Application of slope failure monitoring system and prediction model in forest clear cutting slope.

边坡失稳监测系统及预测模型在森林砍伐边坡中的应用

• 批准号: 14560115
• 负责人: SHUIN Yasuhiro
• 金额: $ 2.3万
• 依托单位: THE UNIVERSITY OF TOKYO
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14560115/
• 关键词: forest clear cutting; shallow slope failure; soil strength; finite elements method; slope safety factor; monitoring system; 森林皆伐斜面; モニタリングシステム; 森林皆伐跡地斜面; 飽和・不飽和浸透; 気象・水文モニタリング; 画像モニタリング; インターネットカメラ

The purpose of this research is to evaluate the influence of forest clear cutting on a occurrence of shallow slope failure with the monitoring system on actual natural sloe and numerical analysis. In addition to the real-time monitoring of slope condition at the moment of occurrence of slope failure, long term monitoring of change of soil strength and soil moisture with forest clear cutting is necessary to clarify the process of slope failure occurrence.In this study, the forest clear cutting slope of the Tokyo University forest in Chiba is selected as the research object. This slope is installed monitoring system as follows(A) Image monitoring system with web camera, (B) Monitoring system of incline of slope soil layer, (C) Weather and Hydrological monitoring system (rainfall, wind velocity, soil moisture, ground water level).The results of application of monitoring system shows that the soil moisture condition level of lower part of the slope is going up comparison with the soil moisture condition of forest standing slope. Soil strength is evaluated with the direct shear test. The result of direct shear test shows that both of cohesion force and internal angle of the soil is reinforced by the root system.With the results of application of monitoring system and shear test, Slope safety factor is calculated with the finite elements method Slope safety factor is rapidly decreasing with the increasing of ground water level, and Concentration of shear strain of the slope layer is emerging the foot part of slope.

摘要本研究旨在利用天然边坡监测系统及数值分析，评估森林皆伐对浅层边坡破坏发生的影响。本文以日本东京大学千叶森林采伐迹地为研究对象，对森林采伐迹地的土壤强度和土壤含水量进行了长期监测，并对监测结果进行了分析。该边坡安装了以下监测系统：（A）网络摄像机图像监测系统，（B）边坡土层倾斜监测系统，（C）气象水文监测系统（降雨量、风速、土壤湿度、地下水位）监测系统的应用结果表明，与2000年的土壤水分状况相比，坡体下部的土壤水分状况水平有所上升。森林立坡用直剪试验评价土的强度。直剪试验结果表明，根系对土体的粘聚力和内角都有增强作用，结合监测系统和剪切试验结果，采用有限元法计算了边坡的安全系数，边坡安全系数随着地下水位的升高而迅速减小，坡脚部位出现了坡积层剪应变集中现象。

项目成果

森林皆伐跡地斜面における表層崩壊モニタリングシステムの現地適用試験

森林采伐地边坡地表塌陷监测系统现场应用试验

• 期刊: 平成15年度砂防地すべり技術研究成果報告会講演論文集 2003
• 作者: 鈴木雅一;執印康裕
• 通讯作者: 執印康裕

Evaluation of shear strain and root system with the direct shear test.

通过直接剪切试验评估剪切应变和根系。

• 发表时间: 2002
• 期刊: Proc.on the symposium in 2002 of the Japan society of erosion control engineering Pub.No.35
• 作者: Ushida Sayuri;Kato Nobuaki;Shuin Yashuhiro
• 通讯作者: Shuin Yashuhiro

Application of slope failure monitoring system in forest cutting slope

边坡失稳监测系统在森林采伐边坡中的应用

• 发表时间: 2003
• 期刊: Proc.on the symposium in 2002 of the Japan society of erosion control engineering Pub.No.37
• 作者: Shuin Yasuhiro;Kato Nobuaki;Suzuki Masakazu
• 通讯作者: Suzuki Masakazu

Application of slope failure monitoring system in forest clear cutting slope

边坡失稳监测系统在森林砍伐边坡中的应用

• 发表时间: 2003
• 期刊: Proc.on the symposium in 2003 of sabo engineering and land slide
• 作者: Suzuki Masakazu;Shuin Yasuhiro
• 通讯作者: Shuin Yasuhiro

根系を含む一面せん断試験における模擬根系及び試料の内部ひずみについて

关于涉及根系的单平面剪切试验中模拟根系和样品的内应变

• 发表时间: 2002
• 期刊: 平成14年度砂防学会研究発表会概要集 PB.35
• 作者: 内田紗由里;加藤誠章;執印康裕
• 通讯作者: 執印康裕