西藏拉洛水利枢纽沥青混凝土骨料质量评价及料场比选

沥青混凝土心墙是土石坝的重要结构,骨料、填料等原材料质量对心墙抗渗性、耐久性及适应变形的能力具有决定性影响。以位于西藏自治区日喀则市的拉洛水利枢纽工程为例,初拟2处沥青混凝土人工骨料石料场以资比选,进行了各项质量参数的试验检测,综合考虑各种因素后选定了运距虽然相对较远但质量更好的卡贡灰岩石料场作为料源,确保高原、高寒、高海拔地区沥青混凝土心墙坝的安全。同时,分析、讨论了沥青混凝土用人工骨料原材料岩石质量评价时应注意的若干问题,并提出了解决问题的意见和建议,可供下一步修订相关标准时参考。

Quality Evaluation of Asphalt Concrete Aggregate and Comparison and Selection of Material Yard for Laluo Water Conservancy Project in Tibet

Asphalt concrete core wall is an important structure of earth rock dam. The quality of raw materials such as aggregate and filler has a decisive influence on the impermeability, durability and deformation adaptability of the core wall. With Laluo water conservancy project in Rikaze city of Tibet Autonomous Region as an example, we compared two artificial aggregate quarries for the asphalt concrete through testing and inpection of multiple quality parameters. After comprehensive consideration of various factors, we selet Kagong limestone yard which is more distant yet boasts better rock quality as the material source to ensure the safety of asphalt concrete core dam in plateau, cold and high altitude areas. Moreover, we analyze and discusse some problems that should be paid attention to in the quality evaluation of raw materials of artificial aggregate for asphalt concrete, and put forward some suggestions to solve the problems for reference in the revision of relevant standards.