本文選題：擋土墻　切入點(diǎn)：庫(kù)侖土壓力理論　出處：《長(zhǎng)沙理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：庫(kù)侖土壓力理論至今仍是計(jì)算土壓力的主要方法之一,并在工程中廣泛應(yīng)用。然而,隨著土木工程科學(xué)的發(fā)展和對(duì)土木工程安全性要求的提高,傳統(tǒng)的土壓力理論已不能滿足土壓力問題的設(shè)計(jì)計(jì)算,對(duì)土壓力理論的研究一直是土木工程中的一個(gè)研究熱點(diǎn)。根據(jù)目前庫(kù)侖土壓力的研究現(xiàn)狀,本文從基本的力學(xué)方法和力學(xué)現(xiàn)象出發(fā),對(duì)庫(kù)侖土壓力的計(jì)算方法進(jìn)行了探討和研究。本文完成的研究工作如下：1.通過分析庫(kù)侖土壓力的墻后土楔體的受力特點(diǎn),特別是深入研究了土楔體與墻的作用力關(guān)系,對(duì)庫(kù)侖土壓力理論給出了一些修正。(1)認(rèn)為土楔體和擋土墻之間的作用力(也即定義的土壓力),并非一定要達(dá)到極限狀態(tài),所以不能確定土壓力的作用方向,但土壓力的作用方向必須在其允許的角度范圍之內(nèi)。 所以,本文研究認(rèn)為庫(kù)侖主動(dòng)土壓力為作用方向角度變化范圍內(nèi)的最大值,庫(kù)侖被動(dòng)土壓力為作用方向角度變化范圍內(nèi)的最小值。(2)對(duì)于墻后土楔體,本文認(rèn)為,墻體和土楔體是兩個(gè)不同物體,土楔體的形成是因?yàn)橥林挟a(chǎn)生有潛在破裂面,而原庫(kù)侖土壓力理論要求墻體與土之間也達(dá)到臨界狀態(tài)是不必要的。墻體對(duì)土楔體的作用力(即土壓力)實(shí)質(zhì)就是相當(dāng)于一物(墻)施加于另一物(土楔體)的力,即使土楔體滑動(dòng)了,兩物之間也并非要滑動(dòng)。(3)本文推導(dǎo)了修正的主動(dòng)土壓力計(jì)算公式,給出了被動(dòng)土壓力的近似計(jì)算方案。通過例題證明本文的計(jì)算結(jié)果與原庫(kù)侖理論有明顯不同。2.考慮傳統(tǒng)庫(kù)侖土壓力并不滿足力距平衡,本文開展了嚴(yán)格靜力平衡方法的庫(kù)侖土壓力計(jì)算方法的研究。(1)考慮墻后土楔體的靜力矩平衡條件下,推導(dǎo)了土壓力的解析公式。(2)通過建立不同類型的擋土墻模型,用Matlab編程對(duì)推導(dǎo)的表達(dá)式數(shù)值求解,得到擋土墻在不同的滑動(dòng)面坡角時(shí)對(duì)應(yīng)的土壓力大小,在土壓力的方向取值范圍之內(nèi)找到最大土壓力值,其對(duì)應(yīng)的角度即為滑動(dòng)面的位置。(3)根據(jù)分析的結(jié)果得到填土面坡角這一參數(shù)對(duì)土壓力計(jì)算結(jié)果的影響很大。3.采用有限元數(shù)值方法對(duì)工程實(shí)例和算例進(jìn)行模擬分析,并和傳統(tǒng)庫(kù)侖理論、修正方法和嚴(yán)格靜力平衡法計(jì)算所得出的結(jié)果進(jìn)行比較。結(jié)果表明,本文修正方法和嚴(yán)格靜力平衡法計(jì)算結(jié)果合理,說明了本文研究工作的理論與工程意義。
[Abstract]:Coulomb earth pressure theory is still one of the main methods to calculate earth pressure and is widely used in engineering. However, with the development of civil engineering science and the improvement of safety requirements of civil engineering, The traditional earth pressure theory can not satisfy the design and calculation of the earth pressure problem. The research on the earth pressure theory has been a hot research topic in civil engineering. According to the current research situation of Coulomb earth pressure, In this paper, the calculation method of Coulomb earth pressure is discussed and studied based on the basic mechanical methods and mechanical phenomena. The research work accomplished in this paper is as follows: 1. By analyzing the mechanical characteristics of the soil wedge behind the wall of Coulomb earth pressure, In particular, the relationship between the earth wedge and the wall is deeply studied, and some amendments to the Coulomb earth pressure theory are given. It is concluded that the interaction force between the soil wedge and the retaining wall (that is, the defined earth pressure) does not have to reach the limit state. Therefore, the direction of action of earth pressure cannot be determined, but the direction of action of earth pressure must be within the allowable angle range. For the soil wedge behind the wall, the wall and the soil wedge are two different objects, and the soil wedge is formed because of the potential rupture surface in the soil. It is unnecessary for the original Coulomb earth pressure theory to require a critical state between the wall and the soil. The wall force on the soil wedge is essentially equivalent to the force applied by one object (wall) to another (soil wedge). Even if the soil wedge slips, it is not necessary to slip between the two objects.) in this paper, a modified formula for calculating active earth pressure is derived. The approximate calculation scheme of passive earth pressure is given. It is proved by examples that the calculated results in this paper are obviously different from the original Coulomb theory. 2. Considering that the traditional Coulomb earth pressure does not satisfy the balance of force distance, In this paper, the Coulomb earth pressure calculation method of strict static equilibrium method is studied. 1) considering the static moment equilibrium condition of the soil wedge behind the wall, the analytical formula of earth pressure is derived. The derived expressions are solved numerically by Matlab programming, and the corresponding earth pressure of the retaining wall at different slope angles of sliding surface is obtained, and the maximum earth pressure is found within the range of the direction of the earth pressure. The corresponding angle is the position of the sliding surface.) according to the analysis results, the slope angle of the fill surface has a great influence on the calculation results of the earth pressure. The finite element numerical method is used to simulate the engineering examples and the calculation examples. The results obtained by the traditional Coulomb theory, correction method and strict static equilibrium method are compared. The results show that the results of the modified method and the strict static equilibrium method are reasonable. The theoretical and engineering significance of the research work in this paper is explained.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU432

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 楊雪強(qiáng);分層填土作用在擋土墻上的主動(dòng)土壓力[J];湖北工學(xué)院學(xué)報(bào);2001年01期

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本文編號(hào)：1592369