Application of microgravity measurement in detecting underground structures
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摘要: 在工程勘察或地基处理之前，需要探测出场地内遗存地下构筑物的位置和规模。然而，当场地内存在大量建筑垃圾、老旧基础以及电磁干扰等多种不利因素时，会导致一些常用地球物理探测方法应用受限。微重力测量方法对场地要求低，可突破上述不利因素限制，在探测地下的质量异常方面具有明显的优势。本文利用CG-5高精度重力仪，对天津市某机械厂城市更新场地的原地下设备间进行探测，经过数据处理和分析，确定了原地下设备间的位置和大致的平面分布情况，为后续的工程勘察和地基处理工作提供了依据，同时也为同类型场地内浅埋地下构筑物的探测积累了经验。Abstract: It is necessary to detect the location and scale of underground structures remaining on the site before engineering investigation or foundation treatment. However, when there are various unfavorable factors such as a large amount of construction waste, old foundations, and electromagnetic interference in the site, it can limit the application of some commonly used geophysical detection methods. The microgravity measurement method has low requirements for the observation site and has significant advantages in detecting underground mass anomalies. This research uses CG-5 high-precision gravity meter to detect the original underground equipment room of a machinery factory in Tianjin. After data processing and analysis, the location and rough plane distribution of the original underground equipment room were determined, providing a basis for subsequent engineering surveys and foundation processing. At the same time, experience has been accumulated for the detection of shallow buried underground structures in the same type of site.
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Key words:
- engineering investigation /
- microgravity measurement /
- underground structures /
- detection
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图 3 居民楼重力效应改正模型
Figure 3. Model for gravity effect correction of residential buildings
图 5 剩余重力异常等值线平面图（仅高度改正）
Figure 5. Plan of residual gravity anomaly contour lines (height correction only)
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