本文關(guān)鍵詞： 黃土沖溝區(qū) 橋梁樁基礎(chǔ) 堆載作用 豎向承載特性 剪切位移法 數(shù)值仿真 人工智能優(yōu)化設(shè)計系統(tǒng)　出處：《長安大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：堆載作用下黃土沖溝區(qū)樁基礎(chǔ)受到樁身外側(cè)土體缺失效應(yīng)與堆載作用的耦合作用影響，使其荷載傳遞機理和承載特性變化規(guī)律極為復(fù)雜，國內(nèi)外研究對這方面關(guān)注較少，且我國相關(guān)的橋梁基礎(chǔ)設(shè)計施工規(guī)范尚未涉及堆載對沖溝區(qū)樁基礎(chǔ)的影響。本文在對堆載作用下黃土沖溝區(qū)公路橋梁樁基礎(chǔ)的實際工程情況進行調(diào)研的基礎(chǔ)上，通過理論分析計算、數(shù)值仿真試驗及人工智能優(yōu)化系統(tǒng)的建立，對黃土沖溝區(qū)樁基礎(chǔ)在堆載作用下承載特性進行研究，主要工作及成果有： 1.通過理論分析及數(shù)值仿真試驗得到影響堆載作用下沖溝區(qū)橋梁樁基礎(chǔ)承載特性的實質(zhì)是：堆載作用與樁側(cè)土體缺失效應(yīng)耦合作用引起的樁身兩側(cè)的樁周土體剪應(yīng)力-剪應(yīng)變關(guān)系不協(xié)調(diào)變化�；趦�(yōu)化的剪切位移法和多層土負摩阻力計算原理，給出了堆載作用下坡頂樁和坡中樁承載力-沉降量理論計算的解析解公式。 2.通過數(shù)值仿真試驗分析了堆載土層厚度、沖溝坡度、樁徑及樁長對不同樁位堆載作用下沖溝樁基礎(chǔ)的承載特性的影響，并針對每個影響因素給出相應(yīng)工程設(shè)計建議，得出相應(yīng)工程設(shè)計指導(dǎo)建議——設(shè)置合理樁長可以減小堆載給樁基礎(chǔ)承載力帶來的不利影響。 3.利用基于GA-BP神經(jīng)網(wǎng)絡(luò)預(yù)測模型針對堆載作用下沖溝區(qū)橋梁樁基礎(chǔ)進行優(yōu)化設(shè)計，，給出同時滿足承載力要求和堆載影響的合理樁長。研究成果將為堆載作用下黃土沖溝地區(qū)公路橋梁樁基礎(chǔ)的設(shè)計與施工奠定堅實的理論基礎(chǔ)。
[Abstract]:Pile foundation in loess gully area under surcharge is affected by the coupling effect of soil loss and surcharge on the outside of pile body, which makes the load transfer mechanism and load characteristic change law very complicated. Little attention has been paid to this aspect in domestic and foreign studies. The influence of pile load on pile foundation in gully area has not been covered in the relevant design and construction code of bridge foundation in China. This paper investigates the actual engineering situation of highway bridge pile foundation in loess gully area under the action of surcharge. Through theoretical analysis and calculation, numerical simulation test and the establishment of artificial intelligence optimization system, the bearing characteristics of pile foundation in loess gully area under the action of pile load are studied. The main work and results are as follows: 1. Through theoretical analysis and numerical simulation test, it is found that the essence of bearing characteristics of bridge pile foundation in gully area under the action of surcharge is:. The relationship between shear stress and shear strain on both sides of the pile caused by the coupling of the surcharge action and the soil loss effect on the side of the pile is not in harmony, which is based on the optimized shear displacement method and the calculation principle of the negative friction resistance of the multi-layer soil. An analytical formula for calculating the bearing capacity and settlement of the top pile and the pile in the slope under the action of heaped load is given. 2. Through the numerical simulation test, the influence of the thickness of the surcharge soil, the slope of the gully, the diameter of the pile and the length of the pile on the bearing characteristics of the pile foundation under different pile positions are analyzed. According to each influencing factor, the corresponding engineering design suggestion is given. It is concluded that setting reasonable pile length can reduce the adverse effect of pile load on the bearing capacity of pile foundation. 3. The optimization design of bridge pile foundation in gully area under surcharge is carried out by using the prediction model based on GA-BP neural network. The reasonable pile length which can satisfy both the bearing capacity requirement and the influence of heaped load is given. The research results will lay a solid theoretical foundation for the design and construction of highway bridge pile foundation in loess gully area under the action of heaped load.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U443.15

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