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Research on the Prediction of Stability for the Excavated Slopes by Using Monitoring Systems

利用监测系统预测开挖边坡稳定性的研究

基本信息

批准号：
03650400
负责人：
KAWAKAMI Hiroshi
金额：
$ 0.96万
依托单位：
SHINSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650400/
关键词：
Excavated slopes Slope stability Monitoring system Extensometer Accident of workers Earth fall disaster

项目摘要

Prior to construction of retaining walls, slopes are excavated in most of slopes. However, some slopes often lose their stability and slope failure occur. Construction workers were often died by an attack of earth fall from collapsed slopes. Accidents by earth fall are large in number next to falling from higher place, traffic accidents and accidents by construction equipments during construction work. As the results of investigation on 219 slopes in all,it was considered to set up monitoring system by the extensometers on 30 percents of the slopes in order to confirm stability of the slopes. According to the measurement of displacements on the slopes, 6 percents of the extensometers showed some displacements. 2 percents of the extensometers showed the displacements of more than 4mm in a hour and gave an alarm for an earth fall to the workers. 0.4 percents of the extensometers were useful for refuge of workers.It is considered that the number of such a construction work reaches to one thousand in a year in Nagano Prefecture including those along city roads and town roads. Worker's accidents by earth fall usually occur once or twice a year in Nagano Prefecture. It may be reasonable value that 0.4 percents of the extensometers gave useful information. As the results of displacement measurement at many slopes, it has been clear that the monitoring system is effective not only for refuge of workers but also for quick performance of construction work. Also, it is reasonable to give alarm with displacements of 4 mm in an hour.

在建造挡土墙之前，大部分斜坡都会进行挖掘。然而，一些边坡经常发生失稳并发生边坡失稳。建筑工人经常死于从坍塌的斜坡上掉下的泥石流。高空坠落事故、交通事故和施工机械事故在事故中的数量仅次于施工机械事故。根据对219个斜坡的勘察结果，考虑在30%的斜坡上安装伸缩仪监测系统，以确定斜坡的稳定性。根据对斜坡上的位移的测量，6%的伸缩仪出现了一定的位移。2%的伸缩仪在一小时内显示的位移超过4 mm，并向工作人员发出坠地警报。有0.4%的伸缩器是工人避难所。据认为，长野县每年有1000个这样的建筑工程，包括城市道路和城镇道路沿线的工程。在长野县，工人因坠地而发生的事故通常每年发生一到两次。0.4%的伸缩仪提供了有用的信息，这可能是合理的。根据对多个斜坡的位移测量结果，该监测系统不仅对工人的避难所有效，而且对建筑工程的快速施工也是有效的。此外，在一小时内位移4毫米的情况下发出警报是合理的。