本文選題：有限單元法 + 自適應(yīng)網(wǎng)格加密�。� 參考：《浙江大學(xué)》2013年碩士論文

【摘要】：土坡穩(wěn)定分析是巖土工程領(lǐng)域的重要課題之一,其主要分析方法有極限平衡法、極限分析法、強(qiáng)度折減有限元法等。近年來隨著有限元及計算機(jī)技術(shù)的不斷發(fā)展,有限元的各方面技術(shù)已經(jīng)廣泛應(yīng)用到土工問題的眾多領(lǐng)域當(dāng)中。其中網(wǎng)格的自適應(yīng)加密技術(shù)結(jié)合有限元的求解計算方式,相對于傳統(tǒng)的極限平衡求解方法,可以更為準(zhǔn)確的尋找到土坡的滑裂帶的位置已經(jīng)土體的安全系數(shù),在工程設(shè)計時為設(shè)計方提供的進(jìn)一步的技術(shù)支持。本文以大型通用有限元計算分析軟件ABAQUS作為平臺,通過分析一系列經(jīng)典的土工模型算例及土坡穩(wěn)定分析的工程實(shí)例,運(yùn)用自適應(yīng)網(wǎng)格加密技術(shù)結(jié)合有限單元法的計算手段,進(jìn)行數(shù)值模擬分析,并對模擬結(jié)果進(jìn)行了分析。 本文主要包括以下幾方面研究工作： (1)介紹了土坡穩(wěn)定分析的目的、意義以及土坡穩(wěn)定分析常用方法和相應(yīng)的優(yōu)缺點(diǎn),從而確立了本文自適應(yīng)網(wǎng)格加密結(jié)合有限元計算方法的重要性,結(jié)合近年來該領(lǐng)域的多項(xiàng)研究成果,將自適應(yīng)網(wǎng)格劃分技術(shù)應(yīng)用到工程當(dāng)中。 (2)將自適應(yīng)網(wǎng)格加密技術(shù)與ABAQUS軟件相結(jié)合,通過ABAQUS的Remeshing模塊的網(wǎng)格重劃分功能,在不同的土工模型中選取合適的誤差控制指標(biāo)變量,進(jìn)行自適應(yīng)網(wǎng)格劃分技術(shù)與有限元計算模式的結(jié)合,并得到更為精確的計算結(jié)果。 (3)針對經(jīng)典的土工數(shù)值模擬分析模型,例如邊坡穩(wěn)定,土體垂直開挖以及地基的極限承載力等算例進(jìn)行分析,將分析結(jié)果與傳統(tǒng)的理論解析解進(jìn)行比較,來進(jìn)一步說明在有限元的分析過程中,自適應(yīng)網(wǎng)格加密技術(shù)的合理性。 (4)選取杭州東城國際花園二期工程地下室施工基坑維護(hù)設(shè)計項(xiàng)目作為具體的工程實(shí)例進(jìn)行分析,將有自適應(yīng)網(wǎng)格加密結(jié)合ABAQUS有限元計算軟件結(jié)果與現(xiàn)行的設(shè)計軟件計算結(jié)果做對比,說明結(jié)合了自適應(yīng)網(wǎng)格加密后有限元計算的結(jié)果更為準(zhǔn)確和精密。
[Abstract]:Slope stability analysis is one of the most important topics in the field of geotechnical engineering. The main analysis methods include limit equilibrium method, limit analysis method, strength reduction finite element method and so on. In recent years, with the continuous development of finite element and computer technology, various aspects of finite element technology have been widely used in many fields of geotechnical problems. Compared with the traditional limit equilibrium method, the adaptive mesh encryption technique combined with the finite element method can more accurately find the safety factor of the soil in the slip zone of the soil slope. Provide further technical support to the designer at the time of engineering design. In this paper, a series of classical examples of geotechnical model and engineering examples of soil slope stability analysis are analyzed on the platform of ABAQUS, an adaptive mesh encryption technique combined with finite element method (FEM) is used. The numerical simulation analysis is carried out, and the simulation results are analyzed. This paper mainly includes the following aspects of research work: 1) the purpose and significance of slope stability analysis are introduced, as well as the common methods and advantages and disadvantages of slope stability analysis. The importance of adaptive mesh encryption combined with finite element method is established in this paper. Combined with many research achievements in this field in recent years, adaptive mesh generation technology is applied to engineering. 2) combining adaptive mesh encryption technology with ABAQUS software, selecting appropriate error control index variables in different geotechnical models through the grid re-division function of Remeshing module of ABAQUS. The adaptive mesh generation technique is combined with the finite element method, and more accurate results are obtained. (3) the classical geotechnical numerical simulation models, such as slope stability, vertical excavation of soil and ultimate bearing capacity of foundation, are analyzed, and the results are compared with the traditional analytical solutions. To further explain the rationality of adaptive mesh encryption in the finite element analysis process. 4) selecting the basement foundation pit maintenance design project of Hangzhou Dongcheng International Garden Phase II Project as a concrete engineering example to analyze, The results of finite element calculation with adaptive mesh encryption combined with ABAQUS are compared with those of the current design software. It is shown that the results of finite element calculation with adaptive mesh encryption are more accurate and accurate.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU43

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