A study of the spatial and temporal variations in water content around cavity based on high-density resistance
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摘要: 通过室内建立物理模型，基于高密度电阻动态监测，研究了地下洞室在排水过程中含水量的时空变化过程。实验发现，洞室周围不同位置点的电阻变化曲线有明显的差别。另外，引入了电阻相对变化率的概念，发现整个实验过程中，介质电阻相对变化率的分布图像随时间不断变化并与介质排水过程对应。研究表明采用电阻变化曲线和电阻相对变化率分布图像反映含水量的变化具有可行性，高密度电阻动态监测对于反映洞室周围含水量的变化和水分运移具有很好的效果。Abstract: Based on the physical model established in laboratory and high-density resistance data, a study of water content in the spatial and temporal variation in draining process around underground cavity was made. The experiment results reveal that points at different positions around cavity have distinct resistance differences, the spatial distribution and temporal variations in resistance relative variation rate around the cavity can fit to the draining process in the experiment. The results demonstrate that high-density resistance can reveal the change in water content and the migration of water around cavity in accurate and effective way.
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Key words:
- highdensity resistance /
- ERT /
- cavity /
- unsaturated zone /
- water content /
- spatial and temporal variation
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