Development of An Acoustic Emission Cone

声发射锥的开发

• 批准号: 63850114
• 负责人: SHIBATA Toru
• 金额: $ 1.47万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63850114/
• 关键词: Acoustic Emission; Cone Penetration; Grain Size; Liquefaction; Soil Property; In-situ Test; 液状化; 地盤調査; アコースティック・エミッション; コーン貫入試験; せん断; 粒径; 拘束圧力

The grain-size of the soil is one of the important or dominating parameter in determining the liquefaction strength of the soil. There is desire to have simultaneously, the information on the properties of soil along with the CPT data. A new cone penetrameter has been developed which has an acoustic emission (AE) sensor installed at its tip. The tentative conclusions are as follows:1. Box shear tests were performed by using 4 different types of sand. The influence of grain-size and the confining pressure on the characteristics of AE when sheared has been investigated. The total AE count increases with the increase in average mean grain-size and the confining pressure.2. AE cone penetration testing has been carried out on the model ground made-up of alternating layers of sand and clay. The development of the acoustic emission is obvious in the sand layer, moreover, a thin sand layer sandwiched between clay layers could also be recognized. The exact relation between AE count rate and cone resistance, at present is under investigation.3. Past literature on the relationship between AE count rate and average grain-size have been reviewed and plotted in the diagram. In this diagram the ordinate is taken as the ratio of AE(D_<50>) and AE(D_<50>=0.25) and the abscissa is taken as average mean grain-size (D_<50>). Results of box shear test have been superimposed on it. The accuracy in predicting the liquefaction potential of soil from the diagram is, rather difficult owing to the scattering of the AE data. Further research is needed while taking into the consideration the effect of the confining pressure.

土的粒度是决定土液化强度的重要或主要参数之一。人们希望同时获得有关土壤特性的信息以及CPT数据。研制了一种新型锥形穿透仪，其尖端安装了声发射传感器。本文的初步结论如下：采用4种不同类型的砂进行箱剪试验。研究了剪切时晶粒尺寸和围压对声发射特性的影响。声发射总数随着平均粒径和围压的增大而增大。在砂土交叠的模型地基上进行了声发射锥侵彻试验。在砂层中声发射发育明显，并且在粘土层之间还可以识别出薄砂层。目前正在研究声发射计数率与锥体阻力之间的确切关系。回顾了过去关于声发射计数率与平均粒度之间关系的文献，并绘制在图中。纵坐标为AE（D_<50>）与AE（D_<50>=0.25）之比，横坐标为平均粒度（D_<50>）。并对箱剪试验结果进行了叠加。由于声发射数据的散射，从图中预测土壤液化势的准确性相当困难。在考虑围压影响的情况下，还需进一步研究。

项目成果

柴田徹: "Evaluation of Liquefaction Potentials of Soils Using Cone Penetration Tests" Soils and Foundations. 28. 49-60 (1988)

Toru Shibata：“使用锥入度测试评估土壤的液化潜力”《土壤与基础》28. 49-60 (1988)。

柴田徹: "AE内蔵コ-ン貫入試験機の試作とその適用" 京都大学防災研究所年報. (1991)

Toru Shibata：“内置AE的锥入度测试仪原型及其应用”京都大学防灾研究所年度报告（1991）。

Shibata, t.: "Evaluation of Liquefaction potentials of soils using cone penetration tests." Soils and Foundations, Vol.28, No.2, pp.49-60, 1988.

Shibata, t.：“使用锥入度测试评估土壤的液化潜力。”

Shibata, T.: "Development of an AE-cone and its application." Annuals, DPRI, Kyoto Univ., 1991.

Shibata, T.：“AE 锥体的开发及其应用。”

道廣一利: "土質分類におけるAEの応用" 土木学会年次学術講演概要集. 982-983 (1989)

Kazutoshi Michihiro：“AE在土壤质量分类中的应用”日本土木工程师学会年度学术讲座摘要982-983（1989）。