【作者】 乔丽平；

【导师】 王钊； 曾亚武；

【作者基本信息】 武汉大学 ， 岩土工程， 2005， 硕士

【摘要】 自从法国工程师Vidal H.提出“加筋土”的概念以来,加筋土挡墙和土坡以其独特的优点被广泛应用于土建、铁路、公路等工程中,各个国家也相应地制定了加筋土挡墙和土坡的设计规范。在目前的规范中,对加筋土挡墙的高度大多有限制规定(如我国的铁路行业中要求单级墙高不大于10m),但这些限制规定大多建立在经验的基础上。因此,从理论上给出加筋土坡的临界高度值是一个值得研究的问题。 我国现行的《水利水电工程土工合成材料应用技术规范》(SL/T225-98)有关加筋土挡墙的设计部分有很多地方取材于美国联邦公路管理局(Federal Highway Administration)制订的《FHWA-NHI-00-043》,但也有一些不同,特别是对于土工格栅加筋土挡墙的设计。因此,有必要比较两设计规范在加筋土挡墙(尤其是土工格栅加筋土挡墙)设计上的异同,以便为我国相关规范的修改工作提供一定的参考依据。 论文围绕以上两个问题展开工作,其工作主要包括以下几个方面的内容: 1.全面总结和回顾了土工合成材料在国内外的应用和发展情况,并重点回顾了加筋土挡墙与土坡的研究现状; 2.总结了加筋土结构的特点并阐述了加强土的基本原理; 3.分别以传统塑性理论和广义塑性理论为基础,用极限分析法推导了加筋土坡的临界高度计算公式,通过与前人的试验数据的比较,表明该公式是可行的; 4.分析了各影响因素对加筋土坡临界高度的影响,并通过正交试验对坡角竖直情况下的加筋土坡临界高度的影响因素进行了敏感性分析; 5.比较了我国规范《水利水电工程土工合成材料应用技术规范》(SL/T225-98)和美国规范((FHWA-NHI-00-043》在加筋土挡墙设计上的异同,通过一设计算例进行了具体说明,并进行了设计参数的影响分析; 6.指出了研究工作中的不足,为今后进行这方面的研究提供了方向。更多还原

【Abstract】 Since the concept of the "reinforced soil" was put forward by the France engineer Vidal H., the reinforced retaining walls and slopes were extensively used in civil engineering, railway, highway, and so on, because of the especial advantages, the design codes on the reinforced retaining walls and slopes were made out in each country. In the present codes, the maximum height of the reinforced retaining wall was limited (for example, the height of single wall was less than 10m in our railway engineering), but the limits were mostly based on the practice. So, determining the critical height of the reinforced slopes from theory was a key problem to be worth studying.The present code 《Standard for application of geosynthetics in hydraulic and hydro-power engineering》 (SL/T225-98) in our country was similar to the American code 《FHWA-NHI-00-043》 of American Federal Highway Administration on design of the reinforced retaining wall, but there were some differences between the two design codes, especially for the design of the geogrid reinforced retaining wall. So, it was necessary to compare the two design codes on the reinforced retaining wall (especially for the geogrid), which could be used as reference for modification of our country design codes.The main research work began around the two questions in the paper, as follows:1. The applications and developments of geosynthetics in our country and abroad were extensively summarized, especially for the present study on the reinforced retaining walls and slopes;2. The property and the basic principle of the reinforced soil structure was summarized;3. The computation formulations on the critical height of reinforced slope were deduced by limit analysis method based on the classical plasticity theory and the generalized plasticity theory, compared with the previous experimental values of the reinforced slopes, showing that the formulations were feasible;4. Each influence factor on the critical height of the reinforced slope was analyzed, sensibilities of influence factors on the critical height of the vertical reinforced slope were analyzed by orthogonal test;5. The China design code 《Standard for application of geosynthetics in hydraulic andhydro-power engineering )> ( SL/T225-98 ) and the American design code ((FHWA-NHI-00-043)) were compared, the differences were explicitly explained by a design example, at the same time, the influence of the design parameters was analyzed; 6. The shortcomings of the paper and the research directions were pointed out for the advanced research.更多还原