本文選題：厚拋石基床 + 地基應力　； 參考：《天津大學》2007年碩士論文

【摘要】： 在現(xiàn)行規(guī)范中,重力式碼頭拋石基床應力的計算假定基床是剛性的,不考慮基床前、后方的土壓力,只考慮基床自重和基頂應力向下的傳播。隨著大型重力式碼頭拋石基床深度的不斷加深,基床前、后方的土壓力也在不斷的加大,現(xiàn)行規(guī)范這種計算方法與實際情況就可能存在較大的差異。本文通過系統(tǒng)的計算、研究,分析厚拋石基床前后方土壓力對基床內(nèi)應力分布的影響,根據(jù)有限元軟件PLAXIS計算出的應力分布規(guī)律,提出了更合理的改進計算方法。 首先,仍采用現(xiàn)行規(guī)范關于基床剛性的假設,并考慮基床前、后方的土壓力,提出一個新的計算公式,通過工程實例的理論計算比較,可以發(fā)現(xiàn),考慮、不考慮基床前、后方的土壓力對基床應力分布的影響是很大的,說明在基床較厚的情況下,不能忽略基床前、后方的土壓力。 其次,利用大型土工有限元軟件PLAXIS對工程實例進行數(shù)值模擬分析,總結基床內(nèi)部的應力分布規(guī)律,并通過模型參數(shù)的調(diào)整,討論基床內(nèi)部應力分布規(guī)律的影響因素。 最后,根據(jù)有限元模擬出的結果基床應力分布規(guī)律,并考慮基床前、后方的土壓力,理論推導出一種采用三個控制點的改進計算方法,并通過工程實例的計算,證明這種改進計算方法更能準確的反映基床應力的實際分布規(guī)律。 本文為完善重力式碼頭厚拋石基床的設計理論進行了深入的研究和大量的計算,并通過工程實例的計算比較,說明本文第五章提出的這套改進計算理論是具有一定的實用價值的。
[Abstract]:In the current code, the calculation of the stress of the parabolic bed of gravity wharf assumes that the base bed is rigid and the earth pressure in front and rear of the bed is not considered, but only the gravity of the base bed and the propagation of the stress on the top of the foundation are taken into account. With the deepening of the depth of the rubble bed in the large gravity wharf, the earth pressure in the front of the foundation bed and behind it is also increasing, so there may be a great difference between the present calculation method and the actual situation. In this paper, through systematic calculation and research, the influence of earth pressure on the stress distribution in the foundation bed is analyzed. According to the stress distribution law calculated by the finite element software PLAXIS, a more reasonable and improved calculation method is put forward. First of all, we still adopt the assumption of the rigidity of the foundation bed in the current code, and consider the earth pressure in front and rear of the foundation bed, and put forward a new calculation formula. Through the theoretical calculation and comparison of the engineering examples, we can find, consider, do not consider the front of the foundation bed. The influence of the earth pressure on the stress distribution of the base bed is very great, which indicates that the earth pressure in the front and back of the bed cannot be ignored when the bed is thicker. Secondly, the numerical simulation and analysis of engineering examples are carried out by using the large-scale geotechnical finite element software PLAXIS, and the stress distribution law in the base bed is summarized, and the influencing factors of the stress distribution law in the base bed are discussed by adjusting the model parameters. Finally, according to the result of finite element simulation and considering the earth pressure in front and rear of the bed, an improved calculation method using three control points is deduced theoretically, and the calculation is carried out through an engineering example. It is proved that the improved method can more accurately reflect the actual distribution of the stress in the base bed. In this paper, in order to perfect the design theory of gravity wharf's thick parabolic bed, the author has carried on the thorough research and the massive calculation, and through the engineering example computation comparison, It shows that the improved calculation theory proposed in the fifth chapter of this paper has certain practical value.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2007
【分類號】：U656.1

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本文編號：2041077