【摘要】：鋼板樁由于具有強(qiáng)度高、隔水性能好、施工方便、經(jīng)濟(jì)環(huán)保等特點(diǎn)，經(jīng)常用于圍堰和基坑支護(hù)結(jié)構(gòu)中。近年來，鋼板樁被廣泛地應(yīng)用于截水抗?jié)B、基坑支護(hù)、橋梁圍堰、船塢建設(shè)、污水處理、市政工程等項(xiàng)目中。鋼板樁通過位于兩側(cè)的鎖口連接成樁墻進(jìn)行受力的。對(duì)于工程中應(yīng)用最廣泛的U型鋼板樁，其鎖口位于樁墻的中心線上，由于受到剪力，鎖口間發(fā)生相對(duì)滑移導(dǎo)致鋼板樁的剛度達(dá)不到組合樁墻的剛度，工程中把這種現(xiàn)象稱為“折減效應(yīng)”（Reduce ModulusAction）。 在以鋼板樁作為支護(hù)結(jié)構(gòu)的設(shè)計(jì)中，折減效應(yīng)導(dǎo)致支護(hù)結(jié)構(gòu)的變形和位移等計(jì)算無法得到準(zhǔn)確的結(jié)果，給鋼板樁支護(hù)結(jié)構(gòu)的設(shè)計(jì)和廣泛使用帶來了很大的困難，目前在這些方面還缺乏實(shí)質(zhì)性的研究和分析。因此對(duì)鋼板樁墻鎖口剪力的傳遞對(duì)鋼板樁抗彎特性的影響的研究，，有利于工程師更好的把握鋼板樁墻的受力特性，從而更好的發(fā)揮鋼板樁的優(yōu)勢(shì)，指導(dǎo)工程實(shí)踐。 本文利用組合梁知識(shí)對(duì)鋼板樁中性軸的移動(dòng)對(duì)慣性矩和截面模量的影響進(jìn)行了討論，得出了慣性矩和截面模量隨中性軸移動(dòng)的變化規(guī)律；利用有限元軟件Abaqus進(jìn)行了鋼板樁的數(shù)值實(shí)驗(yàn)，得到了在不同邊界（兩端簡(jiǎn)支、一端固支另一端簡(jiǎn)支）和不同鎖口狀態(tài)下（新樁墻、銹蝕的樁墻、填砂的樁墻）剛度隨位移的變化規(guī)律，當(dāng)兩端簡(jiǎn)支時(shí)剛度發(fā)揮比一端固支另一端簡(jiǎn)支時(shí)大，并且跨長(zhǎng)越大時(shí)最終發(fā)揮的剛度也越大；針對(duì)剛度和強(qiáng)度的變化特點(diǎn)，本文給出了剛度折減和強(qiáng)度折減的范圍；本文采用等效剛度的簡(jiǎn)化方法來考慮剛度的非線性變化對(duì)位移的影響，其計(jì)算結(jié)果與進(jìn)行非線性計(jì)算所得位移較為接近；最后本文模擬工程中抽水和安裝支撐的工況，得出了鋼板樁墻在不同工況下的剛度值，可為工程實(shí)踐提供參考。
[Abstract]:Steel sheet pile is often used in cofferdam and foundation pit support structure because of its high strength, good performance of water insulation, convenient construction, economic and environmental protection and so on. In recent years, steel sheet piles have been widely used in water interception and impermeability, foundation pit support, bridge cofferdam, dock construction, sewage treatment, municipal engineering and so on. The steel sheet pile is attached to the wall of the pile by means of a lock port located on both sides of the pile. For the most widely used U-shaped steel sheet pile in engineering, the locking mouth is located on the center line of the pile wall. Due to the shear force and the relative slip between the locking openings, the stiffness of the steel plate pile cannot reach the stiffness of the composite pile wall. In engineering, this phenomenon is called "reduction effect" (Reduce ModulusAction). In the design of steel sheet pile as supporting structure, the calculation of deformation and displacement of supporting structure caused by the effect of reduction can not get accurate results, which brings great difficulty to the design and widespread use of steel sheet pile supporting structure. At present, there is a lack of substantive research and analysis in these aspects. Therefore, the research on the influence of the transfer of locking shear force on the bending behavior of steel sheet pile is helpful for engineers to grasp the mechanical characteristics of steel plate pile wall better, so as to give full play to the advantages of steel plate pile and guide the engineering practice. In this paper, the influence of composite beam knowledge on the moment of inertia and cross-section modulus of steel plate pile is discussed, and the variation of inertia moment and cross-section modulus with neutral axis is obtained. The numerical experiments of steel sheet pile are carried out by using the finite element software Abaqus. The results show that under different boundary (two ends of simple support, one end of fixed support on the other end) and different locking states (new pile wall, corroded pile wall), The stiffness of sand-filled pile wall changes with displacement. When the two ends are simply supported, the stiffness is larger than that of the other end, and the greater the span length is, the greater the ultimate stiffness is. According to the variation characteristics of stiffness and strength, the range of stiffness reduction and strength reduction is given in this paper. In this paper, the simplified method of equivalent stiffness is used to consider the influence of nonlinear variation of stiffness on displacement. The calculated results are close to those obtained by nonlinear calculation. Finally, the stiffness of steel sheet pile wall under different working conditions is obtained by simulating the working conditions of pumping and installing support in the engineering, which can be used as a reference for engineering practice.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU473.1

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