本文關(guān)鍵詞：樁筏基礎(chǔ)的優(yōu)化設(shè)計(jì)與研究　出處：《湖北工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 樁筏 彈性地基 樁和土的相互作用 沉降計(jì)算

【摘要】：樁筏基礎(chǔ)由于在控制沉降差方面有著獨(dú)特的優(yōu)點(diǎn),現(xiàn)已成為一般高層建筑中最常用的基礎(chǔ)型式。但在實(shí)踐中,由于缺乏樁和樁間土之間相互作用的合理計(jì)算公式,中國(guó)房屋建筑進(jìn)行樁筏基礎(chǔ)設(shè)計(jì)時(shí),計(jì)算仍采用簡(jiǎn)化算法,降低了樁間土對(duì)地基承載力的提高作用,相應(yīng)地增加了樁的數(shù)量和長(zhǎng)度,導(dǎo)致基礎(chǔ)承載力有較大的富余量,從而造成一定的經(jīng)濟(jì)建設(shè)浪費(fèi),但由于高層建筑樁筏基礎(chǔ)是一個(gè)十分復(fù)雜的系統(tǒng),它們共同作用的研究關(guān)聯(lián)到很多因素,基于此,對(duì)其工作機(jī)理的深入研究是非常有必要的。本文對(duì)現(xiàn)階段國(guó)內(nèi)外樁筏基礎(chǔ)的研究成果進(jìn)行了總結(jié),在對(duì)樁筏基礎(chǔ)的工作原理理解的基礎(chǔ)上,采用PKPM建立模型,模擬計(jì)算了多種工況下樁筏基礎(chǔ)的沉降情況。關(guān)于樁筏基礎(chǔ)的優(yōu)化設(shè)計(jì),本文主要是從控制沉降方面來(lái)進(jìn)行了理論和計(jì)算分析。主要內(nèi)容有:以一個(gè)實(shí)際工程為研究對(duì)象,用PKPM軟件中JCCAD模塊為計(jì)算工具,計(jì)算了樁筏基礎(chǔ)在不同布樁的條件下的沉降情況,并根據(jù)PKPM計(jì)算出的單樁最大反力值,以及筏板的實(shí)際沉降、筏板的配筋量這些方面,進(jìn)行了對(duì)比分析;然后用FLAC3D模擬了樁在實(shí)際土層中的受力情況,根據(jù)計(jì)算結(jié)果,可以在設(shè)計(jì)時(shí)適當(dāng)提高地勘所提供的單樁承載力特征值;最后依據(jù)理論、試驗(yàn)和數(shù)值分析的結(jié)果提出了改善樁筏基礎(chǔ)工作效率的優(yōu)化設(shè)計(jì)方法,即調(diào)整布樁方式。其中調(diào)整布樁方式主要包括改變樁長(zhǎng)、改變樁距、改變樁徑等等,并提出了根據(jù)上部荷載布置樁,并改變樁長(zhǎng)的一般布樁原則。綜上所述,本論文主要研究了高層建筑樁筏基礎(chǔ)的工作性狀進(jìn),結(jié)合數(shù)值分析以及模型試驗(yàn)得到最終的結(jié)論,同時(shí)提出變剛度調(diào)平設(shè)計(jì)的指導(dǎo)思想與原理,提煉出一套優(yōu)化樁筏基礎(chǔ)設(shè)計(jì)的方法,這對(duì)工程實(shí)用具有重要的借鑒意義。
[Abstract]:Because of its unique advantages in controlling settlement difference, pile-raft foundation has become the most commonly used foundation in general high-rise buildings, but in practice. Due to the lack of a reasonable formula for calculating the interaction between piles and soil between piles, the simplified algorithm is still used in the design of pile-raft foundation in Chinese housing buildings, which reduces the effect of increasing the bearing capacity of soil between piles on the foundation. The corresponding increase in the number and length of piles, resulting in a large surplus of foundation bearing capacity, resulting in a certain amount of economic waste, but because of high-rise building pile-raft foundation is a very complex system. The research of their interaction is related to many factors, based on which, it is very necessary to study the working mechanism. This paper summarizes the research results of pile-raft foundation at home and abroad at present. On the basis of understanding the working principle of pile-raft foundation, the model of pile-raft foundation is established by using PKPM, and the settlement of pile-raft foundation under various working conditions is simulated and calculated. The optimum design of pile-raft foundation is discussed. This paper mainly carries on the theory and the calculation analysis from the aspect of controlling the settlement. The main contents are as follows: take a practical project as the research object, use the JCCAD module in the PKPM software as the calculation tool. The settlement of pile-raft foundation under different pile distribution conditions is calculated, and the maximum reaction force of single pile calculated by PKPM, the actual settlement of raft plate and the reinforcement of raft plate are compared and analyzed. Then FLAC3D is used to simulate the bearing capacity of the pile in the actual soil layer. According to the calculation results, the characteristic value of bearing capacity of single pile can be improved properly in the design. Finally, based on the results of theoretical, experimental and numerical analysis, an optimal design method is proposed to improve the working efficiency of pile-raft foundation, that is, to adjust the layout of piles, which mainly includes changing the length of piles and changing the spacing of piles. Change pile diameter and so on, and put forward the general principle of pile layout according to the upper load and change pile length. In summary, this paper mainly studies the working behavior of pile raft foundation of high-rise building. Combined with numerical analysis and model test, the final conclusion is obtained. At the same time, the guiding idea and principle of variable stiffness leveling design are put forward, and a set of optimization method of pile-raft foundation design is refined. This is of great significance to engineering practice.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU47

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