本文選題：水平荷載 + 缺陷樁��； 參考：《廣西大學(xué)》2017年碩士論文

【摘要】：隨著現(xiàn)代工程建設(shè)領(lǐng)域不斷發(fā)展,高層建筑、大跨建筑、港口碼頭、邊坡岸堤等高要求的工程項目需要地基基礎(chǔ)具有較大的抗彎剪能力。樁基礎(chǔ)作為一種具有眾多優(yōu)點的深基礎(chǔ)型式,受到了廣泛應(yīng)用。在實際工程中,由于地質(zhì)、施工條件等因素影響,樁基礎(chǔ)容易出現(xiàn)缺陷問題。規(guī)范中,對樁身完整性進(jìn)行了判定和分類,對樁缺陷嚴(yán)重者不予使用。缺陷樁處理一般費工費時,找到合理的缺陷樁加間方法具有重要意義。本文結(jié)合水平荷載下樁承載理論和實際工程中缺陷加固案例,對缺陷樁產(chǎn)生原因、檢測方法、加固方法進(jìn)行歸納總結(jié),基于鋼管混凝十疊合柱承載理論,采用鋼管-注漿加固缺陷樁,模擬PRC管樁植樁加固法,對模型樁樁身受力變形進(jìn)行試驗研究。本文設(shè)計了一套缺陷加固模型樁試驗方案,在室內(nèi)完成了完整模型樁、缺陷模型樁、缺陷加固模型樁、完整內(nèi)配鋼管模型樁制作(共計4類13組試驗方案)并進(jìn)行對照試驗,試驗主要包括模型樁材料基本性質(zhì)試驗、模型樁樁身抗彎剪強(qiáng)度試驗。得出如下結(jié)論:缺陷位置和加載點位置相互關(guān)系對樁身承載力影響較大:三種缺陷位置下,缺陷模型樁樁身極限承載力分別為完整樁的24.92%,44.66%,73.77%。缺陷位置越靠近加載點,樁身承載力降低越多,缺陷位置越靠近約束端,樁身承載力降低越少,越接近于完整樁。缺陷樁加固后,樁身承載力基本得到恢復(fù):三種缺陷位置下,采用小直徑鋼管注漿加固后,模型樁樁身極限承載力分別達(dá)到完整樁的86.12%,102.19%,114.54%;采用大直徑鋼管注漿加固后,模型樁樁身極限承載力分別達(dá)到完整樁93.85%,117.87%,125.09%。對應(yīng)的樁身位移與缺陷樁相比有所增大,樁身結(jié)構(gòu)延性得到增強(qiáng);缺陷樁加固后,改變了缺陷樁破壞形態(tài),荷載傳遞得到部分恢復(fù);增大鋼管管徑,可以提高樁身承載力和增強(qiáng)樁身延性。本文基于某項目工程資料,對樁的水平靜載試驗進(jìn)行了數(shù)值模擬。采用PRC管樁植樁加固方法,得出了完整樁、缺陷樁、缺陷加固樁的相關(guān)承載性狀規(guī)律。得出如下結(jié)論:缺陷位置對樁身水平抗剪承載力影響較大:三種缺陷位置下,缺陷樁樁身水平承載力特征值分別達(dá)到完整樁的54.90%,91.37%,83.63%。缺陷出現(xiàn)在樁上部時,樁身水平位移較大,樁身水平荷載-位移曲線出現(xiàn)陡降段,樁基水平承載力降低較多:缺陷出現(xiàn)在樁身中部和下部時,樁基承載力降低較少。樁身出現(xiàn)缺陷時,樁身存在負(fù)向彎矩。最大彎矩值點隨缺陷位置下移而下移,數(shù)值增大;最大負(fù)彎矩值點隨缺陷位置下移而下移,數(shù)值減小;樁身彎矩與剪力曲線在缺陷位置上下呈反向增大和正向增大兩種趨勢;樁身剪力值在樁頂面附近達(dá)到最大值。缺陷樁加固后,樁身承載力得到較大的恢復(fù)。隨管樁置換面積增大,樁身承載力有所提高,樁身彎矩最大值隨置換面積比例增大而增大,當(dāng)置換面積比例達(dá)到35%后,樁身彎矩提升較小。樁身最大剪力值隨置換面積比例增大而有減小趨勢。
[Abstract]:With the continuous development of modern engineering construction, high building, large span architecture, port wharf, slope bank embankment and other high demand engineering projects need foundation foundation with large bending shear ability. Pile foundation has been widely used as a kind of deep foundation with many advantages. In practical engineering, due to geology, construction conditions, and so on In the norm, the pile integrity is judged and classified, and it is not used for those with serious pile defects. The defect pile treatment is usually time-consuming and time-consuming. It is of great significance to find a reasonable defect pile method. This paper combines the pile bearing theory with the horizontal load and the defect reinforcement case in the actual project. In this paper, the causes of the defect pile, the detection method and the reinforcement method are summarized. Based on the bearing theory of the ten steel pipe mixing column, the steel pipe grouting reinforcement defect pile is used to simulate the pile reinforcement method of the PRC pipe pile, and the experimental research on the deformation of the model pile is carried out. Complete model pile, defect model pile, defect reinforcement model pile, complete internal steel pipe model pile making (total 4 types of 13 groups of test schemes) and controlled test are carried out. The test mainly includes the basic properties test of the model pile material and the bending shear strength test of the model pile body. The following conclusions are drawn: the relationship between the position of the defect and the position of the loading point is the relationship between the position and the position of the loading point. The bearing capacity of the pile