本文選題：錨板 + 粘土��； 參考：《天津大學(xué)》2014年碩士論文

【摘要】：極限承載力是描述錨板工作性能的一項(xiàng)重要參數(shù),而一個(gè)確定的、統(tǒng)一的錨板極限承載力確定方法是獲得可靠數(shù)據(jù)的前提,也是進(jìn)行對(duì)比分析的前提。目前國(guó)內(nèi)外研究者對(duì)錨板極限承載力的確定尚未有統(tǒng)一的方法,且已有的方法大多存在一定的不確定性和主觀(guān)性。本文調(diào)研收集了以往研究者的確定方法,通過(guò)系統(tǒng)對(duì)比分析,推薦以錨板完整上拔過(guò)程中最大載荷作為極限承載力,并結(jié)合大變形有限元數(shù)值技術(shù),研究錨板極限承載力。本文主要工作包括:首先,分析了兩類(lèi)典型的物理實(shí)驗(yàn)曲線(xiàn)和數(shù)值計(jì)算曲線(xiàn)。發(fā)現(xiàn)在試驗(yàn)中,隨著位移增大,載荷先增大后減小,而基于小變形有限元數(shù)值技術(shù)的計(jì)算結(jié)果無(wú)法合理反映這一現(xiàn)象,因此本文推薦應(yīng)用大變形有限元數(shù)值技術(shù)計(jì)算錨板完整拔出過(guò)程。目前主要有3類(lèi)大變形數(shù)值分析技術(shù):網(wǎng)格重劃分法,任意的拉格朗日-歐拉法(Arbitrary Lagrangian-Eulerian method,ALE),和耦合的歐拉-拉格朗日法(Coupled Eulerian-Lagrangian method,CEL)。通過(guò)對(duì)比,認(rèn)為CEL法較其它2種方法有克服網(wǎng)格畸變能力強(qiáng)、應(yīng)用方便的優(yōu)點(diǎn),因此本文采用CEL法進(jìn)行大變形計(jì)算。其次,采用已有的10種不同錨板極限承載力確定方法對(duì)兩類(lèi)典型的數(shù)值結(jié)果曲線(xiàn)進(jìn)行量化分析,指出各種方法的不足之處:不確定性、不唯一性和主觀(guān)性。結(jié)合物理實(shí)驗(yàn)曲線(xiàn),推薦使用最大載荷法作為錨板極限承載力確定方法。再次,采用基于CEL法的大變形有限元數(shù)值技術(shù)研究方形錨板在均質(zhì)土及線(xiàn)性土中的承載力,以及圓形錨板在線(xiàn)性土中的極限承載力。通過(guò)與試驗(yàn)結(jié)果對(duì)比,驗(yàn)證了CEL方法的有效性;在分析線(xiàn)性土中錨板的承載力時(shí),通過(guò)用戶(hù)自定義子程序,實(shí)現(xiàn)了線(xiàn)性土強(qiáng)度分布隨錨板拔出的變化;通過(guò)與試驗(yàn)對(duì)比線(xiàn)性土中錨板上拔至泥面過(guò)程中完整的位移-載荷曲線(xiàn),體現(xiàn)了CEL法模擬錨板在大位移條件下載荷響應(yīng)的出色能力。最后,將本文提出的錨板極限承載力確定方法結(jié)合基于CEL法的大變形有限元技術(shù)應(yīng)用于不同形狀錨板在無(wú)重均質(zhì)土及無(wú)重線(xiàn)性土的極限承載力分析。結(jié)果表明:隨著矩形錨板長(zhǎng)寬比增大,錨板極限承載力降低,臨界埋深增大;錨板在均質(zhì)土中的極限承載力普遍比線(xiàn)性土中要高;長(zhǎng)寬比大于6的矩形錨板可視作條形錨板;圓形錨板極限承載力比方形錨板極限承載力稍高。
[Abstract]:Ultimate bearing capacity is an important parameter to describe the working performance of anchor plate, and a definite and unified method of determining ultimate bearing capacity of anchor plate is the premise to obtain reliable data and to carry out comparative analysis. At present, researchers at home and abroad do not have a unified method to determine the ultimate bearing capacity of anchor plates, and most of the existing methods are uncertain and subjective. Through systematic comparison and analysis, it is recommended that the maximum load in the whole uplift process of anchor plate should be taken as the ultimate bearing capacity, and the ultimate bearing capacity of anchor plate should be studied by combining the finite element numerical technique of large deformation. The main work of this paper is as follows: firstly, two kinds of typical physical experimental curves and numerical calculation curves are analyzed. It is found that the load increases first and then decreases with the increase of displacement, but the calculation results based on the finite element technique of small deformation can not reasonably reflect this phenomenon. Therefore, it is recommended that the large deformation finite element numerical technique be used to calculate the complete pullout process of the anchor plate. At present, there are three kinds of large deformation numerical analysis techniques: grid redivision method, arbitrary Lagrangian Euler method arbitrary Lagrangian-Eulerian method, and coupled Euler-Lagrangian method and coupled Eulerian-Lagrangian method. Compared with the other two methods, the CEL method has the advantages of strong ability to overcome the grid distortion and convenient application. Therefore, the CEL method is used to calculate the large deformation in this paper. Secondly, ten existing methods for determining ultimate bearing capacity of anchor plates are used to quantitatively analyze two typical numerical result curves, and the shortcomings of these methods are pointed out: uncertainty, non-uniqueness and subjectivity. Combined with the physical experimental curve, the maximum load method is recommended as the method to determine the ultimate bearing capacity of the anchor plate. Thirdly, the bearing capacity of square anchor plate in homogeneous soil and linear soil and the ultimate bearing capacity of circular anchor plate in linear soil are studied by using large deformation finite element method based on CEL method. The validity of the CEL method is verified by comparing with the test results, and the variation of the strength distribution of the linear soil with the pulling out of the anchor plate is realized by the user-defined subroutine in the analysis of the bearing capacity of the anchor plate in the linear soil. By comparing the complete displacement-load curve between the anchor plate and the mud surface in the linear soil, the excellent ability of the CEL method to simulate the load response of the anchor plate under the condition of large displacement is demonstrated. Finally, the method of determining the ultimate bearing capacity of anchor plate proposed in this paper is applied to the analysis of ultimate bearing capacity of different shape anchor plates in weightless homogeneous soil and weightless linear soil with large deformation finite element method based on CEL method. The results show that with the increase of the ratio of length to width of rectangular anchor plate, the ultimate bearing capacity of anchor plate decreases and the critical buried depth increases, the ultimate bearing capacity of anchor plate in homogeneous soil is generally higher than that in linear soil, and the rectangular anchor plate with ratio of length to width greater than 6 can be regarded as strip anchor plate. The ultimate bearing capacity of circular anchor plate is slightly higher than that of square anchor plate.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU442;TU476

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本文編號(hào)：1833642