發(fā)布時(shí)間：2019-02-17 12:29

【摘要】：隨著深基坑及現(xiàn)代海運(yùn)業(yè)的發(fā)展，特別是基坑深度的增大及碼頭載貨量的增大和裝卸能力的提高，對(duì)承載力要求越來越高，將T型地下連續(xù)墻應(yīng)用于深基坑工程及大型碼頭的工程實(shí)例越來越多。而且同等截面面積的T型地下連續(xù)墻與圓樁、方樁相比，截面抗彎模量大，具有承受更大的豎向荷載與水平荷載，減小沉降以及墻體的水平位移等特點(diǎn)。但在以往的研究中主要針對(duì)矩形槽孔的研究，而T型超深連續(xù)墻的開挖穩(wěn)定性的規(guī)律性，在國內(nèi)外研究的比較少，所以對(duì)T型地下連續(xù)墻槽壁的穩(wěn)定性研究具有重要意義。對(duì)槽壁穩(wěn)定有著決定性影響的因素進(jìn)行控制，并對(duì)失穩(wěn)機(jī)理進(jìn)行分析，有助于提高對(duì)槽壁穩(wěn)定的認(rèn)識(shí)，，從而能更好地防止失穩(wěn)的發(fā)生，并能為相類似的工程提供有效的借鑒。 本文通過有限元分析揭示了T型地下連續(xù)墻槽壁的失穩(wěn)機(jī)理、其潛在滑動(dòng)面的位置及失穩(wěn)破壞模式。首先對(duì)不同T型尺寸的地下連續(xù)墻進(jìn)行對(duì)比分析，得出槽壁穩(wěn)定性及變形的變化趨勢，得出失穩(wěn)模式從翼緣邊處失穩(wěn)向陽角處失穩(wěn)的兩方向尺寸比值的臨界點(diǎn)。然后分析了在成槽開挖過程中，槽壁的穩(wěn)定性及變形受開挖深度的影響規(guī)律。最后分析泥漿重度、土層參數(shù)、施工荷載、含有軟弱層以及攪拌樁加固對(duì)槽壁穩(wěn)定及變形的影響及其規(guī)律，為T型地連墻施工提供借鑒。
[Abstract]:With the development of deep foundation pit and modern shipping industry, especially the increase of foundation pit depth, the increase of wharf loading capacity and the improvement of loading and unloading capacity, the demand for bearing capacity is becoming higher and higher. There are more and more examples of T-type underground diaphragm wall used in deep foundation pit engineering and large wharf engineering. Compared with circular pile, T-shaped diaphragm wall with the same cross-sectional area has higher flexural modulus and higher vertical and horizontal load, reducing settlement and horizontal displacement of wall, etc. However, in the previous research, the research of rectangular slot hole is mainly focused on, but the regularity of excavation stability of T-type ultra-deep continuous wall is less studied at home and abroad, so it is of great significance to study the stability of T-type underground continuous wall groove wall. Controlling the factors that have decisive influence on the stability of the groove wall and analyzing the mechanism of the instability will help to improve the understanding of the stability of the groove wall and thus prevent the occurrence of the instability better and provide effective reference for similar projects. In this paper, the mechanism of instability, the location of potential sliding surface and the failure mode of T-shaped diaphragm wall are revealed by finite element analysis. In this paper, the stability and deformation trend of grooving wall are obtained by comparing and analyzing the underground continuous wall with different T shape sizes, and the critical point of the ratio of the two dimensions of instability mode from flange edge to positive angle is obtained. The stability and deformation of the groove wall are influenced by the depth of excavation in the process of trench excavation. At last, the influence and law of mud thickness, soil parameters, construction load, soft layer and mixing pile on the stability and deformation of groove wall are analyzed, which can be used for reference in the construction of T-type ground connecting wall.
【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)】：TU476.3

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