车辆荷载作用下加筋土挡墙的力学响应分析

发布时间：2018-06-08 23:32

本文选题：加筋土挡墙 + 车辆荷载　；参考：《湖南科技大学》2017年硕士论文

【摘要】：在支挡结构中,加筋土挡土墙因其独特的优势被广泛应用于边坡处理及路堤加固等工程中,通常受到长期的交通荷载的作用。论文以330国道莲都至缙云段改扩建工程为依托,以模块面板式加筋土挡墙为研究对象,通过理论分析、数值模拟和现场车载试验对模块式加筋土挡墙的设计方法、筋材铺设方法优化、车辆荷载作用下的动响应进行了系统的研究。主要研究内容与结论如下:1、结合依托工程的地形地质条件,采用模块式加筋土挡墙作为路基支挡结构,并进行了挡墙设计。2、基于加筋土挡墙土压力分布规律和稳定性要求,建立了筋材长度的优化方法,并以依托工程资料为基础进行了实例分析。3、以依托工程为研究对象,采用FLAC3D建立数值分析模型,分析了静态车辆荷载作用下加筋土挡土墙的变形、土压力以及筋材拉应力的发展规律。结果表明,面墙后侧向土压力沿墙深度方向呈非线性分布,加筋体后侧向土压力沿墙深度方向分布曲线近似为线性。同面墙后的侧向土压力相比,加筋体后的侧向土压力受车辆位置的影响较大.4、通过建立数值分析模型,分析了车辆动荷载作用时加筋土挡墙的响应规律。结果表明,无论是面墙处的动土压力峰值还是面墙处的加速度峰值,均在墙顶处取得最大值,并且随着车辆行车位置远离面墙,峰值迅速减小。5、开展了加筋土挡墙的现场试验,测试了施工过程中和受车辆荷载作用后挡土墙的应力应变发展规律。结果表明,静态车辆荷载作用时,加筋体后附加侧向土压力实测峰值比Boussinesq理论值稍小,但实测峰值发生的位置比理论值要深;当车辆荷载作用在加筋体上时,车辆行车距离对加筋体内产生的动土压力影响不大,当车辆荷载作用在加筋体后时,车辆行车距离对加筋体内的动土压力大小及分布模式有很大影响;无论是在静态车辆作用下还是在车辆动载作用下,加筋体后侧向土压力远大于面墙后的侧向土压力。
[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.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U417.11

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