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.

土壤的晶粒大小是确定土壤液化强度的重要参数之一。人们希望同时拥有有关土壤特性以及CPT数据的信息。已经开发了一种新的锥体穿透器，该锥体在其尖端安装了声发射（AE）传感器。暂定结论如下：1。使用4种不同类型的沙子进行盒剪切测试。研究了晶粒尺寸的影响以及剪切时对AE特性的限制压力的影响。总AE计数随着平均平均晶粒大小和限制压力的增加而增加。2。 AE锥渗透测试已在由沙子和粘土的交替层组成的模型地面上进行。在砂层中，声发射的发育很明显，此外，也可以识别出夹在粘土层之间的薄砂层。目前正在研究AE计数率和锥体电阻之间的确切关系3。在图中审查并绘制了有关AE计数率和平均晶粒大小之间关系的过去文献。在此图中，纵坐标被视为AE（D_ <50>）和AE（D_ <50> = 0.25）的比率，并且腹部为平均平均晶粒大小（D_ <50>）。盒子剪切测试的结果已叠加在其上。由于AE数据的散射，预测土壤的液化潜力的准确性是相当困难的。在考虑限制压力的影响时需要进一步的研究。

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)。

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。”

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.: "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）。