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  本文關鍵詞：大型堆煤軟土場地群樁基礎受力變形特性數(shù)值分析與安全性評價　出處：《大連海事大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 軟土地基 樁土相互作用 群樁基礎 堆載 真空預壓

【摘要】：隨著我國經(jīng)濟突飛猛進,在工業(yè)廠房、公路路堤、道橋、港口碼頭經(jīng)常出現(xiàn)堆載甚至超載的情況。在軟土地基中,樁基礎在堆載作用下不僅會產(chǎn)生側(cè)向位移,還將產(chǎn)生較大的附加彎矩,這對于樁基的自身受力情況以及上部結(jié)構(gòu)的安全使用產(chǎn)生安全隱患。因此,有必要研究軟土地區(qū)堆載作用下樁基的受力特性,評價其是否滿足穩(wěn)定性和承載力要求,并提出合理化建議。本文以馬來西亞BALINGIAN(2×300MW)燃煤電站儲煤場軟基處理為工程背景,基于大型通用有限元軟件ABAQUS,考慮樁土相互作用的影響,通過建立二維、三維有限元分析模型,對儲煤場群樁基礎的受力特性進行研究,在此基礎上進行參數(shù)化分析。具體研究內(nèi)容包括:(1)建立了軟土地基中堆煤場地群樁基礎簡化二維有限元分析模型,對無堆煤荷載作用和有堆煤荷載兩種工況下土體位移、樁基位移及內(nèi)力進行了系統(tǒng)分析,研究堆煤荷載對樁基變形及受力的影響規(guī)律,與實際情況對比確定建模的合理性。(2)結(jié)合施工勘測報告,選取三個典型斷面,建立二維和三維有限元模型,對軟土彈塑性本構(gòu)地基-線彈性和彈塑性群樁基礎的受力特性進行對比分析,并在此基礎上結(jié)合規(guī)范要求對群樁基礎的穩(wěn)定性做出合理性評價。(3)基于以上分析,選取最不利斷面,綜合考慮工程實際情況,以淤泥質(zhì)土層彈性模量作為參變量,研究其對群樁基礎受力及變形的影響規(guī)律,在此基礎上對真空預壓處理后地基中樁基承載力進行驗算,為相關工程的進一步設計與施工提供參考。
[Abstract]:With the rapid development of economy in our country, there is often overloading or overloading in industrial factory building, highway embankment, road bridge, port wharf. In soft soil foundation, pile foundation will not only produce lateral displacement under the action of surcharge. There will also be a larger additional bending moment, which will cause safety hidden danger for the pile foundation and the safety use of the superstructure. Therefore, it is necessary to study the mechanical characteristics of the pile foundation under the surcharge in soft soil area. To evaluate whether it meets the requirements of stability and bearing capacity, and to put forward reasonable suggestions. This paper takes the soft foundation treatment of coal storage yard of Malaysia BALINGIAN(2 脳 300MW coal power station as the engineering background. Based on the finite element software Abaqus and considering the influence of pile-soil interaction, a two-dimensional and three-dimensional finite element analysis model is established to study the mechanical characteristics of pile group foundation in coal storage yard. On the basis of this, parametric analysis is carried out. The concrete research contents include: 1) the simplified two-dimensional finite element analysis model of pile group foundation in pile yard and ground in soft soil foundation is established. The displacement of soil, displacement of pile foundation and internal force under two working conditions of coal load without pile and pile coal load are analyzed systematically, and the influence of pile coal load on deformation and force of pile foundation is studied. Compare with the actual situation to determine the rationality of the modeling. 2) combined with the construction survey report, select three typical sections, establish two-dimensional and three-dimensional finite element model. In this paper, the stress characteristics of elastic elastic and elastoplastic pile group foundation of soft soil are compared and analyzed. Based on the above analysis, the most unfavorable section is selected and the actual situation of the project is considered comprehensively. Taking the elastic modulus of silt soil as parameter, the influence of elastic modulus on the bearing capacity and deformation of pile group foundation is studied, and the bearing capacity of pile foundation after vacuum preloading treatment is checked. To provide reference for further design and construction of related projects.
【學位授予單位】：大連海事大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU473.1

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