A STUDY ON UTILITY OF SLAKED LIME DERIVING FROM SHELL AS STABILIZER FOR ACIDIC SOILS

贝壳熟石灰作为酸性土壤稳定剂的应用研究

• 批准号: 13650554
• 负责人: YAMADA Mikio
• 金额: $ 1.86万
• 依托单位: Fukui National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650554/
• 关键词: acidic soil; organic matter content; hydrogen ion exponent; oyster shell; calcium hydroxide; stabilization; improvement of subgrade soil; bearing capacity; 酸性硫酸塩土; 含水比; 締固め曲線; 路床土支持力比; 一軸圧縮強さ; 顕在的酸性土; パイライト; CBR; コーン指数; 斜面崩壊

The present study consists of three experiments shown in the following:The first stage is to verify the importance of the biochemical oxidation of pyrite in the weathering process and to find the optimum pH condition for faster oxidation than in nature. The second stage is to clarify the failure mechanism of slope composed from acidic soils by the trace of physical and chemical discontinuities at the boring-core, and the third stage is to investigate the strength characteristics of soil (the pH value<5, the organic matter content>8%) stabilized by using slaked lime deriving from the crushed oyster shell.The main results obtained from various tests are summarized as follows:(1)The ferrous iron oxidation, given as Fe^<2+> + 1/4O_2 + H^+ → Fe^<3+> + l/2H_2O is the most important process in the biochemical oxidation of pyrite and its optimum pH value is 2.5-3.5.(2)When we cut of the boring-core with diameter of about 65mm, length of about 12m in the 100mm interval and measured the water content, pH value, electric conductivity and ignition loss of the 92 samples, it was found that there were discontinuities differed from the physical and chemical properties at the boring-core and perhaps the slope failure was generated in these discontinuities.(3)The unconfined compressive strength of stabilized soil increases in proportion to the lime additive content and curing time.

本研究包括以下三个实验：第一阶段是验证黄铁矿在风化过程中的生物氧化的重要性，并找到最佳的pH值条件下更快的氧化比自然。第二阶段是通过岩芯物理和化学不连续面的痕迹来阐明酸性土组成的边坡的破坏机理;第三阶段是研究土的强度特性（pH值<5，有机质含量>8%）的稳定化处理，主要结果如下：（1）Fe 2+氧化反应是黄铁矿生物氧化过程中最重要的过程，其最适pH值为2.5-3.5，反应式为Fe^<2+> + 1/4O_2 + H^+ → Fe^<3+> +1/2H_2O。（2）在100 mm间隔内截取直径约65 mm、长度约12 m的岩芯，测定92个岩芯的含水量、pH值、电导率和烧失量，发现岩芯处存在与岩芯理化性质不同的不连续面，边坡失稳可能是在这些不连续面上产生的。（3）稳定土的无侧限抗压强度与石灰添加剂含量和养护时间成正比增加。

项目成果

佐野博昭 他4名: "積算温度方式を導入した土の酸性移行速度の評価手法に関する研究"土木学会論文集. 第687号/III-56. 95-105 (2001)

Hiroaki Sano等4人：“利用综合温度法评价土壤酸性迁移率的方法”，日本土木学会学报第687/III-56号（2001年）。

奥村充司 他3名: "酸性堆積軟岩の風化過程における化学的・生化学的特性"材料. 第53巻・第1号. 41-44 (2004)

Mitsushi Okumura 等 3 人：“风化过程中酸性沉积软岩的化学和生化特征”材料，第 53 卷，第 1. 41-44 期（2004 年）。

Mitsushi OKUMURA: "Chemical and Biochemical Characteristics of Acid Sedimentary Soft Rock in the Process of Weathering"Journal of the Society of Materials Science, Japan. Vol.53, No. 1. 41-44 (2004)

Mitsushi OKUMURA​​：“风化过程中酸性沉积软岩的化学和生化特征”日本材料学会杂志。

山田幹雄 他4名: "牡蠣殻由来消石灰および破砕殻を混ぜ合わせた有機質粘土の強度特性"日本材料学会・第5回地盤改良シンポジウム論文集. 181-186 (2002)

Mikio Yamada 等 4 人：“有机粘土与来自牡蛎壳和碎贝壳的熟石灰混合的强度特性”，日本材料科学学会第五届地面改良研讨会论文集，181-186（2002 年）。

Mitsushi OKUMURA: "Fundamental Study on Utility of Crushed Oyster Shell as Materials for Shallow Soil Improvement"International Symposia on Materials Science for 21st Century, Symposium F: Recent Developments of Ground Improvement. 29-32 (2001)

Mitsushi OKUMURA​​：“碎牡蛎壳作为浅层土壤改良材料的实用性基础研究”21 世纪材料科学国际研讨会，研讨会 F：地面改良的最新进展。