SDG无核密度仪测定土的压实度标定试验研究  

Experimental study on calibration test of Soil Density Gauge

作　　者：杜伟飞[1,2] 沈云霞[3] 刘争宏[1,2] 于永堂[1,2] 羊群芳[1,2] 

机构地区：[1]机械工业勘察设计研究院有限公司,西安710043 [2]陕西省特殊土工程性质与处理技术重点实验室,西安710043 [3]兰州大学西部灾害与环境力学教育部重点实验室,兰州730000

出　　处：《工程勘察》2016年第7期5-10,共6页Geotechnical Investigation & Surveying

基　　金：国家科技支撑计划(2013BAJ06B00)

摘　　要：无核密度仪是一种快速检测土样干密度的无损检测技术。为了研究SDG无核密度仪的干密度测试效果,制备了不同压实度、含水率的黄土试样,利用SDG法和烘干法、灌砂法对制备土样进行干密度、含水率测试,完成SDG标定工作,并基于两种方法的测试结果建立了密度和体积含水率的线性数学修正模型。试验结果表明,采用标准的标定方法测试的含水率结果偏大,影响干密度的准确测试;通过建立的修正模型对SDG测试结果进行修正后,含水率测试误差大幅度降低,提高了SDG法的干密度测试精度。在质量含水率与干密度组成的坐标系中,干密度测试结果相对可靠的区域为一斜向上的条带状区域。Soil density gauge（ SDG） is a nondestructive technique that could quickly measure the dry density of compacted soil. In order to study the test effection of SDG,the loess samples with different dry density and moisture content are prepared in laboratory,then the SDG is calibrated according to the test results of sand replacement test and oven-drying method test. Based on the test results,the linear mathematical calculation model is established for the density and moisture content. The test results show that the moisture content is high obtained by the standard calibration method and the dry density is incorrect; The moisture content and dry density result accuracy could be improved greatly calibrated according to the model. The reliable results zone of dry density by SDG technique is shown in a inclined upward strip area in the coordinate system of dry density against water content.

关 键 词：SDG密度仪 标定试验 测试误差 修正模型 

分 类 号：TU413[建筑科学—岩土工程]