On Characteristic Properties of Consolidation and Sterngth of Unsaturated Soils.

非饱和土固结强度特性研究。

• 批准号: 05660278
• 负责人: FUJIMOTO Masanobu
• 金额: $ 1.41万
• 依托单位: Saga 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: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05660278/
• 关键词: Unsaturated soil; Masa soil; Grain size distribution; Unconfined compression strength; Consolidation; pF; Three phases of soil; 締固め応力; せん断強さ; 乾燥密度; 含水比; 変形係数

To maintain the long-term stability after construction of unsaturated soil structures, it is necessary to clarify the characteristics of consolidation and strength of unsaturated soils. From such a viewpoint, the influences of grain size distribution, degree of saturation snd dry density of soils on the mechanical and soil moisture properties were investgated experimentally using Masa Soils.The following results were obtained.(1)The static stress required to compress up to a constant dry density was smaller, when degree of saturation was higher, or grain sizes had better distributions.(2)Under a constant dry density, unconfined compression strength showed the peak value at a specific moisture content.(3)when the initial condition of soil was constant, unconfined compression strength increased as clay contents of soil increased,(4)The relations of unconfined compression strength and modulus of deformation of unsaturated soil had linearity as well as saturated soils.(5)Consolidation settlements for 24 hrs.were larger, when degree of saturation was higher, or grain sizes had better distributions.(6)As coeffiicient of permeaqbility of Masa Soils was high relatively, the ratios of initial settlement to final settlement were larger as compared to those for saturated soils.(7)Soil moisture characteristic curves were greatly influenced by grain size distribution and their curves sifted to lower side of moisture contents with increasing coarse grain contents.(8)The moisture contents by volume at constant pF increased with increasing clay content of soils.

为了保持非饱和土结构施工后的长期稳定性，有必要明确非饱和土的固结和强度特性。从这一观点出发，利用玛莎土，试验研究了土的粒度分布、饱和度和干密度对力学性质和土壤水分性质的影响，得到了以下结果：(1)当饱和度较高或粒度分布较好时，压缩到恒定干密度所需的静应力较小。(2)在恒定干密度下，无侧限抗压强度在特定的值处呈现峰值。 (3)当土体初始条件一定时，无侧限抗压强度随着土体黏粒含量的增加而增大。(4)非饱和土的无侧限抗压强度与变形模量的关系与饱和土一样呈线性关系。(5)饱和度越高，土体24小时固结沉降越大，或粒度分布越好。(6)作为 与饱和土相比，马萨土的渗透性较高，初沉降与终沉降之比较大。(7)土壤水分特征曲线受粒度分布影响较大，随着粗粒含量的增加，曲线向含水量的下侧移动。(8)恒定pF下的体积含水量随着土壤粘土含量的增加而增加。

项目成果

Fujimoto, Masanobu, Yohsho, Katsuyuki: "On Influences of Grain Size Distribution on Characteristics of Soil Moisture of Masa Soils." Bulletin of the Faculty of Agriculture, Saga University. 79(in press). (1995)

Fujimoto、Masanobu、Yohsho、Katsuyuki：“粒度分布对玛莎土壤水分特征的影响”。

藤本昌宣・用正勝之: "不飽和まさ土の粒度組成の変化が水分特性に及ぼす影響について" 佐賀大学農学部彙報. 79. (1995)

Masanobu Fujimoto 和 Katsuyuki Yoshimasa：“不饱和 Masa 土壤颗粒尺寸组成的变化对水分特性的影响”佐贺大学农学部通报 79。（1995 年）。