本文關鍵詞： 管樁模型試驗 樁側壓力 摩阻力 土床制備 半解析半數值　出處：《石家莊鐵道大學》2015年碩士論文　論文類型：學位論文

【摘要】：現階段隨著高層、超高層建筑的發(fā)展應用,樁基礎在建筑結構中的應用越來越廣泛。由于采用靜壓法工藝施工成型的管樁具有易于保證和檢查的樁身質量,另外工程成本相對而言較低,且具有穩(wěn)定性好、沉降量少而均勻、承載力高、沉降速度低等良好特性,從而使其成為現代工程系統(tǒng)中十分重要的基礎形式。然而,目前對于管樁靜壓法施工時的研究尚不成熟,對于管樁的沉樁機理及其承載力研究相對于工程應用而言比較落后。在各個方面的研究中,單樁的貫入和靜載試驗是評定樁施工質量好否必不可少的檢驗方法,對其的研究也顯得尤為重要。由于相對于樁基現場足尺試驗,室內模型試驗具有易于控制的試驗工況和試驗的可重復性,且在經濟性方便相對于現場試驗有很大的優(yōu)越性,目前成為研究樁基沉樁及承載機理的非常重要的手段。為了分析靜壓管樁在沉樁過程中的樁身應力變化,探究靜壓法施工的樁基在沉樁及靜載過程中的相關機理。本文通過學習總結以前學者們的研究方法及相關成果,并吸取相關靜壓樁的模型試驗的經驗。然后使用一種樁基試驗測量的新方法來測量分析試驗中樁基應力應變數據,其彌補完善了傳統(tǒng)試驗的不足和缺點。本文主要做了以下幾方面的研究工作:針對本模型試驗要求,開發(fā)了一種土床制備裝置并進行了試驗標定,得出了制備不同密實度土床的試驗方法,制取的試驗土床可滿足試驗精度的要求。試驗運用一種新型的樁基試驗測量方法,通過在模型管樁內壁粘貼十字花溫度自補償式應變片測量樁身應變值,然后使用一種數值分析方法來將應變反算為管樁在壓入、靜載過程中的摩阻力、端阻力以及側壓力。并通過理論與有限元軟件建模分析驗證此試驗測試方法的可靠性,證明其在測量應用中表現匹配良好。利用自行設計的多功能靜力壓樁裝置,其包括模型樁裝置、加載裝置、數據采集系統(tǒng)等一套完整的設備。試驗中試驗加載與測試設備試運行良好,為室內模型試驗提供了良好的試驗基礎與環(huán)境。在一套可實現靜壓法壓樁的試驗設備基礎上,本文做了一系列的模型試驗。分為管樁的貫入和靜載試驗兩部分。通過應變信息采集系統(tǒng)全程測量并記錄了模型管樁在砂土中沉樁過程及靜載過程中的應力應變變化,對管樁的沉樁過程及靜載過程中樁身側壓力和摩阻力的變化規(guī)律進行了研究。
[Abstract]:At present, with the development and application of high-rise building and super high-rise building, pile foundation is more and more widely used in building structure. In addition, the engineering cost is relatively low and has good characteristics such as good stability, small and uniform settlement, high bearing capacity and low settlement speed, which makes it a very important basic form in modern engineering system. At present, the research on the static pressure method of pipe pile is not mature, and the research of pile sinking mechanism and bearing capacity of pipe pile is relatively backward compared with the engineering application. The penetration test and static load test of single pile is an essential test method to evaluate whether the pile construction quality is good or not, and the research on it is especially important. The indoor model test has the advantages of easy control and repeatability compared with the field test. At present, it has become a very important means to study pile driving and bearing mechanism of pile foundation. In order to analyze the stress change of static pressure pipe pile in the course of piling, This paper explores the mechanism of pile foundation under static pressure construction in the process of pile sinking and static loading. Then a new method of pile foundation test is used to measure and analyze the stress and strain data of pile foundation. It makes up for the shortcomings and shortcomings of the traditional test. The main research work in this paper is as follows: according to the requirements of the model test, a soil bed preparation device is developed and calibrated. The test method of preparing soil bed with different compactness is obtained, and the test soil bed can meet the requirement of test precision. A new method of pile foundation test and measurement is used in the experiment. The strain value of pile body is measured by sticking cross temperature self-compensating strain gauge into the inner wall of the model pipe pile, and then a numerical analysis method is used to calculate the strain back to the friction resistance of the pipe pile in the process of pressing in and static loading. The end resistance and lateral pressure. The reliability of the test method is verified by theoretical and finite element software modeling and analysis. It is proved that the test method matches well in the measurement and application. The self-designed multi-function static piling device is used. It includes a complete set of equipment, such as model pile device, loading device, data acquisition system and so on. It provides a good test foundation and environment for indoor model test. On the basis of a set of test equipment which can realize static pressure pressing pile, In this paper, a series of model tests have been done, which are divided into two parts: the penetration test and the static load test. The stress-strain changes of the model pipe pile in the process of piling and static loading are measured and recorded through the strain information collection system. The variation of lateral pressure and frictional resistance of pipe pile during piling and static loading are studied.
【學位授予單位】：石家莊鐵道大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU753.3

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