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Development of AE counting system and it's application to monitoring of ground behavior

AE计数系统的研制及其在地面行为监测中的应用

基本信息

批准号：
16560436
负责人：
TANO Hisataka
金额：
$ 2.37万
依托单位：
Nihon University
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

项目摘要

The researchers developed a simple AE monitoring system which records only rate count corresponded with AE wave over a threshold. This is to be able to automatically record for a long term (i.e. more than 400 days) by battery power without a computer.This system is made economically and so we can use many systems in field. One system is composed of two amplifiers and AE sensors. That is, the characteristic point of the system is to adopt an active-dummy method for a noise of AE signal. In AE measurements, especially in the field, it is not so easy to distinguish any noise from recorded signals. Therefore, an active AE sensor is directly attached onto a rock or a wave-guide while a dummy sensor is not attached onto them. If an AE count is recorded at the same time in active and dummy sensors simultaneously, the active count is cancelled from the record for a given time interval. These AE counting systems were applied to many fields and underground structures in Japan, Turkey and Egypt.For example, for about sixty years, a town called Babadag in Turkey has been suffering from a landslide. Babadag is located about sixty kilometers far from Denizli City. The main part of this town is located on a horst-like hill. Two small creeks situated on the east and west limit the area of the town. The elevation of the town is about 700 meters. In this twon, we installed the AE system, ground surface deformation through hand-held laser distancemeter, pipestrainmeter, ground water level, rainfall, temperature and humidity.According to comparison with each other's parameters obtained by these integrated monitoring systems, it is shown that AE activities well corresponded to the surface movement of the landslide and the amount of rainfall. Especially, it is obvious that there a time lag between the AE activities and the rainfall. These time lag were observed in many Japanese fields.This AE monitoring system developed by the project has enough practicality in field.

研究人员开发了一种简单的AE监测系统，该系统只记录与超过阈值的AE波相对应的频率计数。这是能够自动记录的长期（即超过400天）由电池电源没有电脑。该系统是经济的，所以我们可以使用许多系统在外地。一个系统由两个放大器和AE传感器组成。也就是说，该系统的特征点是对AE信号的噪声采用主动-虚拟方法。在声发射测量中，特别是在现场，从记录的信号中区分任何噪声并不容易。因此，有源AE传感器直接附着在岩石或波导上，而虚拟传感器不附着在它们上。如果同时在活动和虚拟传感器中记录AE计数，则在给定的时间间隔内从记录中取消活动计数。这些声发射计数系统在日本、土耳其和尼泊尔的许多领域和地下结构中得到应用。例如，土耳其的一个名叫Babadag的城镇在大约60年的时间里一直遭受山体滑坡。巴巴达位于距离德尼兹利市约60公里的地方。这座城市的主要部分位于一座像马垒一样的小山上。两条小溪位于东部和西部限制了城镇的面积。该镇海拔约700米。通过对滑坡体声发射系统、手持式激光测距仪、管式应变仪、地下水位、降雨量、温度、湿度等综合监测参数的对比分析，表明滑坡体声发射活动与滑坡体地表移动和降雨量有较好的对应关系。特别是AE活动与降雨之间存在明显的时滞。本项目开发的声发射监测系统在现场具有一定的实用性。