土工基础

土工基础 ›› 2021, Vol. 35 ›› Issue (2): 212-217.

• 测试技术 • 上一篇    下一篇

AccuPycⅡ1340在钙质砂比重测试中应用

贤全真1,2，龙盛军3，王雪晴2，霍玉龙1,2，王毅锟1,2   

  1. （1.桂林理工大学土木与建筑工程学院，广西桂林 541004；2.中国科学院武汉岩土力学研究所，武汉 430071；3.重庆市地质矿产勘查开发局205地质队，重庆 402160）
  • 收稿日期:2020-03-27 修回日期:2020-03-30 出版日期:2021-04-23 发布日期:2021-04-24
  • 通讯作者: 龙盛军（1970-），男，高级工程师，研究方向为水文地质工程地质。
  • 作者简介:贤全真（1992-），男，硕士研究生，研究方向为岛礁水文地质。

Application of AccuPycⅡ1340 in the Specific Gravity Testing on Calcareous Sand Samples

XIAN Quanzhen1,2, LONG Shengjun3, WANG Xueqing2, HUO Yulong1,2， WANG Yikun1,2   

  1. (1.College of Civil and Architectural Engineering, Guilin University of Technology, Guilin 541004；
    2.Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071；
    3.205 Geological Division, Chongqing Geological and Mineral Exploration Bureau, Chongqing 402160)
  • Received:2020-03-27 Revised:2020-03-30 Online:2021-04-23 Published:2021-04-24

摘要： 海洋生物成因的钙质砂多形状不规则、易破碎，富含孔隙和内孔隙，与一般陆源砂有较大区别，其比重可能因孔隙内孔隙和测试方法而略有不同。采用比重瓶法、浮称法和AccuPycⅡ1340真密度仪对我国某岛礁的钙质砂以及标准石英砂进行比重测定，比较三种测试方法测定钙质砂比重的差异。AccuPycⅡ1340真密度仪测定各粒组钙质砂研磨前后的真密度，分析各粒组钙质砂闭孔隙率并提出比重建议值。结果表明不同粒组钙质砂三种测定方法测得的比重值有差异，但比重瓶法与真密度仪测定结果相差较小，浮称法与真密度仪测定结果差异较大；不同粒组钙质砂闭孔隙差异较大，建议钙质砂比重值2.81。从分析速度、准确性和试验便捷性等方面看，AccuPycⅡ1340真密度仪适宜各粒径钙质砂比重测定。

关键词: 钙质砂, 比重, AccuPycⅡ1340真密度仪, 比重瓶法, 浮称法

Abstract: With properties significantly different from quartz sand of land origin, the calcareous sand of marine origin has irregular in grain shape, fragile and porous with both inter-connected and inner pores. Due to the inner porosity of the calcareous sand, the tested specific gravity values might be slightly different from different testing methods. Three different specific gravity testing methods: Pycnometer Method, Suspended Weighing Method and AccuPycII 1340 True Density Meter Method, are used to test the specific gravity values of both calcareous sand and quartz sand samples. The results are also evaluated. The “true density” values and the inner porosity of calcareous sand samples were tested by the AccuPycII 134 True Density Meter before and after the grain grinding. The results indicate that the tested specific gravity values were different with different testing methods. Smaller differences on values tested by Pycnometer Method and True Density Meter Method, comparing with the values tested by Suspended Weighing Method and True Density Meter Method. The inner porosity values on different grain size samples are different. A specific gravity value of 2.81 is suggested for the calcareous sand samples. From the testing time, testing accuracy and easiness points of view, AccuPycII 1340 True Density Meter Method is appropriate for the specific gravity testing on calcareous sand samples with various grain sizes.


Key words: calcareous sand, specific gravity, AccuPyc Ⅱ 1340 true density meter, pycnometer method, suspended weighing method

中图分类号: