【摘要】：隨著建設行業(yè)的迅猛發(fā)展,由于鉆孔灌注樁基具有承載能力高、施工方便以及造價低的優(yōu)點逐漸成為主要的基礎(chǔ)形式,但受到施工工藝和技術(shù)水平的限制,這也導致了樁基礎(chǔ)中普遍存在難以清除的樁周泥皮。由于泥皮存在對樁承載力影響很大,因此分析泥皮強度對樁承載性狀的影響具有非常重要的實用價值。由于自平衡測樁法能解決傳統(tǒng)測樁基承載力檢測方法中存在的種種問題,因而在土木工程領(lǐng)域有廣泛的應用。本文結(jié)合自平衡測樁的方法研究了泥皮強度對樁承載力的影響。本文在前人研究的基礎(chǔ)上,運用理論分析和有限元數(shù)值模擬的方法,系統(tǒng)研究了樁周泥皮在自平衡測樁下對承載性狀的影響。本文主要工作及研究成果如下:1.本文對湖南省常德市一工程實例進行了樁的自平衡現(xiàn)場監(jiān)測分析。結(jié)果表明:58天自平衡的檢測結(jié)果與28天的結(jié)果相比,承載力提高了10.6%。2.建立樁-泥皮-土相互作用的ABAQUS有限元模型。通過折減樁—土接觸面系數(shù)來模擬泥皮強度的變化,以此來模擬樁周泥皮隨時間的變化,分析了泥皮強度變化對鉆孔灌注樁自平衡檢測下豎向極限承載力的影響。3.通過分析荷載與位移、樁側(cè)摩阻力、軸力等物理量的關(guān)系,得出了泥皮樁的承載機理及泥皮強度變化對承載力的影響,結(jié)果表明:隨著樁-土接觸面折減系數(shù)(泥皮強度)的增大,樁身滑動的臨界荷載也隨之增大;另外在相同荷載下,隨著折減系數(shù)的增大,樁-土接觸面的極限摩阻力也隨之增加,而樁身位移隨之減小。4.分析樁-土接觸面折減系數(shù)的變化與樁承載性能的關(guān)系,結(jié)果表明:折減系數(shù)與承載力的變化并非線性關(guān)系,隨著折減系數(shù)的增加,極限摩阻力、極限端阻力和極限承載力的增量逐漸減小。
[Abstract]:With the rapid development of construction industry, because of the advantages of high bearing capacity, easy construction and low cost, bored cast-in-place pile foundation has gradually become the main basic form, but is limited by construction technology and technical level. This also leads to the widespread existence of pile surrounding mud skin which is difficult to remove in pile foundation. Because the existence of mud has great influence on the bearing capacity of pile, it is of great practical value to analyze the influence of the strength of mud skin on the bearing capacity of pile. The self-balanced pile testing method can solve the problems existing in the traditional pile foundation bearing capacity testing method, so it has been widely used in the field of civil engineering. In this paper, the influence of mud skin strength on pile bearing capacity is studied by using self-balanced pile measurement method. Based on the previous studies, the influence of the mud skin around the pile on the bearing behavior of the self-balanced pile is systematically studied by using the theoretical analysis and the finite element numerical simulation method. The main work and research results of this paper are as follows: 1. In this paper, a project case in Changde City, Hunan Province, is analyzed by self-balanced field monitoring. The results show that the bearing capacity of the 58 days' self-equilibrium test is 10.60.2. higher than that of the 28-day 's. The Abaqus finite element model of pile-mud-soil interaction is established. The change of mud crust strength is simulated by reducing the coefficient of pile-soil contact surface to simulate the change of mud crust around pile with time. The influence of the change of mud crust strength on the vertical ultimate bearing capacity of bored pile under self-balance test is analyzed. By analyzing the relationship between load and displacement, pile side friction, axial force, the bearing mechanism of mud pile and the influence of the change of mud skin strength on the bearing capacity are obtained. The results show that the critical load of pile sliding increases with the increase of the reduction coefficient of pile-soil contact surface (mud skin strength), and with the increase of the reduction coefficient under the same load, The ultimate frictional resistance of the pile-soil interface also increases, and the displacement of the pile body decreases by .4. The relationship between the variation of the reduction coefficient of the pile-soil interface and the bearing capacity of the pile is analyzed. The results show that the change of the reduction coefficient and the bearing capacity is not linear, and with the increase of the reduction coefficient, the ultimate frictional resistance is not linear. The increment of ultimate end resistance and ultimate bearing capacity gradually decreases.
【學位授予單位】：湘潭大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU473.1

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本文編號：2135162