發(fā)布時(shí)間：2018-01-17 20:31

  本文關(guān)鍵詞：大面積堆載下橋梁樁基負(fù)摩阻力試驗(yàn)與數(shù)值分析　出處：《東南大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 吹填區(qū) 大面積堆載 數(shù)值模擬 負(fù)摩阻力 中性點(diǎn)

【摘要】：沿海地區(qū)主要通過(guò)吹填淤泥及泥沙進(jìn)行圍墾,由于吹填區(qū)域土質(zhì)較差,淤泥軟弱土層較厚,排水固結(jié)時(shí)間漫長(zhǎng),靈敏度高,強(qiáng)度低,在后期填土作用下,土體會(huì)產(chǎn)生很大的固結(jié)沉降,易對(duì)臨近橋梁基礎(chǔ)產(chǎn)生較大的負(fù)摩阻力,降低樁基承載力,增加橋梁的沉降。在沿海吹填及軟土地區(qū)因樁基負(fù)摩阻力過(guò)大導(dǎo)致嚴(yán)重的工程事故時(shí)有發(fā)生,造成后期補(bǔ)救措施成本較高。目前,國(guó)內(nèi)外對(duì)樁基在沿海吹填地區(qū)深厚軟土地質(zhì)條件下負(fù)摩阻力研究較少,特別是現(xiàn)場(chǎng)試驗(yàn)相關(guān)研究更少。所以,展開(kāi)吹填區(qū)后期填土對(duì)樁基承載特性影響的研究,具有非常重要的理論意義和工程實(shí)用價(jià)值。本文結(jié)合臺(tái)州灣大橋工程建設(shè),在箬橫段選取三根樁基進(jìn)行大面積堆載下橋梁樁基負(fù)摩阻力試驗(yàn),按照堆載方案要求堆載一定的面積和高度,模擬沿海吹填區(qū)域后期填上對(duì)橋梁樁基負(fù)摩阻力的影響,并結(jié)合不同理論方法計(jì)算進(jìn)行對(duì)比分析。同時(shí)采用數(shù)值模擬手段,利用巖土通用軟件FLAC 3D模擬實(shí)際堆載尺寸、模擬不同堆載面積、模擬不同堆載高度,分析不同工況條件下對(duì)橋梁樁基負(fù)摩阻力的影響。主要內(nèi)容和結(jié)論如下：(1)對(duì)臺(tái)州灣大橋箬橫段接線工程三根工程試樁進(jìn)行平衡堆載,近似模擬后期大面積填土對(duì)橋梁樁基的影響。試驗(yàn)在樁中埋設(shè)鋼筋計(jì),測(cè)試出樁身內(nèi)力,在樁頂及周?chē)乇砺裨O(shè)沉降標(biāo),測(cè)試樁頂及地表的沉降大小。進(jìn)行了為期三個(gè)月左右的長(zhǎng)期觀測(cè),現(xiàn)場(chǎng)實(shí)測(cè)結(jié)果表明,堆載高度達(dá)到4m高度時(shí),負(fù)摩阻力總和達(dá)到2687kN左右,中性點(diǎn)深度約為29.5m,且負(fù)摩阻力的發(fā)展是隨時(shí)間而變化的,在實(shí)際工程中應(yīng)充分考慮負(fù)摩阻力的影響。(2)利用Bjerrum建議方法、公路橋涵地基與基礎(chǔ)規(guī)范法、美國(guó)Garlanger等人建議方法、日本建筑基礎(chǔ)構(gòu)造設(shè)計(jì)規(guī)準(zhǔn)及層狀土迭代法等理論計(jì)算方法計(jì)算樁基的負(fù)摩阻力,計(jì)算結(jié)果表明,規(guī)范法計(jì)算出的總負(fù)摩阻力比實(shí)測(cè)值偏大,Bjerrum建議方法計(jì)算結(jié)果與實(shí)測(cè)結(jié)果較接近,可作為本地區(qū)類(lèi)似工程樁基負(fù)摩阻力設(shè)計(jì),而其他方法計(jì)算結(jié)果與實(shí)測(cè)結(jié)果差異較大。(3)利用FLAC 3D軟件模擬后期填土對(duì)橋梁樁基的影響,考慮到實(shí)際堆載面積及堆載高度有限,本文模擬了不同堆載面積及不同堆載高度范圍大小對(duì)橋梁樁基的影響。模擬堆載面積影響時(shí),結(jié)果表明,當(dāng)堆載面積較小時(shí),堆載面積增加對(duì)樁基負(fù)摩阻力增加較明顯；當(dāng)堆載面積較大時(shí),堆載面積增加對(duì)樁基沉降影響較顯著,樁端沉降也很大,但總負(fù)摩阻力增長(zhǎng)不明顯。與較大面積堆載尺寸比較,現(xiàn)場(chǎng)堆載試驗(yàn)的尺寸面積明顯存在局限性,產(chǎn)生的樁基負(fù)摩阻力以及中性點(diǎn)深度較小。模擬堆載高度影響時(shí),結(jié)果表明,隨著堆載高度的增加,樁基負(fù)摩阻力總和與樁基沉降出現(xiàn)非線性增長(zhǎng)。
[Abstract]:Coastal areas are mainly reclaimed by dredging silt and silt. Because of poor soil quality, thick soft soil layer, long time of drainage consolidation, high sensitivity and low strength, it is under the action of late fill. Soil will produce great consolidation settlement, easy to produce a large negative friction on the adjacent bridge foundation, and reduce the bearing capacity of pile foundation. Increase the settlement of bridges. In coastal fill and soft soil areas, the negative friction of pile foundation caused by serious engineering accidents, resulting in higher cost of remedial measures. At home and abroad, there are few researches on the negative friction resistance of pile foundation under the geological conditions of deep soft soil in coastal filling area, especially in the field test. Therefore, the research on the influence of the later filling on the bearing characteristics of pile foundation is carried out. Combined with the construction of Taizhou Bay Bridge, this paper selects three piles in the transverse section of Ruo to test the negative friction resistance of bridge pile foundation under large area of heaped load. According to the surcharge scheme required a certain area and height of the heaped load, the influence of the late loading on the negative friction of the bridge pile foundation is simulated