本文選題：擋土墻基礎(chǔ) + 極限平衡法　； 參考：《湘潭大學(xué)》2017年碩士論文

【摘要】：在國家經(jīng)濟(jì)高速發(fā)展的大背景下,工業(yè)化、城鎮(zhèn)化均在快速推進(jìn),諸多涉及到工業(yè)與民用建筑、道路和橋梁、港口等方面建設(shè)的規(guī)模和投入逐步加大,尤其是在丘陵地區(qū)的工程建設(shè)中,擋土墻是經(jīng)常使用的支擋結(jié)構(gòu),如何更好地提高擋土墻建造中建設(shè)投資的效益、保證工程質(zhì)量、改善建筑施工環(huán)境尤為重要。為了改善傳統(tǒng)擋土墻基礎(chǔ)承載性能,減少因地基承載性能不足、地基處理不當(dāng)而導(dǎo)致的擋土墻事故,更好地保障建筑施工的安全,本文在前人研究的基礎(chǔ)上,提出了帶環(huán)墩預(yù)制擋土墻基礎(chǔ),該型式基礎(chǔ)施工簡便、性能出眾、適用范圍十分廣泛,具有良好的市場前景。本文在國內(nèi)外研究的基礎(chǔ)上,通過理論與數(shù)值模擬相結(jié)合的研究方法,對帶環(huán)、墩預(yù)制擋土墻基礎(chǔ)的豎向承載性能和水平承載性能進(jìn)行了系統(tǒng)研究,主要研究內(nèi)容及成果如下:1.利用極限平衡法,深入分析了帶環(huán)、墩預(yù)制擋土墻基礎(chǔ)的結(jié)構(gòu)特點(diǎn)、受力機(jī)制、破壞模式,并提出帶環(huán)、墩預(yù)制擋土墻基礎(chǔ)的豎向極限承載力和水平極限承載力的計(jì)算方法。分析表明,帶環(huán)、墩預(yù)制擋土墻基礎(chǔ)明顯改善了傳統(tǒng)擋土墻基礎(chǔ)的承載性能,在豎向極限承載力和水平極限承載力比較中,該種基礎(chǔ)型式均要優(yōu)于傳統(tǒng)基礎(chǔ)。2.通過數(shù)值模擬的手段,分別建立板、帶方環(huán)、帶方墩、帶圓環(huán)、帶圓墩五種擋土墻基礎(chǔ)模型,系統(tǒng)分析了帶環(huán)、墩預(yù)制擋土墻基礎(chǔ)在不同加載方式、不同土質(zhì)下的承載性狀。數(shù)值計(jì)算結(jié)果表明,在粘土和砂土中,帶環(huán)、墩預(yù)制擋土墻基礎(chǔ)的承載性能均要優(yōu)于傳統(tǒng)板基礎(chǔ)。在豎向極限承載力和基礎(chǔ)沉降的的比較中:帶方環(huán)、方墩基礎(chǔ)性能最佳,帶圓環(huán)、圓墩基礎(chǔ)次之,板基礎(chǔ)最差;在水平極限承載力的比較中,性能從優(yōu)到劣依次是:帶方環(huán)基礎(chǔ)、帶圓環(huán)基礎(chǔ)、帶方墩基礎(chǔ)、帶圓墩基礎(chǔ)、板基礎(chǔ)。3.結(jié)合理論和有限元分析結(jié)果,對綜合性能最好的帶方環(huán)基礎(chǔ)提出了增大方環(huán)高度、減小方環(huán)厚度、增加方環(huán)外邊長三種優(yōu)化方案,并通過數(shù)值模擬進(jìn)行了驗(yàn)證計(jì)算。結(jié)果表明,三種措施均能夠有效提高帶方環(huán)基礎(chǔ)模型的承載性能。
[Abstract]:Under the background of the rapid development of the national economy, industrialization and urbanization are advancing rapidly. The scale and investment of many aspects related to industrial and civil construction, roads and bridges, ports, etc., are gradually increasing. Especially in the engineering construction in hilly areas, retaining wall is often used as a retaining structure. How to improve the efficiency of construction investment, ensure engineering quality and improve construction environment is particularly important. In order to improve the bearing capacity of traditional retaining wall foundation, reduce the accidents of retaining wall caused by insufficient bearing capacity of foundation and improper treatment of foundation, and better protect the safety of construction, this paper is based on the previous research. The prefabricated retaining wall foundation with ring piers is put forward. This type foundation is simple in construction, outstanding in performance, wide in application range and has a good market prospect. Based on the research at home and abroad, the vertical bearing performance and horizontal bearing performance of the foundation with ring and piers are studied systematically by the combination of theory and numerical simulation. The main research contents and results are as follows: 1. By using the limit equilibrium method, the structural characteristics, stress mechanism and failure mode of the foundation of precast retaining wall with ring and pier are deeply analyzed, and the calculation methods of vertical ultimate bearing capacity and horizontal ultimate bearing capacity of the foundation with ring and pier are put forward. The analysis shows that the bearing capacity of the traditional retaining wall foundation is improved obviously with ring and pier precast retaining wall foundation. In the comparison of vertical ultimate bearing capacity and horizontal ultimate bearing capacity, this foundation type is superior to traditional foundation. By means of numerical simulation, five kinds of retaining wall foundation models are established, such as plate, square ring, square pier, circular ring and circular pier, respectively. The bearing behavior of the foundation with ring and pier under different loading modes and different soil quality is analyzed systematically. The numerical results show that the bearing capacity of the foundation with ring and pier prefabricated retaining wall is better than that of the traditional plate foundation in clay and sand. In the comparison of vertical ultimate bearing capacity and foundation settlement: with square ring, square pier foundation is the best, circular pier foundation is second, circular pier foundation is the worst, plate foundation is the worst, in horizontal ultimate bearing capacity comparison, The order of performance from good to bad is: with square ring foundation, with square pier foundation, with round pier foundation, with plate foundation. Based on the results of theory and finite element analysis, three optimization schemes of increasing the height of the square ring, reducing the thickness of the square ring and increasing the outer side length of the square ring are proposed for the foundation with the best comprehensive performance. The results are verified and calculated by numerical simulation. The results show that the three measures can effectively improve the bearing capacity of the basic model with square ring.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU476.4

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