本文選題：水土分算與合算　切入點：水土共同作用系數(shù)　出處：《浙江大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,伴隨著城市化進程的不斷推進,地下空間得到了廣泛地開發(fā)利用,同時也產(chǎn)生了許多工程問題,需要在基坑設(shè)計理論方面進行進一步地完善。作用在基坑圍護結(jié)構(gòu)上的荷載的計算問題一直是進行基坑設(shè)計最為核心的課題,這就涉及到土力學(xué)的一個基本內(nèi)容：土壓力計算理論。本文在總結(jié)前人研究成果的基礎(chǔ)上,主要對黏性土基坑水土壓力計算、非極限主動土壓力計算以及開挖卸載引起的超固結(jié)土土壓力計算三個基本問題進行了理論研究,并通過已有的試驗結(jié)果和算例進行了驗證。 現(xiàn)有的基坑水土分算與合算方法只能計算極端情況下的水土壓力,適用性不強。本文基于黏性土的微觀結(jié)構(gòu),根據(jù)黏性土結(jié)合水要占據(jù)一定的孔隙體積從而影響孔隙水壓力的傳遞這一事實,提出了土水共同作用系數(shù)ξ的計算方法,統(tǒng)一了黏性土的兩套強度指標(biāo),推導(dǎo)了水土壓力的統(tǒng)一計算方法。算例分析表明,本文的統(tǒng)一算法能夠計算從無黏性土到黏性土的所有水土壓力,具有普遍適用性。 黏性土的非極限主動土壓力無論是試驗還是理論研究成果都很少。本文從黏性土的應(yīng)力莫爾圓出發(fā),推導(dǎo)了黏性土強度指標(biāo)內(nèi)摩擦角φ、黏聚力c隨墻體位移變化的計算公式。采用水平條分法得到了非極限主動土壓力,本文理論計算結(jié)果與已有的模型實驗結(jié)果基本吻合。 基坑開挖時,坑底墻前土體的土壓力是一個由卸載引起的超固結(jié)土的土壓力問題,涉及到土體的有效上覆壓力與超固結(jié)土強度指標(biāo)的取值等問題。本文根據(jù)土體開挖卸載的受力特點,提出了超固結(jié)土的有效上覆壓力和強度指標(biāo)的計算公式,修正了朗肯被動土壓力公式用于計算墻前被動土壓力,與傳統(tǒng)計算方法的計算結(jié)果進行對比表明,本文方法能夠改正傳統(tǒng)計算方法計算結(jié)果偏小的問題。
[Abstract]:In recent years, with the continuous progress of urbanization, underground space has been widely developed and utilized, and many engineering problems have emerged. The theory of foundation pit design needs to be further improved. The calculation of load acting on the retaining structure of foundation pit has always been the core of foundation pit design. This involves a basic content of soil mechanics: soil pressure calculation theory. Based on the previous research results, this paper mainly deals with the calculation of soil and water pressure of clay soil foundation pit. Three basic problems, namely, the calculation of non-limit active earth pressure and the calculation of overconsolidated earth pressure caused by excavation and unloading, are theoretically studied and verified by existing experimental results and examples. The existing methods for calculating soil and water in foundation pit can only calculate soil and water pressure in extreme cases, and are not applicable. This paper is based on the microstructure of clay soil. According to the fact that clay soil combined with water must occupy a certain pore volume and affect the transfer of pore water pressure, the calculation method of soil-water interaction coefficient 尉 is put forward, and two sets of strength indexes of clay soil are unified. The unified calculation method of soil and water pressure is deduced. The example analysis shows that the unified algorithm can calculate all soil and water pressure from non-clay soil to clay soil, and it has universal applicability. There are few experimental and theoretical results on the non-limiting active earth pressure of clay soil. In this paper, the stress moire circle of clay soil is studied. The formulas of internal friction angle 蠁 and cohesive force c of clay soil strength index with wall displacement are derived. The non-limiting active earth pressure is obtained by horizontal strip method. The theoretical calculation results are in good agreement with the experimental results of existing models. During excavation of foundation pit, the earth pressure of the soil in front of the pit bottom wall is an overconsolidated soil pressure problem caused by unloading. The effective overburden pressure of soil and the value of strength index of overconsolidated soil are concerned. According to the stress characteristics of excavation and unloading of soil, the formula for calculating effective overburden pressure and strength index of overconsolidated soil is put forward in this paper. The formula of Rankine's passive earth pressure is modified to calculate the passive earth pressure in front of the wall. The comparison with the traditional calculation method shows that this method can correct the problem that the calculation result of the traditional method is too small.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU432

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