【摘要】：抗滑樁被廣泛使用在滑坡的治理中，大量工程實(shí)踐證實(shí)其主要依靠土拱效應(yīng)來(lái)阻擋樁間土體的滑出，進(jìn)而起到抗滑的效果。土拱效應(yīng)是土體產(chǎn)生不均勻變形，使得土體中主應(yīng)力向樁體發(fā)生偏轉(zhuǎn)的一種現(xiàn)象，樁后土拱效應(yīng)長(zhǎng)期以來(lái)為工程界所關(guān)注，特別是20世紀(jì)以來(lái)，關(guān)于土拱效應(yīng)的實(shí)測(cè)數(shù)據(jù)、模型試驗(yàn)和理論研究逐漸增多。在滑坡治理中，對(duì)于存在一個(gè)明確滑動(dòng)面且滑坡推力較大時(shí)，若設(shè)置一排抗滑樁則需很大的截面和樁長(zhǎng)，導(dǎo)致成本偏高或支擋結(jié)構(gòu)受力不合理，這時(shí)可以考慮采用雙排或多排抗滑樁進(jìn)行治理，而懸臂雙排樁是雙排抗滑樁中較為常見(jiàn)的一種，在切方滑坡和基坑支護(hù)中常常使用帶擋板懸臂雙排樁。目前對(duì)雙排抗滑樁的研究還處于探索階段，還沒(méi)有成熟的理論和實(shí)用設(shè)計(jì)方法，對(duì)其工作機(jī)理也不甚清楚，，而對(duì)懸臂雙排樁的研究就更加的少了，鑒于在實(shí)際工程中，帶擋板懸臂雙排樁被廣泛的使用，因此本論文依托重慶市百名工程技術(shù)高端人才計(jì)劃項(xiàng)目“懸臂式抗滑樁三維土拱效應(yīng)及其動(dòng)力災(zāi)變研究”（NO.0218002432010），通過(guò)室內(nèi)模型試驗(yàn)和數(shù)值分析對(duì)帶擋板懸臂雙排樁的三維土拱效應(yīng)進(jìn)行研究分析，主要工作及結(jié)論如下： （1）在查閱相關(guān)文獻(xiàn)的基礎(chǔ)上，綜述抗滑樁土拱效應(yīng)及其形成機(jī)理的研究現(xiàn)狀，總結(jié)分析了前人對(duì)土拱效應(yīng)的研究成果。 （2）設(shè)計(jì)懸臂樁室內(nèi)模型試驗(yàn)，試驗(yàn)重點(diǎn)對(duì)樁身應(yīng)變及其樁間土體的內(nèi)部應(yīng)力分布及樁周土拱效應(yīng)的作用程度進(jìn)行研究分析，分析了坡頂荷載和土體含水量對(duì)懸臂單排樁土拱效應(yīng)的影響；分析了坡頂荷載、排凈距和不同布樁方式對(duì)雙排懸臂樁土拱效應(yīng)以及前后排樁身內(nèi)力的影響，在本文試驗(yàn)?zāi)Ｐ椭�，懸臂雙排樁分為懸臂雙排平行樁和懸臂雙排梅花樁兩種不同的布置方式。 （3）利用大型通用有限元分析軟件ABAQUS對(duì)懸臂雙排樁進(jìn)行了數(shù)值計(jì)算，并將數(shù)值計(jì)算結(jié)果與室內(nèi)模型試驗(yàn)的分析結(jié)果進(jìn)行對(duì)比研究，探討前后樁樁排距、水平推力、擋板剛度對(duì)懸臂雙排樁土拱效應(yīng)和前后排樁身內(nèi)力的影響，并對(duì)懸臂雙排樁兩種不同的布樁方式進(jìn)行對(duì)比；并且與埋入雙排樁和帶連梁懸臂雙排樁進(jìn)行對(duì)比分析。
[Abstract]:The anti slide pile is widely used in the treatment of landslides. A large number of engineering practices have proved that it mainly relies on the soil arch effect to block the slippery soil between piles, and thus plays an anti slippery effect. The soil arch effect is a phenomenon of uneven deformation of the soil, which makes the main stress deflect to the pile body, and the soil arch effect after the pile has long been a project. Since twentieth Century, especially since twentieth Century, the model test and theoretical research on the measured data of the soil arch effect have increased gradually. In the treatment of landslides, if there is a clear sliding surface and the landslide thrust is large, if a row of anti slide piles is set up, a large section and pile length will be required, which leads to the high cost or the unreasonable force of the retaining structure. Double row or multi row anti slide pile can be considered, and cantilever double row pile is a common type of double row anti slide pile. Double row of cantilever pile with baffle is often used in the cutting side and foundation pit support. At present, the research on double row anti slide pile is still in the exploration stage, and there is no mature theory and practical design method. The mechanism is not very clear, but the research on the cantilever double row pile is less. In view of the practical engineering, the cantilever double row piles with baffles are widely used. Therefore, this paper relies on the "NO.0218002432010" of the "cantilever type anti slide pile three-dimensional soil arch effect and the dynamic catastrophe study" (NO.0218002432010). Through indoor model test and numerical analysis, the three-dimensional soil arching effect of cantilever double row piles with baffles is studied and analyzed. The main work and conclusions are as follows:
(1) on the basis of consulting relevant literature, the research status of soil arching effect and its forming mechanism of anti slide pile is summarized, and the predecessors' research results on soil arching effect are summarized and analyzed.
(2) an indoor model test of cantilever pile is designed. The experiment focuses on the analysis of the strain of pile body, the internal stress distribution of the soil and the effect degree of the soil arch effect on the pile, and analyzes the influence of the load of the slope top and the soil moisture on the soil arch effect of the cantilever single row pile, and analyzes the load of the slope top, the spacing distance and the different way of pile cloth. In this experimental model, the cantilever double row piles are divided into two different arrangement modes of cantilever double row parallel piles and cantilever double row of plum blossom piles in the experimental model.
(3) the cantilever double row pile is calculated by the large general finite element analysis software ABAQUS, and the numerical calculation results are compared with the analysis results of the indoor model test. The influence of the pile spacing, horizontal thrust and the stiffness of the baffle on the soil arch effect of the cantilever double row pile and the internal force of the front and rear piles is discussed, and the double row of cantilever row is also discussed. The pile is compared with two different pile arrangement methods, and is compared with the double row piles embedded with double row piles and cantilever beams with double beams.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU473.1

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