本文選題：豎井　切入點：側(cè)壓力　出處：《中南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：：土壓力的計算問題是巖土工程領(lǐng)域中三大重要的研究課題之一,在曲面擋土墻結(jié)構(gòu)得到的研究成果具有很好的應(yīng)用價值。本文在庫侖土壓力理論的基礎(chǔ)上對豎井等曲面結(jié)構(gòu)的側(cè)壓力計算理論作了進一步研究。 傳統(tǒng)的極限平衡理論忽略了相鄰微元體兩側(cè)的法向作用力,并運用的的是直線擋土墻理論進行研究的。對于豎井等圓弧形曲面結(jié)構(gòu)物,相鄰微元體兩側(cè)的法向作用力對土體的平衡有重要的影響。本文以庫倫土壓力理論和原方計算法為基礎(chǔ),考慮了豎井曲面形式和相鄰微元體兩側(cè)的法向作用力對土壓力計算的影響。選擇三維微扇形單元土體,進行受力分析,由靜力平衡條件,推導(dǎo)出了豎井側(cè)壓力計算的表達式。 結(jié)合三個計算實例,每個豎井選取不同的半徑和深度,結(jié)合數(shù)值模擬分析,得到了影響豎井側(cè)壓力的幾個因素。通過和本文推導(dǎo)公式的計算結(jié)果對比,二者結(jié)果基本吻合,證明了本文推導(dǎo)公式的正確性。通過對比不同半徑、不同深度、不同相對剛度下豎井的側(cè)壓力,得到以下結(jié)論： 1.由于豎井的曲面效應(yīng)影響,使得豎井側(cè)壓力計算值比兩種經(jīng)典計算方法偏小。因此,對于曲面結(jié)構(gòu)擋土墻,經(jīng)典理論計算方法不夠合理。 2.與常規(guī)土壓力不同的是,豎井側(cè)壓力大小隨著深度的增加,表現(xiàn)為非線性增大。 3.豎井側(cè)壓力與半徑有關(guān)。隨著半徑增大而增大,最終趨于一穩(wěn)定值。不同相對剛度對豎井側(cè)壓力影響不大。
[Abstract]:The calculation of earth pressure is one of the three important research topics in the field of geotechnical engineering. The research results obtained in curved retaining wall structure have good application value. Based on Coulomb earth pressure theory, the lateral pressure calculation theory of shaft and other curved structures is further studied in this paper. The traditional limit equilibrium theory ignores the normal forces on both sides of adjacent microelements, and applies the theory of linear retaining wall. The normal forces on both sides of adjacent microelements have an important effect on the balance of soil mass. This paper is based on the Coulomb theory of earth pressure and the original calculation method. Considering the influence of the surface form of shaft and the normal force on both sides of adjacent micro-element body on the calculation of earth pressure, the calculation expression of lateral pressure of shaft is derived by selecting three-dimensional micro-sector element soil mass and carrying out the force analysis by using the static equilibrium condition. Combined with three calculation examples, each shaft selected different radius and depth, combined with numerical simulation analysis, several factors affecting the lateral pressure of the shaft were obtained. By comparing the calculated results with the formula derived in this paper, the two results are basically in line with each other. It is proved that the formula is correct. By comparing the lateral pressure of the shaft with different radius, depth and relative stiffness, the following conclusions are obtained:. 1. Due to the influence of surface effect of shaft, the calculated value of lateral pressure of shaft is smaller than that of two classical methods. Therefore, the classical theoretical calculation method is not reasonable for curved surface retaining wall. 2. Different from the conventional earth pressure, the lateral pressure of the shaft increases with the depth of the shaft. 3. The lateral pressure of the shaft is related to the radius, which increases with the increase of radius, and eventually tends to a stable value. Different relative stiffness has little effect on the lateral pressure of the shaft.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U451;U455.8

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