本文選題：滑坡 + 抗滑樁��； 參考：《天津大學(xué)》2014年博士論文

【摘要】：鑒于山體滑坡造成的巨大經(jīng)濟(jì)損失和人員傷害,采用抗滑樁來加固邊坡為工程界常用的工程對(duì)策,同時(shí)不斷出現(xiàn)新的抗滑樁類型。本文總結(jié)了滑坡災(zāi)害發(fā)生的危險(xiǎn)性與危害性及抗滑樁在滑坡災(zāi)害治理中的研究進(jìn)展,提出并研究了目前抗滑樁設(shè)計(jì)及計(jì)算中存在的幾個(gè)問題。鑒于抗滑樁與土相互作用的復(fù)雜性,針對(duì)目前抗滑樁工程常用的極限平衡計(jì)算方法難以考慮抗滑樁與土相互作用的問題,本文借助ABAQUS有限元軟件,通過結(jié)合工程實(shí)例,對(duì)不同型式的抗滑樁對(duì)邊坡的加固效果進(jìn)行了相關(guān)三維數(shù)值模擬,對(duì)抗滑樁作用下邊坡及樁身的應(yīng)力應(yīng)變規(guī)律進(jìn)行了歸納分析,在此基礎(chǔ)上探討了不同樁型的抗滑機(jī)理和加固效果,得出了一些創(chuàng)新性的有益的結(jié)論,為抗滑樁工程設(shè)計(jì)提供了理論依據(jù)及應(yīng)力應(yīng)變參考規(guī)律。本文的主要研究內(nèi)容及創(chuàng)新點(diǎn)如下:1、常規(guī)抗滑樁設(shè)計(jì)計(jì)算難以考慮樁土相互作用,因此做了一些簡化的假定。本文考慮樁土相互作用,以實(shí)際工程中常見的1.5m×2m的抗滑樁(對(duì)應(yīng)的等代截面面積的圓截面樁樁徑為1.96m)為例,通過三維數(shù)值分析,詳細(xì)探討了邊坡加固工程中的樁身土壓力分布型式、樁周土體位移等值線特點(diǎn)及邊坡穩(wěn)定系數(shù)與樁間距的關(guān)系、樁頂脫開變形、邊坡塑性變形、樁身內(nèi)力、樁身位移等設(shè)計(jì)中的關(guān)鍵因素。2、遇到大型、深層、下滑力大的滑坡,常規(guī)抗滑樁往往抗彎、抗剪承載力不足。當(dāng)抗滑樁加固范圍內(nèi)有橋梁等對(duì)于工后位移有嚴(yán)格要求的結(jié)構(gòu)物,而常規(guī)“抗滑樁一般允許有較大的變形”,即使樁身承載能力達(dá)到要求也難以滿足工后位移的容許要求。本文針對(duì)這兩個(gè)問題,以實(shí)際工程實(shí)例為依托,在尋求更大承載能力、更小樁身位移的抗滑樁型式方面做出了嘗試和努力。通過三維數(shù)值模擬算例,詳細(xì)探討了門型樁的適用優(yōu)點(diǎn)、適用的工程環(huán)境、門型樁前后樁距與邊坡穩(wěn)定系數(shù)的關(guān)系、門型樁前后樁距與樁身應(yīng)力應(yīng)變的關(guān)系以及聯(lián)系梁結(jié)構(gòu)剛度對(duì)于樁身內(nèi)力的影響等。3、微型樁有常規(guī)大尺寸的抗滑樁不可比擬的某些優(yōu)勢(shì),在工程實(shí)踐中有較好的發(fā)展,但是對(duì)于微型抗滑樁的作用機(jī)理缺乏系統(tǒng)全面的認(rèn)識(shí),還沒有形成一種較為成熟的、廣為認(rèn)可的設(shè)計(jì)計(jì)算理論。本文通過詳細(xì)的三維數(shù)值算例,探討了微型樁群的樁徑、樁與潛在滑動(dòng)面的夾角、微型樁群的布置間距、布置方式等設(shè)計(jì)中的關(guān)鍵因素對(duì)于邊坡加固的影響。然后通過一個(gè)管樁加固運(yùn)營中的高速公路的塌陷滑移邊坡?lián)岆U(xiǎn)工程實(shí)例驗(yàn)證了微型樁在施工場(chǎng)地受限、擾動(dòng)受限、工期要求緊的特殊工點(diǎn)具有較好的使用效果。4、在結(jié)構(gòu)工程上,預(yù)應(yīng)力技術(shù)發(fā)展很成熟,而在巖土工程的支擋工程中,預(yù)應(yīng)力技術(shù)的使用較少。采用豎向樁身預(yù)應(yīng)力技術(shù),提高抗滑樁抗彎能力同時(shí)減少樁身截面尺寸,在邊坡抗滑樁設(shè)計(jì)工程中值得關(guān)注。此類研究文獻(xiàn)非常少,本文通過詳細(xì)的三維預(yù)應(yīng)力鋼筋混凝土數(shù)值模擬算例,按照工程設(shè)計(jì)慣用的配筋方法配筋,分析了預(yù)應(yīng)力鋼筋混凝土抗滑樁與常規(guī)鋼筋混凝土抗滑樁在樁身、預(yù)應(yīng)力鋼筋、主體受拉鋼筋、架立鋼筋、受壓側(cè)鋼筋的應(yīng)力應(yīng)變規(guī)律,以及兩者對(duì)于邊坡穩(wěn)定貢獻(xiàn)方面的差異。
[Abstract]:In view of the huge economic losses and personnel injuries caused by landslides, the use of anti slide piles to reinforce the slope is a commonly used engineering countermeasure, and new type of anti slide pile is constantly emerging. This paper summarizes the risk and harmfulness of the landslide disaster and the research progress of the anti slide pile in the treatment of landslide disaster, and puts forward and studies the present research. In view of the complexity of the design and calculation of anti slide pile, in view of the complexity of the interaction of anti slide pile and soil, it is difficult to consider the interaction between anti slide pile and soil for the common limit equilibrium calculation method commonly used in the anti slide pile engineering. In this paper, ABAQUS finite element software is applied to the slope of different types of anti slide piles to the slope. The three dimensional numerical simulation of the reinforcement effect is carried out. The stress and strain law of the slope and the pile body under the action of the sliding pile is summarized and analyzed. On this basis, the anti sliding mechanism and reinforcement effect of different pile types are discussed, and some innovative and useful conclusions are obtained, which provide the theoretical basis and stress and strain for the design of anti slide pile engineering. The main contents and innovation points of this paper are as follows: 1, it is difficult to consider the interaction between pile and soil in the design and calculation of conventional anti slide pile. Therefore, some simplified assumptions are made. In this paper, the interaction of pile and soil is considered, and the common 1.5m * 2m anti slide pile in practical engineering is taken