RESEARCH OF THE UNDERDRAIN EFFECT

暗渠效应研究

• 批准号: 10460106
• 负责人: NAKANO Toshirou
• 金额: $ 3.46万
• 依托单位: NIIGATA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10460106/
• 关键词: drainage conduit; collecting channel; growth and yield point investigation; bearing value load carrying capacity; cone index; vane shear; Coulomb's failure criterion; effective stress analysis; 暗渠; ベーンせん断; 三軸試験; 側圧一定試験; 圧密沈下; 均平度; 大区画化; 土壌水

Vane test which can be measured from settlement and slip ratio is suitable for measuring bearing capacity of soil of paddy field where the plant remains of the intactness piles up deeply. In the time which cuts down the rice plant, plow layer dried. The shear resistance force of the soil increases, because the soil structure is reconstituted by fiber component in the plant remains, when it consists so. It was proven that the friction resistance component excelled for the mowing stage in the silty cohesive soil, though the shear resistance force was almost fixed. In the way which connected one of two underdrains in lateral drain, the soil water tension is largely in the drying tendency, and especially, there is largely the drying of the plowsole layer than the plow layer in the connected hot day in August. It is based on the effect of the transpiration from the rice plant, since there is the root group area in the plowsole layer.

叶片试验可以通过沉降量和滑移率来测量，适用于完整植物残体深埋的水田土壤承载力的测定。在把稻苗砍倒的时候，犁层干了。当植物残体中含有纤维成分时，土壤的抗剪力增大，这是由于植物残体中的纤维成分对土壤结构进行了重构。结果表明，在粉质粘性土的割草阶段，虽然剪切阻力几乎是固定的，但摩擦阻力分量表现优异。在横向排水中，两个下水孔中的一个连接方式，土壤水分张力主要处于干燥趋势，特别是在8月连接的炎热天气中，犁底层的干燥程度大于犁层。它是基于水稻植株的蒸腾作用，因为在犁头层有根群面积。