in the coastal filling area. At the same time, the numerical simulation method is used to simulate the actual surcharge size by using the general software FLAC 3D, and the different surcharge area is simulated. Simulation of different heaped heights and analysis of the influence of different working conditions on the negative friction of bridge pile foundation. The main contents and conclusions are as follows: 1) balanced heaped load of three test piles in the Ruo transverse section of Taizhou Bay Bridge. The influence of large area fill on the bridge pile foundation was simulated approximately. The reinforcement meter was embedded in the pile and the internal force of the pile was tested and the settlement mark was laid on the top of the pile and the surrounding surface. The settlement of pile top and surface is measured. The long-term observation for about three months shows that the total negative friction is about 2687kN when the heap-load height reaches 4m. The depth of neutral point is about 29.5 m, and the development of negative friction is changing with time. The influence of negative friction should be fully considered in practical engineering. The method of foundation and foundation code for highway bridge and culvert, the method suggested by Garlanger et al., and the theoretical calculation method such as the criterion of design of building foundation in Japan and the iterative method of layered soil are used to calculate the negative frictional resistance of pile foundation. The calculation results show that the total negative frictional resistance calculated by the code method is larger than the measured value. The calculated results of Bjerrum's method are close to the measured results and can be used for the design of negative friction resistance of pile foundations in similar projects in this area. However, the difference between the calculated results of other methods and the measured results is quite large. (3) FLAC 3D software is used to simulate the influence of fill on the bridge pile foundation in the later stage, considering the limitation of the actual surcharge area and the height of the heaped load. In this paper, the influence of different surcharge area and different heaped height on bridge pile foundation is simulated. The result shows that when the surcharge area is small, the influence of heaped area on bridge pile foundation is simulated. The increase of surcharge area is more obvious to the negative friction resistance of pile foundation. When the surcharge area is larger, the increase of the surcharge area has a significant effect on the settlement of pile foundation, and the settlement of pile tip is also very large, but the total negative frictional resistance is not obvious. The size area of the field load test is obviously limited, the negative friction of pile foundation and the depth of neutral point are smaller. When the influence of the heaped height is simulated, the results show that with the increase of the heap-load height, the negative friction resistance of pile foundation and the depth of neutral point are smaller. The sum of negative friction resistance of pile foundation and the settlement of pile foundation show nonlinear growth.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U443.15

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