發(fā)布時(shí)間：2018-02-12 07:48

  本文關(guān)鍵詞： 剛性樁復(fù)合地基 極限承載力 基礎(chǔ)寬度 置換率 承載力發(fā)揮系數(shù)　出處：《廣州大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：剛性樁復(fù)合地基雖然在工程中得到廣泛應(yīng)用已久,但目前對設(shè)計(jì)理論和計(jì)算方法還是存在些不足。剛性樁復(fù)合地基承載力按規(guī)范采用特征值法計(jì)算,但特征值法難以反映地基最終的實(shí)際狀態(tài)。建筑樁基技術(shù)規(guī)范對樁基計(jì)算的是極限承載力,與復(fù)合地基承載力特征值不匹配。復(fù)合地基樁間土承載力發(fā)揮系數(shù)β沒具體取值方法,難以做到在不同地質(zhì)條件和不同基礎(chǔ)情況下給出對應(yīng)的β值。本文對剛性樁復(fù)合地基承載力進(jìn)行研究,并針對上述問題,提出一種剛性樁復(fù)合地基極限承載力計(jì)算新方法。該方法從穩(wěn)定的角度分析求解剛性樁復(fù)合地基的極限承載力,采用修正密度法對樁土相互作用進(jìn)行轉(zhuǎn)換,分別求樁間土發(fā)揮的極限承載力、樁的極限承載力�？紤]基礎(chǔ)的破壞模式分別計(jì)算整體滑動破壞、中線滑動破壞、自由滑動破壞三種破壞模式下的極限承載力。通過計(jì)算分析均質(zhì)地基、成層地基條件下,基礎(chǔ)寬度、置換率對剛性樁復(fù)合地基影響。指出:樁間土的極限承載力、復(fù)合地基的極限承載力與置換率的關(guān)系;隨基礎(chǔ)寬度的變化,復(fù)合地基達(dá)到極限承載力時(shí)其破壞模式也會發(fā)生變化;復(fù)合地基極限承載力、樁間土的極限承載力與基礎(chǔ)寬度的關(guān)系;基礎(chǔ)寬度和置換率對樁間土承載力發(fā)揮系數(shù)的影響;基礎(chǔ)埋深對復(fù)合地基承載力的影響。通過該承載力計(jì)算方法可以方便的計(jì)算加固區(qū)在加固前和加固后的樁間土部分極限承載力,以此可以針對具體地基給出具體樁間土承載力影響系數(shù)。采用該計(jì)算方法對現(xiàn)場足尺寸試驗(yàn)和現(xiàn)場工程案例進(jìn)行計(jì)算,將計(jì)算結(jié)果與試驗(yàn)結(jié)果、工程案例實(shí)際情況進(jìn)行對比,指出該計(jì)算方法與試驗(yàn)結(jié)果有較好的吻合度,能正確反映工程實(shí)際狀況。
[Abstract]:Although the rigid pile composite foundation has been widely used in engineering for a long time, there are still some shortcomings in the design theory and calculation method. The bearing capacity of rigid pile composite foundation is calculated by eigenvalue method according to the specification. However, the eigenvalue method can not reflect the ultimate actual state of the foundation. The ultimate bearing capacity of the pile foundation is calculated by the technical code of the building pile foundation. The bearing capacity of composite foundation is not matched with the characteristic value of bearing capacity. It is difficult to give the corresponding 尾 value under different geological conditions and different foundations. In this paper, the bearing capacity of rigid pile composite foundation is studied, and aiming at the above problems, A new method for calculating the ultimate bearing capacity of rigid pile composite foundation is presented, in which the ultimate bearing capacity of rigid pile composite foundation is calculated from the stability point of view, and the modified density method is used to transform the pile-soil interaction. The ultimate bearing capacity of the soil between the piles and the ultimate bearing capacity of the pile are calculated respectively. Considering the failure mode of the foundation, the whole sliding failure and the central line sliding failure are calculated respectively. The ultimate bearing capacity under three failure modes of free sliding failure is calculated and analyzed. The influence of foundation width and replacement rate on the composite foundation with rigid piles is analyzed by calculating and analyzing the ultimate bearing capacity of soil between piles. The relationship between ultimate bearing capacity and replacement rate of composite foundation, the failure mode of composite foundation when it reaches ultimate bearing capacity will change with the change of foundation width, the ultimate bearing capacity of composite foundation, the ultimate bearing capacity of composite foundation, The relationship between the ultimate bearing capacity of soil and the width of foundation, the influence of the width of foundation and replacement ratio on the coefficient of bearing capacity between piles; The influence of the depth of foundation on the bearing capacity of composite foundation can be used to calculate the ultimate bearing capacity of soil between piles before and after reinforcement. In this way, the influence coefficient of soil bearing capacity between concrete piles can be given according to the concrete foundation. The calculation method is used to calculate the field enough size test and the field engineering case, and the calculation results are compared with the test results and the actual situation of the engineering case. It is pointed out that the calculation method is in good agreement with the test results and can accurately reflect the actual situation of the project.
【學(xué)位授予單位】：廣州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU473.1

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