细砂填料改良技术的试验研究  

Experimental study of improvement technology of subgrade fill consisting of poorly graded fine sand

作　　者：范云[1] 汪英珍[1] 

机构地区：[1]石家庄铁道学院,河北石家庄050043

出　　处：《岩土力学》2003年第6期965-968,共4页Rock and Soil Mechanics

摘　　要：秦-沈客运专线某标段的路基填料由洁净、均匀而级配不良的细砂组成,为满足《秦-沈线铁路路基施工技术细则》[1]的质量要求,施工单位在对该填料进行大量的改良对比试验基础上,探索出了经济合理的细砂改良技术方案,按此配方及施工工艺完成了数百万方的路基施工填筑任务,为细砂改良积累了大量的技术数据和宝贵经验。通过对细砂填料改良的试验研究,发现了文献[1]的某些规定和检测指标尚须进一步商榷和改进。笔者从理论和实践上对匀粒细砂改良的必要性、文献[1]双指标控制标准等问题提出了质疑,揭示和阐述了匀粒细砂K30值偏小的内在原因和填料强度随填筑深度的变化规律。The subgrade fill of some reaches of Qin-Shen Special Passenger Line consists of clean, round and poorly graded fine sand. For satisfied with 揇etailed Rules and Regulations of Qin-Shen Line Railway Subgrade Construction Technology? on the basis of a vast amount of comparative test, an economical and rational technical plan for improvement of fine sand is determined. According to the material proportion and construction technology, several millions of cubic meters of subgrade construction have been completed. A vast amount of technology data and rich experience for improving fine sand has been accumulated. Through analysis and study for improvement of fine sand, making further improvement on much respects has been found. On the basis of integration of theory with practice, this paper raises a calling in question for necessity of improvement of fine sand fill and control standard with a double targets; beside, reveals and sets forth essence of K30 value of poorly graded fine sand being on the low side and change regularity of fill strength as construction height.

关 键 词：匀粒细砂 圆砾 填料改良 K30 孔隙率 相对密度 铁路路基 路基施工 

分 类 号：U214.11[交通运输工程—道路与铁道工程]