非洲地区黑棉土路基处理技术研究

发布时间：2018-01-13 08:12

本文关键词：非洲地区黑棉土路基处理技术研究　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：黑棉土是一种广泛分布于非洲东部的膨胀土，它吸水膨胀、失水收缩，，且反复运动，给公路建设项目的安全质量带来了极大的危害。本文以黑棉土作为研究对象，以埃塞俄比亚某高速公路为依托，通过项目在地质调绘、地质勘察、设计、施工控制过程中的具体工作，对黑棉土的分布、特性、成因和地基处理方案和施工处理工艺等进行了系统的研究，其成果已在工程中应用，对于其他类似区域黑棉土地基处理也借鉴意义。本文的研究工作和成果如下： 1.通过黑棉土含水量、塑性指数、膨胀系数等试验指标的变化情况，分析判断了黑棉土的特性、膨胀等级等，为处理黑棉土地基提供了理论依据。 2.分析研究区降雨及土壤入渗影响深度，判断路基安全工作区范围和黑棉土处理深度，为黑棉土地基处理提供设计依据。 3.通过对比国内外膨胀土处理方案，并根据本项目的特点，提出适应本项目，并满足埃塞业主需求的路基处理方案。 4.在分析路段黑棉土特性基础上，根据高速公技术标准要求，进行了黑棉土路基处理设计，并提出了施工工艺流程和检测标准 5.根据本项目沿线筑路材料的分布情况、材料特性，通过填料的物理力学指标分析、渗透性试验及试验段铺筑不同季节的对比状况，提出了黑棉土地基处理回填材料的要求及注意事项。 6.根据试验路段的不同季节病害状况，提出了低填路基优化方案。
[Abstract]:Black cotton soil is a kind of expansive soil which is widely distributed in the eastern part of Africa , it absorbs swelling , loses water and shrinks , and has brought great harm to the safety quality of highway construction project . 1 . Based on the change of moisture content , plasticity index and expansion coefficient of black cotton , the paper analyzes the characteristics and expansion grade of black cotton soil , and provides theoretical basis for treatment of black cotton land base . 2 . Analyze the influence depth of rainfall and soil infiltration in the research area , judge the area of subgrade safety work area and the treatment depth of black cotton soil , and provide design basis for the treatment of black cotton land base . 3 . By comparing the expansion soil treatment plan at home and abroad , and according to the characteristics of the project , this project is proposed and the subgrade treatment scheme for the requirements of Eplug owner is met . 4 . On the basis of analyzing the characteristics of black cotton soil of road section , according to the requirements of high speed public technical standard , the design of subgrade treatment for black cotton soil is carried out , and the construction process flow and detection standard are proposed . 5 . According to the distribution and material characteristics of road building materials along the line of the Project , the requirements and precautions of the black cotton land based treatment and backfilling materials are put forward by analyzing the physical and mechanical indexes of the packing , the permeability test and the comparison of different seasons in the test section . 6 . Based on the different seasonal diseases of the test section , a low - fill subgrade optimization scheme is proposed .

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1

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