本文關(guān)鍵詞： 基坑支護(hù) 雙排樁 受力變形 基坑監(jiān)測 數(shù)值模擬　出處：《中國礦業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：雙排樁支護(hù)結(jié)構(gòu)由于抗彎剛度大、施工靈活等特點(diǎn)，逐漸在城市基坑支護(hù)中得到廣泛應(yīng)用。目前，對三角形布置的雙排樁支護(hù)結(jié)構(gòu)的設(shè)計(jì)方法尚不明確，故本文以徐州云龍觀邸基坑工程為背景，在前人研究成果的基礎(chǔ)上，，采用理論計(jì)算、實(shí)測分析與三維數(shù)值模擬方法，對三角形布置的雙排樁進(jìn)行了較為系統(tǒng)的研究，主要成果與結(jié)論如下： （1）總結(jié)了前人對雙排樁支護(hù)結(jié)構(gòu)的計(jì)算方法及土壓力作用理論，并研究了雙排樁在不同排距及樁間距下的土壓力變化規(guī)律，確定土壓力分布形式，通過結(jié)構(gòu)力學(xué)理論求出樁體水平位移，對雙排樁進(jìn)行理論計(jì)算分析，并驗(yàn)證數(shù)值模擬的合理性。 （2）建立了雙排樁三維計(jì)算模型，深入分析了不同排距、樁間距、嵌固深度、樁徑對雙排樁支護(hù)結(jié)構(gòu)受力變形的影響及不同排距、樁間距下樁間土的土拱效應(yīng)，明確了雙排樁設(shè)計(jì)中參數(shù)的合理取值范圍；并對不同土體c、φ值下的雙排樁受力變形進(jìn)行了分析，得出了c、φ值的不利范圍；此外，對帶撐雙排樁及加錨桿的雙排樁進(jìn)行了分析，結(jié)果表明，在帶撐或加錨桿情況下，雙排樁的受力形式更加合理，彎矩及變形得到了良好的控制。 （3）總結(jié)了雙排樁的設(shè)計(jì)及施工要點(diǎn)，并通過現(xiàn)場監(jiān)測數(shù)據(jù)，對樁體水平位移、冠梁位移、道路及建筑物沉降進(jìn)行了分析，得出了樁體及土體隨基坑開挖的變化規(guī)律以及對周邊環(huán)境的影響程度，支護(hù)效果證明了雙排樁支護(hù)結(jié)構(gòu)在控制基坑變形方面的合理性。 （4）以實(shí)際工程為背景，建立了數(shù)值分析模型，將實(shí)測數(shù)據(jù)與計(jì)算結(jié)果進(jìn)行對比，變形趨勢及數(shù)量級基本一致，證明了數(shù)值模擬的合理性；同時(shí)，提出了基坑的優(yōu)化設(shè)計(jì)方案，將內(nèi)支撐方案改為雙排樁支護(hù)形式，模擬結(jié)果表明雙排樁在位移控制方面比較理想，雖然位移控制能力小于內(nèi)支撐方案，但從施工、工期等角度考慮，采用雙排樁方案更為有利。
[Abstract]:The double-row pile supporting structure has been widely used in the city foundation pit support because of its large bending stiffness and flexible construction. At present, the design method of the triangular double-row pile supporting structure is not clear. Therefore, based on the foundation pit engineering of Yunlong Mansion in Xuzhou, based on the previous research results, this paper adopts theoretical calculation, measured analysis and three-dimensional numerical simulation method. A systematic study of the triangular double-row piles is carried out. The main results and conclusions are as follows: 1) the paper summarizes the calculation method of double-row pile supporting structure and the theory of earth pressure, and studies the variation law of earth pressure of double-row pile under different row spacing and pile spacing, and determines the distribution form of earth pressure. The horizontal displacement of the pile is calculated by the structural mechanics theory, and the theoretical calculation and analysis of the double-row pile are carried out, and the rationality of the numerical simulation is verified. (2) the three-dimensional calculation model of double-row piles is established, and the influence of different row spacing, pile spacing, embedded depth, pile diameter on the deformation of double-row pile supporting structure and different row spacing are analyzed. The soil arch effect of soil between piles under pile spacing, and the reasonable value range of the parameters in the design of double-row piles are determined. The deformation of double-row piles under different soil C and 蠁 values is analyzed, and the disadvantage range of c and 蠁 values is obtained. In addition, the analysis of double-row piles with bracing and bolting is carried out. The results show that the force forms of double-row piles are more reasonable and the bending moment and deformation are well controlled under the condition of braced or bolted piles. The main points of design and construction of double-row piles are summarized, and the horizontal displacement of pile, displacement of crown and beam, settlement of roads and buildings are analyzed through field monitoring data. The variation law of pile and soil with excavation and the degree of influence on surrounding environment are obtained. The supporting effect proves the rationality of double-row pile supporting structure in controlling foundation pit deformation. (4) based on the actual engineering background, the numerical analysis model is established, and the measured data are compared with the calculated results. The deformation trend and order of magnitude are basically consistent, which proves the rationality of the numerical simulation. At the same time, the optimization design scheme of foundation pit is put forward, which changes the internal support scheme into the double-row pile support form. The simulation results show that the displacement control of double-row piles is ideal, although the displacement control ability is smaller than that of the internal support scheme. However, it is more advantageous to adopt double row pile scheme from the point of view of construction and time limit.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU473.1

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