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Research about the mechanism of surface slope failure in clear-cutting forest area

皆伐林区地表边坡失稳机理研究

基本信息

批准号：
16580117
负责人：
SHUIN Yasuhiro
金额：
$ 2.37万
依托单位：
Utsunomiya University (2005)The University of Tokyo (2004)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16580117/
关键词：
Monitoring system Surface slope failure Soil strength parameter Soil moisture 浸透計算皆伐斜面

项目摘要

In this research topic, the monitoring of clear-cutting mountainous slope was carried out for the estimation of effect of clear-cutting on mechanics of surface slope failure. In the monitoring slope, clear-cutting was executed in 1999, and tree planted in 2000. The objectives of survey obtained by monitoring system are as follows, a) the image monitor with the Internet camera, b) Meteorological and Hydrological data (rainfall, air soil moisture, ground water table). As for the monitoring system, we developed the system which can be applied for the natural slope without the commercial power supply.The image monitoring system synchronized with rainfall events can effectively give the image information of general hill slope condition before and after surface slope failure occurrence.From the data of the fluctuation of soil moisture with the time lapse before and after deforestation, the following are confirmed. 1) The total amount of soil moisture in the slope after deforestation totally shows the tendency of increasing due to the decreasing of evapo-transpiration of forest vegetation, although the tendency of fluctuation of soil moisture varies by site of the slope. 2) The soil moisture content in surface soil layer at upper part of slope shows the decreasing trend. On the other hand, the moisture content in middle and lower soil layer at bottom part of slope shows the increasing trend.The estimation of slope failure risk by site is done by combining the infiltration model and the slope stability model which use the soil strength parameter.

在本研究课题中，为评估采伐对地表边坡破坏机理的影响，对采伐后的山体进行了监测。在监测边坡中，1999年进行了采伐，2000年进行了植树。监测系统获得的调查目标如下：a)带有网络摄像头的图像监视器；b)气象和水文数据(降雨量、大气土壤湿度、地下水位)。在监测系统方面，开发了适用于无商业供电的天然边坡的监测系统，通过与降雨事件同步的图像监测系统，有效地给出了地表滑坡发生前后的一般山坡状况的图像信息；从毁林前后土壤水分随时间变化的数据中，证实了以下结论。1)毁林后坡面土壤水分总量因森林植被蒸散量减少而总体呈增加趋势，但不同坡位土壤水分波动趋势不同。2)坡面上部表层土壤含水率呈下降趋势。另一方面，坡体底部中下部土层含水率呈增加趋势，利用土体强度参数结合入渗模型和边坡稳定性模型进行场地边坡失稳风险评估。