本文選題：吸入式組合樁 + 大尺度模型試驗�。� 參考：《太原理工大學》2017年碩士論文

【摘要】：隨著海洋開發(fā)不斷向深海進行,各種深海浮式結(jié)構(gòu)的安全、穩(wěn)定、高效的運行都離不開安全經(jīng)濟的系泊系統(tǒng),而錨泊系統(tǒng)的安全運行離不開牢固可靠的深水錨固結(jié)構(gòu)。吸入式組合樁是針對單體樁穩(wěn)定性、可調(diào)性較差這些缺點而應運而生,吸入式組合樁具備了單體樁所不具有的整體承載能力高的特點,還使組合樁的幾何尺寸變得符合施工原理,減少耗費的材料和樁體重量,最終提高運輸?shù)目尚行?降低工程的成本。吸入式組合樁的經(jīng)濟性和適應性將使其具有相對較高的工程應用上的可行性。本文將對不同的長徑比和樁間距在飽和砂質(zhì)土壤中吸入式組合樁的荷載性質(zhì)進行大尺度試驗分析,同時通過改變荷載作用角度,并結(jié)合了單樁的相關試驗,為今后的吸入式組合樁作為深水錨固結(jié)構(gòu)的設計和施工提供理論上的一些依據(jù)和技術上的相關支持。本文的試驗研究結(jié)果如下:在沉樁過程中,樁體受到的阻力隨著沉樁深度的增加呈現(xiàn)非線性增長,且貫入阻力增長速度也逐漸增大;組合樁受到的阻力與樁間距呈現(xiàn)負相關。在沉樁過程中,組合樁阻力與單樁阻力的比值隨著深度的增加而增加。本文根據(jù)沉樁過程地試驗數(shù)據(jù),并參考相關文獻提出單樁和組合樁沉樁阻力擬合計算方法。在本文中,將傳遞荷載的鋼索與水平面的夾角作為施加到樁體上的斜向荷載的荷載角。通過對斜向荷載作用下的組合樁的簡化力學模型分析得到的結(jié)論有:當施加到荷載點的荷載的角度較小時,組合樁在斜向荷載作用下主要表現(xiàn)處在水平方向上的位移,后仰效果不是很明顯。當荷載角度逐漸變大時,施加到組合樁上的力偶效果逐漸增強,組合樁在荷載作用下的后仰效果逐漸變得明顯;組合樁上任意點的位移是整體位移和組合樁變形的綜合結(jié)果,在計算組合樁局部點的位移時需要分析樁體的整體位移和樁體的局部變形,并且兩者之間存在相互影響的耦合作用。通過對試驗數(shù)據(jù)的分析得到的結(jié)論有:對組合樁簡化力學模型的分析結(jié)論得到了驗證;在不同的荷載角度的作用下,只通過單一點的位移監(jiān)測無法準確的判斷樁體是否達到極限荷載,因此在制定樁體基礎破壞時位移標準時應該將荷載角度因素考慮在內(nèi);組合樁受到極限荷載時的位移比較小,但是隨著荷載角度的增大,極限荷載時的位移量會逐漸增大;當組合樁的荷載作用點位于樁前腿2/3埋深時,且斜向荷載小于45°時,荷載角度越小,組合樁的極限荷載越大。試驗表明,通過測量記錄SAA系統(tǒng)各測量點的位置變化數(shù)據(jù)來計算樁體的位移變形,使的本試驗在試驗過程中能夠計算出除了露出土體表面的樁頭的位移變形,還能計算出埋入土體的樁體的位移變形,因此使試驗能夠計算得到更為全面的關于樁體位移變形的試驗數(shù)據(jù),為將來類似的相關研究提供借鑒依據(jù)。
[Abstract]:With the continuous development of the ocean to the deep sea, the safety, stability and efficient operation of various deep-sea floating structures can not be separated from the safe and economical mooring system, while the safe operation of the mooring system can not be separated from the solid and reliable deep-water anchoring structure. The suction composite pile comes into being in view of the shortcomings of single pile stability and poor adjustability. The suction composite pile has the characteristics of high overall bearing capacity which the single pile does not have. It also makes the geometric dimension of the composite pile conform to the construction principle, reduces the material and pile weight, improves the feasibility of transportation and reduces the cost of the project. The economy and adaptability of suction composite pile will make it more feasible in engineering application. In this paper, the load properties of inhaled composite piles with different ratio of length to diameter and pile spacing in saturated sandy soil are analyzed on a large scale. At the same time, by changing the loading angle and combining with the related tests of single pile, It provides some theoretical basis and technical support for the design and construction of suction composite pile as a deep water Anchorage structure in the future. The experimental results are as follows: in the process of pile-sinking, the resistance of pile body increases non-linear with the increase of pile-sinking depth, and the growth rate of penetration resistance increases gradually, and the resistance of composite pile is negatively correlated with pile spacing. In the process of pile sinking, the ratio of composite pile resistance to single pile resistance increases with the increase of depth. Based on the ground test data of pile-sinking process and referring to relevant literatures, a method for calculating the resistance of single pile and composite pile is proposed in this paper. In this paper, the angle between the transfer cable and the horizontal plane is taken as the load angle of the oblique load applied to the pile. Through the analysis of the simplified mechanical model of composite pile under oblique load, the conclusions are as follows: when the load angle applied to the load point is small, the displacement of composite pile under oblique load is mainly in horizontal direction. Backward effect is not very obvious. When the load angle becomes larger, the effect of couple applied to the composite pile is gradually enhanced, and the displacement of any point on the composite pile is the comprehensive result of the whole displacement and the deformation of the composite pile. It is necessary to analyze the global displacement of the pile and the local deformation of the pile when calculating the displacement of the local point of the composite pile, and there is a coupling effect between the two. The conclusions obtained from the analysis of the test data are as follows: the conclusion of simplified mechanical model of composite pile is verified, and under the action of different load angles, The displacement monitoring of a single point can not accurately judge whether the pile reaches the ultimate load or not, so the load angle factor should be taken into account in the formulation of the displacement standard when the pile foundation is destroyed, and the displacement of the composite pile subjected to the ultimate load is relatively small. However, with the increase of the load angle, the displacement of the ultimate load will gradually increase. When the load point of the composite pile is 2 / 3 of the buried depth of the pile front leg, and the oblique load is less than 45 擄, the smaller the load angle is, the greater the ultimate load of the composite pile is. The experiment shows that the displacement and deformation of pile body can be calculated by measuring and recording the position change data of each measuring point in SAA system, so that the displacement and deformation of pile head except the exposed soil surface can be calculated in this experiment. The displacement and deformation of pile embedded in soil can also be calculated, so that more comprehensive experimental data on displacement and deformation of pile can be obtained by the experiment, which provides a reference basis for similar related research in the future.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU473.1;P75

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