Experimental Study on Mechanical Properties of Volcanic Ash Soils as Fill Materials for Barthfill Dams and Road Construction

火山灰土作为巴斯菲尔水坝和道路建设填料的力学性能试验研究

• 批准号: 04555121
• 负责人: OHNE Yoshio
• 金额: $ 1.34万
• 依托单位: Aichi Institute of Technology (A.I.T.)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04555121/
• 关键词: Earthfill; Filltype Dam; Volcanic Ash Cohesive Soil; Compaction; Thxiotropy; Strength Regain; Stress Transmission; Strength Reduction

In order to study mechanical properties of volcanic ash cohesive soil like Kanto-Loam, when utilized as earth materials for earthfill dams and subgrade soil under the pavement, such as strength reduction (softening) due to cyclic loading of roller compaction, thixotropic strength regain after compaction, and transmission of compacting load in the fill, several roller compaction tests were performed for model earthfills by measuring earth and pore-water pressures during compaction and spacial and time-dependent changes of strength of fill materials by cone penetration and unconfined compression tests.Strength of fill materials increases at first as compaction proceeds up to a certain extent but decreases gradually after than due to the collaps of soil skelton, by approximately 45 percent of the maximum value in qu-value. According to the results of cyclic triaxial tests, qu-value and static and dynamic deformation moduli are good indices to explain softening due to compaction.Strength regain properties were hard to recognize in model compaction tests because of large scatters of strength data. Laboratory tests on the other hand gave some suggestions that the rate of strength regain is higher for materials easy to soften, and than qc-and qu-values sometimes show different results for strength regain because of their different reactions in strength increase.

为了研究像关东壤土这样的火山灰粘性土用作填土坝土料和路面下路基土时的力学特性，如碾压循环荷载引起的强度降低（软化）、压实后触变强度恢复等。通过测量压实过程中的土压力和孔隙水压力以及空间和时间依赖性，对模型填土进行了多次碾压试验通过锥入度和无侧限压缩试验，填充材料的强度变化。随着压实进行到一定程度，填充材料的强度首先增加，但之后由于土骨架的塌陷而逐渐降低，大约为最大值的45%以 qu 值表示。根据循环三轴试验的结果，qu值和静态和动态变形模量是解释压实软化的良好指标。由于强度数据分散，在模型压实试验中很难识别强度恢复特性。另一方面，实验室测试表明，易软化的材料的强度恢复率较高，并且由于它们对强度增加的反应不同，qc 和 qu 值有时会显示不同的强度恢复结果。

项目成果

NARITA Kunitomo: "A Few Experiments on Accuracy of Response and Practicability in the Field of Newly Developed Earth Pressure Cells" Research Report of Aichi Institute of Technology. No.29 (to be printed). (1994)

NARITA Kunitomo：《关于新开发土压力盒领域响应精度和实用性的一些实验》爱知工业大学研究报告。

OKUMURA Tetsuo: "On the Strength Characteristics of Volcanic Loam due to Roller Compaction" Research Report of Aichi Institute of Technology. No.28. (1993)

OKUMURA​​ Tetsuo：《论火山壤土碾压的强度特性》爱知工业大学研究报告。

成田 国朝: "新たに開発した土圧計の精度と現場への適用性に関する実験" 愛知工業大学研究報告. 第29号,(投稿済み).

成田国友：《新开发的土壤压力计的精度和现场适用性的实验》爱知工业大学研究报告第29号（提交）。

奥村哲夫: "転圧締固めを受けた火山灰質土の強度特性に関する研究" 愛知工業大学研究報告. 第28号(投稿済み).

奥村哲夫：《压实火山灰土的强度特性研究》爱知工业大学研究报告第28号（提交）。

大根 義男: "転圧締固めを受けた火山灰質土の強度特性に関する研究" 愛知工業大学研究報告第28号B. 28. (1993)

大根义夫：“压实火山灰土的强度特性研究”爱知工业大学研究报告第28 B. 28号。（1993年）