Development of highly impervious geomaterials using hydrophobic soil and demonstration of their applicability to natural slopes

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05045
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 25030:Disaster prevention engineering-related
• Research Institution: Kobe University
• Principal Investigator: Kato Shoji 神戸大学, 工学研究科, 准教授 (10204471)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 疎水材 / 遮水層 / 接触角 / 模型土槽

Outline of Final Research Achievements

Slope failures due to torrential rains cause damage to human lives and property every year, and combined with recent abnormal weather conditions such as guerrilla rains, there is a growing sense of social crisis. In this study, we examined the possibility of using hydrophobic materials as impervious geomaterials with a high degree of long-term interception and drainage functions against rainwater infiltration into unsaturated natural slopes. One of the objectives of this study was to fabricate an impervious material and install an impervious layer in the cheapest and simplest way possible. The impervious materials were prepared using a diluted solution of commercially available concrete curing materials. The impervious layer made by the model soil tank maintained its impervious function for 26 months, and the effectiveness of this method was verified.

Free Research Field

地盤工学

Academic Significance and Societal Importance of the Research Achievements

近年，集中豪雨による土砂災害が増加している。土砂災害は，降雨による浸透が土のせん断抵抗を低減し，このことが斜面崩壊を引き起こす原因となり発生すること多い。このため，自然斜面に対して，表層部への降雨浸透に対する強化対策技術の開発は急務であると考えられる。その一つの方法として，自然斜面や土構造物斜面の表層に遮水性の高い疎水性地盤材料を用いることにより表層からの降雨浸透を抑え，表層崩壊を防ぐ方法が考えられる。本研究では，この優れた雨水遮断・排水機能を持つ疎水材料の利点および特性を活かし，遮水材層への適用性と長期持続性を評価して，自然斜面や土構造物斜面の安定性の向上を図ることを目的としている。