchor cable and anti-slide pile support structure.In practical engineering application, the strength of the material can be brought into full play, the economic and reasonable requirements can be met, and the overall stability of the slope can be greatly improved.At present, it has been more and more widely used in engineering practice, but it has not made a great breakthrough in theoretical research, and the theoretical research results lag far behind engineering practice.In this paper, based on the current research situation at home and abroad, combined with the related research results, a large-scale finite element analysis software MIDAS/GTS is used to deeply analyze the support effect of prestressed anchor cable anti-slide pile, and the simulation results are compared with the actual monitoring results.Verify that the selected model parameters are reasonable.In this paper, the safety factor of slope is taken as the main objective function, the cross-section dimension of anti-slide pile, the anchoring depth of pile, the embedding position of anti-slide pile, the net distance between piles and the length of anchoring section of Anchorage cable are discussed.The selection of anchor cable direction angle and anchor cable prestress is further optimized so that the pile, anchor cable and slope can be optimized under the condition of optimum parameters.Pre-stressed anchor-cable anti-slide pile can provide minimum resistance or maximum safety factor.The selection of relevant optimization parameters can provide a certain reference for similar high slope engineering.The work carried out in this paper mainly includes the following aspects:1. Through reading a large number of related documents, this paper mainly discusses the research status of anti-slide pile reinforcement technology of prestressed anchor cable from three aspects of test, calculation and optimization design.This paper briefly discusses the action mechanism of prestressed anchor cable and anti-slide pile, analyzes the differences between the two kinds of supporting structures when they are supported separately and jointly, and puts forward the optimum supporting method.2. The relevant theories of finite element and soil constitutive relation are introduced, the application conditions and scope of different constitutive models are summarized, and the constitutive models suitable for the actual situation of this paper are selected.At the same time, the research idea of finite element numerical simulation analysis and the model of slope and related supporting structure are introduced briefly.3. Based on the geological exploration data of high slope in K21,240 section of western Guangdong coastal highway, MIDAS/GTS finite element software is used.The safety factor and displacement characteristics of the slope and the internal force of the supporting structure are analyzed in detail when different supporting methods are adopted in different stages.By comparing the simulation results with the actual monitoring results, the parameters of the selected model are verified to be reasonable, and the law of deformation and internal force distribution of slope and supporting structure is obtained.4. On the basis of the original reasonable model parameters, taking the safety factor of slope as the main objective function, the single factor method is used to analyze the pile cross-section size, pile anchoring depth, pile embedding position, the net distance between adjacent piles, the length of anchor cable anchoring section.The relative parameters such as the direction angle of the anchor cable and the prestressing force of the anchor cable are optimized so that the anti-slide pile of the prestressed anchor cable can provide the minimum resistance or give play to the maximum safety factor. Finally the corresponding optimization value is given.5. The main research results of this paper are summarized and summarized. At the same time, the shortcomings of the paper and the problems to be solved are pointed out. On this basis, the prospect of the research on the technique of prestressed anchor cable anti-slide pile peach support is put forward.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU473.1

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