發(fā)布時間：2018-08-25 10:24

【摘要】：樁基礎(chǔ)在建設(shè)工程中廣泛使用,使得考慮樁基的水平承載力成為一種不可避免的趨勢。在某些工程中,水平荷載甚至已經(jīng)成為樁基礎(chǔ)設(shè)計的主要控制因素。相比豎向荷載作用下樁基承載力的研究,水平荷載作用下樁基的分析研究就顯得相對落后,尤其是動力荷載作用下樁基礎(chǔ)響應的研究就顯得更加的不足。此外,樁基的現(xiàn)場水平荷載實驗由于其成本高、操作復雜而在工程應用中受到限制。因此,將數(shù)值模擬運用于樁基受力過程中樁、土體的內(nèi)力和變形分析具有一定的理論意義和實際應用價值。 本文在檢索國內(nèi)外研究成果并進行系統(tǒng)分析的基礎(chǔ)上,采用理論分析和數(shù)值模擬相結(jié)合的研究方法對水平靜力荷載和動力荷載作用下樁基的受力性能進行了分析,利用有限元軟件模擬分析了荷載、土層、樁徑和樁長的變化對樁基的影響以及在不同形式的動力荷載作用下樁基響應。論文的主要工作和取得的成果如下： (1)利用(?)ABAQUS有限元軟件建立樁-土模型和樁-彈簧模型分別對試樁資料進行模擬分析,并與m法計算結(jié)果和實測資料進行對比,分析有限元模擬存在的誤差及產(chǎn)生原因。 (2)依次對荷載、土層、樁徑、樁長做出規(guī)律性的變化,以得到樁身位移、樁身彎矩、樁身剪力等響應,并將模擬結(jié)果與m法計算結(jié)果進行對比,得到了荷載、土層、樁徑、樁長對樁基的影響規(guī)律。對有限元模擬所得數(shù)據(jù)進行擬合,分析了擬合誤差。 (3)利用ABAQUS建立了樁-彈簧模型,并與m法、樁-土模型計算結(jié)果進行對比,分析了樁-彈簧模型的優(yōu)點及不足,研究了樁身位移、樁身彎矩、樁身剪力隨彈簧剛度的變化規(guī)律,進行了數(shù)據(jù)的擬合,分析了擬合誤差。 (4)模擬了在突加長期荷載、正弦荷載、沖擊荷載、地震荷載作用下樁基的響應,分析了不同的荷載作用形式對樁基內(nèi)力的影響及規(guī)律。 (5)模擬分析在地震荷載作用下,土層、樁徑、樁長的變化導致樁身的不同響應。并對不同情況下的樁身響應進行了對比分析。 (6)對比分析靜荷載和動荷載作用下土層、樁徑、樁長對樁基內(nèi)力的不同響應。
[Abstract]:Pile foundation is widely used in construction projects, which makes it an inevitable trend to consider the horizontal bearing capacity of pile foundation. In some projects, horizontal load has even become the main control factor of pile foundation design. Compared with the research of pile foundation bearing capacity under vertical load, the research of pile foundation analysis under horizontal load is relatively backward, especially the research of pile foundation response under dynamic load is more insufficient. In addition, the field horizontal load test of pile foundation is limited in engineering application due to its high cost and complex operation. Therefore, it is of theoretical significance and practical application value to apply numerical simulation to the analysis of the internal force and deformation of the soil in the course of pile foundation loading. On the basis of searching domestic and foreign research results and systematic analysis, this paper analyzes the mechanical behavior of pile foundation under horizontal static load and dynamic load by combining theoretical analysis and numerical simulation. The influence of load, soil layer, pile diameter and pile length on pile foundation and the response of pile foundation under different forms of dynamic load are simulated by finite element software. The main work and achievements are as follows: (1) the pile-soil model and pile-spring model are established by using ABAQUS finite element software, and the results are compared with the calculated results of m method and the measured data. The errors in finite element simulation are analyzed and the causes are analyzed. (2) regularly changing the load, soil layer, pile diameter and pile length in order to obtain the responses of pile displacement, pile bending moment, pile shearing force and so on. The influence of load, soil layer, pile diameter and pile length on the pile foundation is obtained by comparing the simulation results with the results of m method. The data obtained from finite element simulation are fitted, and the fitting error is analyzed. (3) the pile-spring model is established by using ABAQUS, and compared with the results of m method and pile-soil model, the advantages and disadvantages of pile-spring model are analyzed. The variation law of pile displacement, pile bending moment, pile shear force with spring stiffness is studied, and the fitting error is analyzed. (4) the long-term load, sinusoidal load, impact load are simulated. The response of pile foundation under earthquake load is analyzed, and the influence and regularity of different load forms on the internal force of pile foundation are analyzed. (5) under earthquake load, the variation of soil layer, pile diameter and pile length leads to different responses of pile body. The responses of pile body under different conditions are compared. (6) the different responses of soil layer, diameter and length of pile to the internal force of pile foundation under static and dynamic loads are analyzed.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU473.1

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本文編號：2202595