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一种用于隧道地震探测的半自动耦合检波器

A Semi-Automatic Coupling Geophone for Tunnel Seismic Detection.

作者信息

Wang Yao, Fu Nengyi, Fu Zhihong, Lu Xinglin, Liao Xian, Wang Haowen, Qin Shanqiang

机构信息

State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, No. 174 Shazhengjie, Chongqing 400044, China.

School of Electrical Engineering, Chongqing University, No. 174 Shazhengjie, Chongqing 400044, China.

出版信息

Sensors (Basel). 2019 Aug 29;19(17):3734. doi: 10.3390/s19173734.

DOI:10.3390/s19173734
PMID:31470534
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6749232/
Abstract

The tunnel seismic method allows for the detection of the geology in front of a tunnel face for the safety of tunnel construction. Conventional geophones have problems such as a narrow spectral width, low sensitivity, and poor coupling with the tunnel wall. To tackle issues above, we propose a semi-automatic coupling geophone equipped with a piezoelectric sensor with a spectral range of 10-5000 Hz and a sensitivity of 2.8 V/g. After the geophone was manually pushed into the borehole, it automatically coupled with the tunnel wall under the pressure of the springs within the device. A comparative experiment showed that the data spectrum acquired by the semi-automatic coupling geophone was much higher than that of the conventional geophone equipped with the same piezoelectric sensor. The seismic data were processed in combination with forward modeling. The imaging results also show that the data acquired by the semi-automatic coupling geophone were more in line with the actual geological conditions. In addition, the semi-automatic coupling geophone's installation requires a lower amount of time and cost. In summary, the semi-automatic coupling geophone is able to efficiently acquire seismic data with high fidelity, which can provide a reference for tunnel construction safety.

摘要

隧道地震法能够检测隧道掌子面前方的地质情况，以保障隧道施工安全。传统检波器存在诸如频谱宽度窄、灵敏度低以及与隧道壁耦合性差等问题。为解决上述问题，我们提出了一种半自动耦合检波器，它配备了一个压电传感器，频谱范围为10 - 5000赫兹，灵敏度为2.8伏/克。将检波器手动推入钻孔后，它会在装置内弹簧的压力作用下自动与隧道壁耦合。对比实验表明，半自动耦合检波器采集到的数据频谱远高于配备相同压电传感器的传统检波器。地震数据结合正演模拟进行处理。成像结果还表明，半自动耦合检波器采集到的数据更符合实际地质条件。此外，半自动耦合检波器的安装所需时间和成本更低。综上所述，半自动耦合检波器能够高效地采集高保真地震数据，可为隧道施工安全提供参考。

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