is greatly influenced: the ultimate bearing capacity of the pile body of the defect model pile is 24.92%, 44.66%, and the 73.77%. defect position is closer to the loading point, the more the bearing capacity of the pile body is reduced, the more the position of the defect is near the constraint end, the less the bearing capacity of the pile body is reduced, the more the pile body bearing capacity is reduced, the more the pile body bearing capacity is loaded, the bearing capacity of the pile body is bearing the bearing capacity of the three defects. The force is basically recovered: under the three defects, the ultimate bearing capacity of the model pile is 86.12%, 102.19%, 114.54% respectively after the grouting of small diameter steel pipe, and the ultimate bearing capacity of the model pile is reached to the pile body displacement and defect corresponding to the whole pile 93.85%, 117.87% and 125.09%. respectively. The pile body structure ductility is enhanced. After the defect pile is strengthened, the failure form of the defective pile is changed and the load transfer is partially restored. Increasing the pipe diameter can improve the bearing capacity of the pile and enhance the ductility of the pile. In this paper, a numerical simulation of the horizontal static load test of the pile is carried out based on a project engineering data. The PRC tube is used. The strengthening method of pile planting pile has obtained the related bearing behavior law of complete pile, defective pile and defect reinforcement pile. The following conclusion is drawn: the position of defect has great influence on the horizontal shear bearing capacity of pile body: under the three defects, the characteristic value of the horizontal bearing capacity of the defective pile is 54.90%, 91.37%, and 83.63%. defect appears in the upper part of the pile, respectively. When the horizontal displacement of the pile is larger, the horizontal load displacement curve of the pile is steep, and the horizontal bearing capacity of the pile foundation decreases more. When the defect appears in the middle and lower part of the pile, the bearing capacity of the pile foundation is reduced less. When the pile body is defective, the pile body has negative bending moment. The maximum bending moment point moves down with the position of the defect, the value increases and the maximum negative bending is increased. The moment point moves down with the defect position and decreases, and the pile body bending moment and shear curve are two trends in the position of the defect, and the pile body shear value reaches the maximum value near the top of the pile. The bearing capacity of the pile body is greatly restored after the defect pile is strengthened. The bearing capacity of the pile body is increased with the increase of the displacement area of the pipe pile. The maximum bending moment of the pile increases with the increase of the displacement area ratio. When the displacement area ratio reaches 35%, the pile body bending moment increases less. The maximum shear value of the pile body decreases with the increase of the displacement area ratio.
【學(xué)位授予單位】：廣西大學(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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