【摘要】：隨著城市化進程的加快,地下結(jié)構(gòu)大量涌現(xiàn),雙排樁支護結(jié)構(gòu)作為一種懸臂式空間支護體系,以其施工快捷、抗側(cè)移剛度大等優(yōu)點,成為一種應(yīng)用廣泛的支護形式。然而雙排樁支護結(jié)構(gòu)的受力與變形較為復(fù)雜,目前對于該支護體系的理論分析還不完善,尤其是樁間土對雙排樁的作用還有待進一步的研究。本文在分析雙排樁計算理論的基礎(chǔ)上,運用有限元軟件ABAQUS建立雙排樁有限元模型,研究了樁間土流失與坑底土體變軟對雙排樁支護體系變形與受力的影響,并以工程實例為背景進行了進一步的驗證。本文的主要內(nèi)容如下:(1)分析了雙排樁支護結(jié)構(gòu)的計算理論。詳細闡述了五種具有代表性的計算方法的原理、特點及適用性;介紹了基于ABAQUS軟件的有限元法,對本構(gòu)模型的選取、樁土接觸問題的處理及基坑開挖工況的模擬等問題進行了分析。(2)建立考慮止水帷幕的三維有限元模型,分析了樁距、排距兩個方向上樁間土流失對雙排樁支護體系變形與受力的影響,可知樁距方向樁間土流失對排樁樁身側(cè)移和彎矩以及水泥土攪拌樁樁身側(cè)移的影響均很小,而排距方向樁間土流失對三者的側(cè)移和受力都有較大影響。同時,研究了排距方向樁間土流失率對雙排樁支護體系的影響。此外,建立二維有限元模型,研究了坑底土體變軟對雙排樁支護體系變形與受力的影響。(3)以天津某基坑工程為例,分析了實際工程中樁間土流失與坑底土體變軟對雙排樁變形產(chǎn)生的影響,驗證了本文所采用的有限元模型的適用性以及分析結(jié)果的合理性。
[Abstract]:With the acceleration of urbanization, underground structures have emerged in large numbers. As a cantilever space support system, double-row pile supporting structure has become a widely used support form because of its advantages of quick construction and large anti-lateral stiffness. However, the stress and deformation of the double-row pile supporting structure are more complex, so the theoretical analysis of the supporting system is not perfect, especially the effect of soil between piles on the double-row pile is still to be further studied. Based on the analysis of the calculation theory of double-row piles, the finite element model of double-row piles is established by using the finite element software ABAQUS, and the influence of soil loss between piles and soft soil on the deformation and force of double-row pile supporting system is studied. Further verification is carried out on the background of engineering examples. The main contents of this paper are as follows: (1) the calculation theory of double row pile supporting structure is analyzed. The principle, characteristics and applicability of five representative calculation methods are described in detail. The finite element method based on ABAQUS software is introduced. The selection of constitutive model, the treatment of pile-soil contact problem and the simulation of excavation conditions are analyzed. (2) the three-dimensional finite element model considering the waterproof curtain is established, and the pile spacing is analyzed. The influence of soil loss between piles on the deformation and force of double row pile support system in two directions shows that the soil loss between piles in the direction of pile spacing has little effect on lateral displacement and bending moment of pile body and lateral displacement of cement soil mixing pile. The soil loss between piles in the row direction has great influence on the lateral displacement and force. At the same time, the influence of soil loss rate between piles in the direction of row distance on the support system of double row piles is studied. In addition, a two-dimensional finite element model is established to study the effect of soft soil on the deformation and force of double-row pile supporting system. (3) A foundation pit project in Tianjin is taken as an example. The effects of soil loss between piles and soft soil on the deformation of double-row piles in practical engineering are analyzed. The applicability of the finite element model and the rationality of the analysis results are verified.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU473.1

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