摘要
为研究砂砾石填料的压实检测方法和指标,结合某机场工程实例,选取典型砂砾石填料进行颗分试验,确定了砂砾石的分类为碎石土中的圆砾,且颗粒级配连续,可作为机场飞行区道面影响区填料使用;结合颗分试验结果,并通过理论分析,确定了砂砾石填料的密实度一般采用固体体积率(灌水法)进行检测;重点对影响灌水法试验检测结果精度的试坑直径因素进行现场对比试验,确定了检测试坑直径为60cm;在碾压参数(虚铺35~40cm,振动碾压14遍)压实条件下,并以试坑直径60cm的检测结果为准,确定了飞行区道面影响区砂砾石密实度检测合格双控指标为:干密度≥2.20g·cm-3,固体体积率≥85%。成果可用于工程后续大面积飞行区道面影响区填筑,同时可为类似工程提供参考依据。
This paper presents a case history of an airport construction project for quality control methods and compaction indices of sandy gravel soils.Typical sandy gravel samples were collected and classified as the well graded rounded sandy gravel from the grain size distribution tests.It is determined that this material can be used as the fill material for the runway and its associated areas.Based on the grain size distribution analysis results and analytical approaches,the density of the sandy gravel is commonly determined by the in-situ solid ratio method(water preplacement method).This is paper discusses the influence of the test pit diameter on the accuracy of the density of the soil test by the water replacement method.Under the sample compaction parameters(loose thickness of soil 35~40cm and vibratory compaction of 14passes)and a test pit diameter of 60cm,the QA-QC acceptance criteria for the compaction of runway area using sandy gravel soil are:dry density greater than 2.20g·cm-3 and the solid ratio greater than 85%.
作者
朱恒元
韩进宝
ZHU Hengyuan;HAN Jinbao(Urumqi Lingkong Development Construction and Development(Group)Co.,Ltd.,Urumqi 840016;Civil Airport Planning Design and Research Co.Ltd.,Beijing 10029)
出处
《土工基础》
2020年第4期549-551,562,共4页
Soil Engineering and Foundation
关键词
砂砾石
颗分
灌水法
固体体积率
Sandy Gravel Soils
Grain Size Distribution
Unit Weight Test by Water Replacement Method
Solid Ratio
