本文選題：加筋土擋墻 + 車輛荷載　； 參考：《湖南科技大學》2017年碩士論文

【摘要】：在支擋結(jié)構(gòu)中,加筋土擋土墻因其獨特的優(yōu)勢被廣泛應用于邊坡處理及路堤加固等工程中,通常受到長期的交通荷載的作用。論文以330國道蓮都至縉云段改擴建工程為依托,以模塊面板式加筋土擋墻為研究對象,通過理論分析、數(shù)值模擬和現(xiàn)場車載試驗對模塊式加筋土擋墻的設計方法、筋材鋪設方法優(yōu)化、車輛荷載作用下的動響應進行了系統(tǒng)的研究。主要研究內(nèi)容與結(jié)論如下:1、結(jié)合依托工程的地形地質(zhì)條件,采用模塊式加筋土擋墻作為路基支擋結(jié)構(gòu),并進行了擋墻設計。2、基于加筋土擋墻土壓力分布規(guī)律和穩(wěn)定性要求,建立了筋材長度的優(yōu)化方法,并以依托工程資料為基礎進行了實例分析。3、以依托工程為研究對象,采用FLAC3D建立數(shù)值分析模型,分析了靜態(tài)車輛荷載作用下加筋土擋土墻的變形、土壓力以及筋材拉應力的發(fā)展規(guī)律。結(jié)果表明,面墻后側(cè)向土壓力沿墻深度方向呈非線性分布,加筋體后側(cè)向土壓力沿墻深度方向分布曲線近似為線性。同面墻后的側(cè)向土壓力相比,加筋體后的側(cè)向土壓力受車輛位置的影響較大.4、通過建立數(shù)值分析模型,分析了車輛動荷載作用時加筋土擋墻的響應規(guī)律。結(jié)果表明,無論是面墻處的動土壓力峰值還是面墻處的加速度峰值,均在墻頂處取得最大值,并且隨著車輛行車位置遠離面墻,峰值迅速減小。5、開展了加筋土擋墻的現(xiàn)場試驗,測試了施工過程中和受車輛荷載作用后擋土墻的應力應變發(fā)展規(guī)律。結(jié)果表明,靜態(tài)車輛荷載作用時,加筋體后附加側(cè)向土壓力實測峰值比Boussinesq理論值稍小,但實測峰值發(fā)生的位置比理論值要深;當車輛荷載作用在加筋體上時,車輛行車距離對加筋體內(nèi)產(chǎn)生的動土壓力影響不大,當車輛荷載作用在加筋體后時,車輛行車距離對加筋體內(nèi)的動土壓力大小及分布模式有很大影響;無論是在靜態(tài)車輛作用下還是在車輛動載作用下,加筋體后側(cè)向土壓力遠大于面墻后的側(cè)向土壓力。
[Abstract]:In the retaining structure reinforced earth retaining wall is widely used in slope treatment and embankment reinforcement because of its unique advantages and is usually subjected to long-term traffic load. In this paper, the design method of modular reinforced earth retaining wall is studied by theoretical analysis, numerical simulation and in-situ test, based on the reconstruction and extension project of the section from Liandu to Jinyun of 330National Road, taking the reinforced earth retaining wall of modular panel type as the research object. The reinforcement laying method is optimized and the dynamic response of vehicle under load is studied systematically. The main research contents and conclusions are as follows: 1. Combined with the topographic and geological conditions of the engineering, the modular reinforced earth retaining wall is adopted as the retaining structure of the roadbed, and the design of the retaining wall is carried out. The design of the retaining wall is based on the law of the earth pressure distribution and the requirement of the stability of the reinforced earth retaining wall. The optimization method of reinforcement length is established, and based on the engineering data, an example analysis is made. Taking the backing engineering as the research object, the numerical analysis model is established by using FLAC3D, and the deformation of reinforced earth retaining wall under static vehicle load is analyzed. The development law of earth pressure and tensile stress of steel bars. The results show that the lateral earth pressure distribution is nonlinear along the depth of the wall, and the distribution curve of the back lateral earth pressure of reinforced body is approximately linear along the depth direction of the wall. Compared with the lateral earth pressure behind the same plane wall, the lateral earth pressure after the reinforcement body is greatly affected by the position of the vehicle. By establishing the numerical analysis model, the response law of the reinforced earth retaining wall under the dynamic load of the vehicle is analyzed. The results show that both the peak value of dynamic earth pressure at the wall and the peak of acceleration at the wall reach the maximum at the top of the wall, and the peak value decreases rapidly with the driving position of the vehicle away from the wall. The field test of reinforced earth retaining wall is carried out. The stress-strain development law of retaining wall during construction and under vehicle load is tested. The results show that the measured peak value of the additional lateral earth pressure is slightly smaller than that of Boussinesq, but the position of the measured peak value is deeper than that of the theoretical value, and when the vehicle loads are on the reinforced body, the measured peak value is lower than that of the Boussinesq theory. The vehicle driving distance has little effect on the dynamic earth pressure generated by the reinforced body. When the vehicle load is on the reinforced body, the vehicle driving distance has a great influence on the size and distribution of the dynamic earth pressure in the reinforced body. The lateral earth pressure of the reinforced body is much larger than the lateral earth pressure behind the wall, whether under the static vehicle action or under the vehicle dynamic load action.
【學位授予單位】：湖南科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U417.11

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