【摘要】：近年來，隨著我國基礎(chǔ)設(shè)施建設(shè)的高速發(fā)展，真空預(yù)壓，這種地基處理方式在軟土地區(qū)有了很廣泛的應(yīng)用。在我國沿海地區(qū)存在大量的軟土。實(shí)踐表明，真空預(yù)壓這種地基處理方法在軟土地基處理中有著諸多優(yōu)勢。真空預(yù)壓地基處理方法對(duì)沉降限制嚴(yán)格的工程，諸如港口、機(jī)場跑道、高速鐵路路基的施工非常適用。 隨著真空預(yù)壓地基處理方法的廣泛運(yùn)用，對(duì)于真空預(yù)壓作用機(jī)理的研究也更加的深入。但是，真空預(yù)壓的設(shè)計(jì)計(jì)算卻沒有一個(gè)統(tǒng)一的理論。目前，對(duì)于真空預(yù)壓地基變形的計(jì)算，大多數(shù)是仿照堆載預(yù)壓的方式。這種方法即是將真空預(yù)壓的摸下真空度等效為等效均布荷載作用的地基表面上，算出土層中的應(yīng)力分布，再利用分層總和法進(jìn)行計(jì)算。實(shí)踐表明，這種計(jì)算方法存在很大的誤差，需要引入一個(gè)經(jīng)驗(yàn)系數(shù)ψ s來減少這種誤差。而經(jīng)驗(yàn)系數(shù)的取值又有一定的隨機(jī)性并且得不到很好的總結(jié)。因此，當(dāng)前真空預(yù)壓地基的沉降計(jì)算有很大的缺陷，重新尋找一種能夠反映真空預(yù)壓作用機(jī)理的計(jì)算方法是十分必要的。 本文在前人工作的基礎(chǔ)上，進(jìn)行了如下方面的分析研究： （1）分析真空預(yù)壓的加固機(jī)理，并和堆載預(yù)壓的加固機(jī)理進(jìn)行比較，通過對(duì)比來總結(jié)現(xiàn)有的真空預(yù)壓設(shè)計(jì)計(jì)算理論所存在的問題； （2）根據(jù)真空預(yù)壓地基的變形機(jī)理，，提出真空預(yù)壓地基變形計(jì)算的彈性理論方法。該方法可計(jì)算出土層中任意點(diǎn)的應(yīng)力應(yīng)變，并推導(dǎo)出基于彈性理論的真空預(yù)壓變形計(jì)算的分層總合法； （3）在彈性理論的基礎(chǔ)上，利用MATLAB編寫相應(yīng)的計(jì)算程序，結(jié)合有關(guān)工程實(shí)例證明本文相關(guān)理論的可靠性，在此基礎(chǔ)上提出角點(diǎn)法。利用MATLAB編寫相關(guān)程序驗(yàn)證角點(diǎn)法是否可靠； （4）在角點(diǎn)法的基礎(chǔ)上，推導(dǎo)關(guān)于土體應(yīng)力的無量綱方程，并推導(dǎo)相應(yīng)的應(yīng)力系數(shù)、編制應(yīng)力表格實(shí)現(xiàn)本文分層總和彈性理論計(jì)算的實(shí)用化和簡便化，服務(wù)與工程設(shè)計(jì)計(jì)算。
[Abstract]:In recent years, with the rapid development of infrastructure construction and vacuum preloading, this method of foundation treatment has been widely used in soft soil areas. There is a large amount of soft soil in the coastal areas of our country. Practice shows that the method of vacuum preloading has many advantages in soft soil foundation treatment. The treatment method of vacuum preloading foundation is very suitable for the construction of roadbed of seaport, airport runway and high speed railway. With the extensive application of vacuum preloading foundation treatment, the study of vacuum preloading mechanism is more in-depth. However, the design and calculation of vacuum preloading does not have a unified theory. At present, the calculation of foundation deformation under vacuum preloading is based on surcharge preloading. In this method, the vacuum degree of vacuum preloading is equivalent to the equivalent uniform load on the surface of the foundation, the stress distribution in the soil layer is calculated, and the method of stratified summation is used to calculate the stress distribution. Practice shows that there is a large error in this method, and it is necessary to introduce an empirical coefficient 蠄 s to reduce the error. The value of empirical coefficient is random and can not be summarized well. Therefore, at present, the settlement calculation of vacuum preloading foundation has great defects, so it is very necessary to find a new calculation method which can reflect the mechanism of vacuum preloading. Based on the previous work, the following aspects are studied in this paper: (1) the mechanism of vacuum preloading is analyzed and compared with that of surcharge preloading. The existing problems of vacuum preloading design and calculation theory are summarized by comparison. (2) according to the deformation mechanism of vacuum preloading foundation, the elastic theory method of vacuum preloading foundation deformation calculation is put forward. This method can calculate the stress and strain at any point in the soil, and deduce the total layered method for the calculation of vacuum preloading deformation based on elastic theory. (3) on the basis of elastic theory, the corresponding calculation program is compiled by MATLAB. Combined with some engineering examples to prove the reliability of the related theory in this paper, a corner point method is put forward on the basis of it. Using MATLAB program to verify whether the corner method is reliable. (4) based on the corner point method, the dimensionless equation of soil stress is derived, and the corresponding stress coefficient is derived. A stress table is compiled to realize the practical and simple calculation of the layered summation elasticity theory, and to serve and calculate the engineering design.
【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)】：TU472

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