as an example. After three dimensional numerical analysis, the distribution pattern of pile body pressure in the slope reinforcement project, the characteristics of the equivalent line of soil displacement and the relationship between the slope stability coefficient and the pile spacing, the key factors in the design of the pile top deforming, the plastic deformation of the slope, the internal force of the pile, the displacement of the pile body, and so on,.2, are encountered in the large, deep and gliding landslide. The conventional anti slide pile is often bent and has insufficient shear bearing capacity. There are bridges, such as bridges and other structures which have strict requirements for post work displacement in the scope of anti slide pile reinforcement, and the conventional "anti slide pile generally permits large deformation". Even if the bearing capacity of the pile is reached, it is difficult to meet the allowable requirements of post working displacement. This paper is aimed at these two problems. On the basis of practical engineering examples, a trial and effort has been made in the search for the type of anti slide pile with greater bearing capacity and smaller pile displacement. Through a three-dimensional numerical simulation example, the application advantages of the portal type pile, the applicable engineering environment, the relationship between the front and rear pile spacing of the gate type pile and the slope stability coefficient, the distance between the front and rear piles of the gate type pile and the pile are discussed in detail. The relationship between the stress and strain of the body and the influence of the stiffness of the connecting beam on the internal force of the pile, and so on,.3, the micro pile has some advantages unparalleled with the conventional large size anti slide pile, and has a good development in the engineering practice. However, the lack of a comprehensive understanding of the mechanism of the action mechanism of the micro anti slide pile has not formed a more mature and wide range. Through a detailed three-dimensional numerical example, this paper discusses the influence of the key factors in the design of the pile diameter, the angle between the pile and the potential sliding surface, the layout space of the micro pile group, the layout method and other key factors on the slope reinforcement. Then, the collapse slip of the highway in the operation is strengthened through a pipe pile. The example of the slope emergency project proves that the special work point of the mini pile is limited in the construction site, the disturbance is limited and the special work point required for the time limit has a good use effect.4. In the structural engineering, the development of the prestress technology is very mature, while in the retaining engineering of the geotechnical engineering, the prestress technology is less used. The vertical pile body prestress technology is adopted to improve the resistance. The anti bending capacity of the slide pile reduces the size of the cross section of the pile and is worthy of attention in the design of slope anti slide pile. The literature of this kind of research is very few. In this paper, a detailed numerical example of three-dimensional prestressed reinforced concrete is used to analyze the mixing of the prestressed concrete anti slide pile and the conventional steel bar in accordance with the reinforcement method used in the engineering design. The stress and strain law of the pile body, prestressed reinforcement, the main body of the reinforced bar, the stand bar, the reinforced bar, and the difference between the two sides to the slope stability.

【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU473.1

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