本文選題：擋土墻 + 有限填土路基��； 參考：《鄭州大學(xué)》2014年碩士論文

【摘要】：在公路建設(shè)中，受地形條件的限制會不可避免地修建半填半挖路基。為了保證半填半挖路基的穩(wěn)定性，往往需要修建路基擋土墻。擋土墻設(shè)計中關(guān)鍵的問題是土壓力的計算，其合理與否將直接影響到公路的安全性。半填半挖路基擋土墻后填土屬于有限填土，其作用在擋土墻上的壓力屬于有限土體的壓力。目前在擋土墻的設(shè)計中一般計算有限填土的主動土壓力，但是對于有限填土要達到主動土壓力需要一定的位移條件，而實際工程中有些擋土墻并沒有產(chǎn)生足夠的位移使有限填土達到主動土壓力狀態(tài)。對于有限填土主動土壓力的計算，按照目前規(guī)范中的方法只能求得有限填土對擋土墻的合力，而不能明確有限填土主動土壓力沿墻背的分布。庫倫土壓力理論假設(shè)填土對擋土墻土壓力的分布為直線分布，但是一些實測結(jié)果表明填土對擋土墻土壓力沿墻背的分布并非如此。本文的主要研究內(nèi)容為： 1.基于已激發(fā)內(nèi)摩擦角的概念，通過對擋土墻后填土應(yīng)力莫爾圓的分析，建立半無限填土路基對擋土墻靜止土壓力的計算方法，考慮擋土墻背和基巖開挖面的影響，建立有限填土路基對擋土墻靜止土壓力的計算方法，并與規(guī)范中主動土壓力的計算方法進行對比。針對不同接觸面摩擦系數(shù)的各種情況，分別建立靜止土壓力系數(shù)的計算公式。 2.采用水平層分析法，考慮填土運動相關(guān)聯(lián)流動法則，在擋土墻平移模式下，，建立半無限兩層填土對擋土墻主動土壓力的計算公式；針對分層有限填土路基擋土墻，考慮基巖開挖面對填土滑裂的影響，建立有限兩層填土對擋土墻主動土壓力的計算公式。 3.使用ANSYS軟件，進行有限填土路基對擋土墻土壓力的數(shù)值模擬，分別計算有限填土對擋土墻的靜止土壓力和主動土壓力，分析有限填土路基對擋土墻土壓力的大小及分布，并且詳細分析填土內(nèi)摩擦角、填土與接觸面的摩擦系數(shù)、基巖開挖面傾角對土壓力的影響。
[Abstract]:In highway construction, it is inevitable to build subgrade with half fill and half excavation due to the limitation of terrain condition. In order to guarantee the stability of half-filled and half-excavated subgrade, it is often necessary to build embankment retaining wall. The key problem in retaining wall design is the calculation of earth pressure, which will directly affect the safety of highway. The pressure acting on the retaining wall belongs to the limited soil pressure. At present, the active earth pressure of limited fill is generally calculated in the design of retaining wall, but the displacement condition is necessary for the limited fill to reach active earth pressure. However, some retaining walls do not produce enough displacement to make the limited fill reach the active earth pressure state. For the calculation of active earth pressure of limited fill, according to the method in the present code, the resultant force of limited fill on retaining wall can only be obtained, but the distribution of active earth pressure of limited fill along the back of wall can not be clearly defined. Coulomb's earth pressure theory assumes that the distribution of earth pressure on retaining wall is linear, but some measured results show that the distribution of earth pressure of fill to retaining wall along the back of the wall is not the same. The main contents of this paper are as follows: 1. Based on the concept of excited angle of internal friction, a method for calculating the static earth pressure of retaining wall with semi-infinite filling subgrade is established by analyzing the moire circle of filling stress in the back of retaining wall, considering the influence of the back of retaining wall and the excavating surface of bedrock. The calculation method of static earth pressure of retaining wall by finite fill subgrade is established and compared with that of active earth pressure in code. According to the friction coefficient of different contact surfaces, the formulas for calculating the coefficient of static earth pressure are established. 2. By using horizontal layer analysis method and considering the law of associated flow of fill movement, a formula for calculating active earth pressure of retaining wall with semi-infinite two layers of fill is established under the mode of lateral displacement of retaining wall, and the formula for retaining wall of layered and finite filling subgrade is established. Considering the influence of excavation of bedrock on the slip of fill, a formula for calculating the active earth pressure of retaining wall with finite two layers of fill is established. Using ANSYS software, the numerical simulation of the earth pressure of the limited fill subgrade to the retaining wall is carried out, the static earth pressure and the active earth pressure of the limited fill on the retaining wall are calculated respectively, and the magnitude and distribution of the earth pressure of the limited fill subgrade to the retaining wall are analyzed. The influence of the friction angle, the friction coefficient between the fill and the contact surface and the dipping angle on the earth pressure is analyzed in detail.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.1;U417.11

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