發(fā)布時(shí)間：2019-01-03 15:09

【摘要】：陡坡地段橋梁樁基礎(chǔ)由于其所處環(huán)境的影響,力學(xué)特性與平坡樁基差距大,加之施工時(shí)常將棄渣直接棄于橋下,加劇橋梁下部結(jié)構(gòu)不均勻沉降;同時(shí)由于橋梁堆載的不穩(wěn)定性,在降雨、地震等的因素影響下易造成坡體滑動(dòng)等地質(zhì)災(zāi)害,對(duì)橋梁樁基功能的發(fā)揮及橋梁整體安全性構(gòu)成極大的威脅。為保障陡坡橋梁樁基功能的正常發(fā)揮及橋梁的整體安全性,對(duì)堆載滑動(dòng)下陡坡橋墩與樁基礎(chǔ)的力學(xué)特性及其工程技術(shù)進(jìn)行研究十分必要。本文在分析國(guó)內(nèi)外已有研究成果的基礎(chǔ)上,采用理論計(jì)算與三維數(shù)值仿真分析方法,分別建立分析模型,結(jié)合現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù),研究了堆載對(duì)陡坡橋梁橋墩及其樁基礎(chǔ)的影響。依托百色至靖西高速公路工程項(xiàng)目坡南嶺大橋,通過(guò)現(xiàn)場(chǎng)調(diào)研、監(jiān)測(cè),分析堆載滑動(dòng)對(duì)橋梁的影響及破壞類(lèi)型,并提出相應(yīng)的工程技術(shù),確保陡坡橋梁運(yùn)營(yíng)安全。論文研究發(fā)現(xiàn),堆載引起的坡體滑動(dòng)對(duì)陡坡橋墩及樁基礎(chǔ)受力變形特性影響明顯,內(nèi)外側(cè)墩柱及樁基礎(chǔ)、柱、樁系梁在堆載作用下的力學(xué)特性不完全相同,當(dāng)堆載坡體不穩(wěn)定時(shí),橋梁結(jié)構(gòu)易在拉力及彎矩的綜合作用下發(fā)生破壞。論文研究成果對(duì)確保依托工程坡南嶺大橋基礎(chǔ)的安全運(yùn)營(yíng)及維護(hù)起到了積極的指導(dǎo)作用,具有一定的理論和工程實(shí)用價(jià)值。
[Abstract]:Because of the influence of the environment of bridge pile foundation in steep slope section, the mechanical characteristics of bridge pile foundation differ greatly from that of flat slope pile foundation. In addition, the slag is often discarded directly under the bridge during construction, which intensifies the uneven settlement of the bridge substructure. At the same time, because of the instability of bridge load, it is easy to cause slope sliding and other geological disasters under the influence of rainfall and earthquake, which poses a great threat to the function of bridge pile foundation and the safety of the bridge as a whole. In order to guarantee the normal function of pile foundation of steep slope bridge and the overall safety of bridge, it is necessary to study the mechanical characteristics and engineering technology of pier and pile foundation under heap-load sliding. Based on the analysis of the existing research results at home and abroad, the theoretical calculation and three-dimensional numerical simulation methods are used to establish the analysis models respectively. Combined with the field monitoring data, the influence of surcharge on the pier of steep slope bridge and its pile foundation is studied. Based on Baise to Jingxi Expressway Project, this paper analyzes the influence and damage type of the bridge caused by heaped sliding through field investigation and monitoring, and puts forward the corresponding engineering technology to ensure the safety of steep slope bridge operation. In this paper, it is found that the slope sliding caused by the heaped load has obvious influence on the mechanical deformation characteristics of the pier and pile foundation on the steep slope, and the mechanical properties of the inside and outside pier column and pile foundation, the column and the pile system beam under the surcharge are not exactly the same. When the heaped slope body is unstable, the bridge structure is easily destroyed under the combined action of tension and bending moment. The research results of this paper play an active guiding role in ensuring the safe operation and maintenance of the foundation of the Po-Nanling Bridge relying on the project, and have certain theoretical and engineering practical value.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U443.15;U443.22

【共引文獻(xiàn)】

相關(guān)期刊論文 前2條

1 尹平保;趙明華;楊超煒;楊明輝;;復(fù)雜荷載下橫坡段橋梁樁基承載特性試驗(yàn)研究[J];土木工程學(xué)報(bào);2014年05期

2 李忠庚;徐金明;吳紅斌;;橋梁工程施工及運(yùn)營(yíng)對(duì)巖體邊坡穩(wěn)定性的數(shù)值分析[J];上海大學(xué)學(xué)報(bào)(自然科學(xué)版);2014年05期

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本文編號(hào)：2399550