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Studies on Rock Grouting Acoustic Emission Method

岩石注浆声发射法研究

基本信息

批准号：
60850112
负责人：
NAKAJIMA Iwao
金额：
$ 7.42万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

项目摘要

In rock grouting, it is necessary to control the grouting conditions of cement milk not to cause the relaxation of rock foundation by an excess of hydraulic fractures. At the beginning of this study, the acoustic emission monitorings were carried out in rock grouting in order to apply acoustic emission signals from hydraulic fractures to control signals of grouting. As the obdervational results, the acoustic emission activity increased corresponding to the external work performed in the cases of cracked solid rock and the behavior of crack proparation wasemonitored successfully prior to a leakage. However, the number of acoustic emissions enough to monitor the behavior of the tock foundation were not detected in the cases of weak rock.form the above results, it became necessary to trasform the displacement of rock foundation into the frequency of acoustic emission occurrence and the acoustic emission monitoring rod was developed by the method of trial and error. Thies rod consists of the composite materials of rosin and wolly glass fiber and generates acoustic emissions in propotion to the deformation of rock foundation.

在岩石灌浆中，必须控制水泥浆的灌浆条件，使其不因水力裂缝过多而引起岩石地基的松弛。本文首先对岩石注浆过程进行了声发射监测，目的是将水力裂隙产生的声发射信号用于注浆控制信号。实验结果表明，在岩石破裂的情况下，声发射活动随外力的作用而增加，并成功地监测到了岩石破裂前的裂纹扩展行为。在软岩地基中，由于没有检测到足够数量的声发射信号，因此有必要将软岩地基的位移量转化为声发射信号发生的频率，并采用试错法研制了声发射监测棒。该杆由松香和毛状玻璃纤维复合材料组成，产生与岩石地基变形成正比的声发射。