PERMEABILITY AND COMPRESSIBILITY OF MIXED SOIL COMPOSED OF VOLCANIC COHESIVE SOIL AND SHIRASU

火山粘性土与Shirasu混合土的渗透性和压缩性

• 批准号: 62560240
• 负责人: NANBA Naohiko
• 金额: $ 1.47万
• 依托单位: Kagoshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62560240/
• 关键词: Kuroboku Soil; Shirasu; Mixed Soil; Impervious Soil; クロボク; 排水強度; 圧密係数; 不飽和透水係数; 粒子破砕; 三軸圧縮強度; 混合モデル; 変形解析

The purpose of this research is to find out suitable soil material as an impervious one. Kuroboku soil for a cohesive soil and Shirasu for a sandy soil were chosen in this subject. The results obtained are as follows.1. In case the mix ratio of Shirasu is below 50%, the mixed soil comes to show physical properties similar to Kuroboku soil ; while when it is above 70%, the mixed one comes to show those similar to Shirasu. The maximum dry density of it shows the high value as the ratio increases.2. The shearing characteristics are subjected to the initial density, confining pressure and crushing of grain. For these factors, the increment of deviator stress is reduced with increasing of strain. As a result of it, values of angle of shearing resistance at the high confining pressure are lower than those at low pressure.3. The mixed soil containing the sand fraction of 65% is the impervious material having the coefficient of permeability of 10^<-6>cm/sec, the cohesion of 0.4 kgf/cm^2 and the angle of internal friction of 25 degree.Judging from these results, the mixed material compacted at the mix ratio of about 60% is considered to be the most suitable impervious material below 0.2 of compression index.

本研究的目的是寻找合适的土壤材料作为防渗材料。本课题选择黑北土作为粘性土，白须土作为桑迪。研究结果如下：1.当白苏的混合比例低于50%时，混合土的物理性质与黑北土相似;当白苏的混合比例高于70%时，混合土的物理性质与白苏相似。最大干密度随配比的增大而增大.剪切特性受初始密度、围压和颗粒破碎程度的影响。由于这些因素的影响，偏应力的增量随应变的增加而减小。结果表明，高围压下的抗剪角小于低围压下的抗剪角.含砂率为65%的混合土是渗透系数为10^<-6>cm/s、粘聚力为0.4 kgf/cm^2、内摩擦角为25 °的防渗材料，从这些结果来看，以60%左右的混合比压实的混合材料被认为是压缩指数低于0.2的最合适的防渗材料。

项目成果

Koichi Miwa: "Engineering Properties of Compacted KUROBOKU-SHIRASU Mixtures" Bull. Facu. Agri. Kagoshima Univ., 39, 301-307, 1989.

Koichi Miwa：“压实的 KUROBOKU-SHIRASU 混合物的工程特性”公牛。

若松千秋: "高拘圧下におけるシラスのせん断特性" 鹿児島大学農学部学術報告. 39. 293-300 (1989)

若松千秋：“高围压下银鱼的剪切特性”鹿儿岛大学农学部学术报告39。293-300（1989）。

若松千秋: 鹿児島大学農学部学術報告. 39. 293-300 (1989)

若松千秋：鹿儿岛大学农学部学术报告。39. 293-300 (1989)。

三輪晃一: "クロボク・シラス混合土の非排水強度特性" 農業土木学会論文集. 138. 69-74 (1988)

Koichi Miwa：“日本黑莓和银鱼混合土壤的不排水强度特性”日本农业土木工程师学会学报 138. 69-74 (1988)。

平瑞樹: "有限要素法によるシラスの破壊に関する非線形弾性解析" 鹿児島大学農学部学術報告. 40. (1990)

平水树：“使用有限元法对银鱼断裂进行非线性弹性分析”学术报告，鹿儿岛大学农学部40。（1990）。