直流电阻率法三维超前探测物理模拟

Physical simulation of DC resistivity method 3D advanced prediction technology

巷道掘进过程中,经常受到各种不良地质条件的影响,给生产和安全带来严重隐患,需对其进行超前预测与预报。直流电阻率法作为超前预测的主要手段之一,现有方法技术在观测系统布置、数据采集及后期数据处理等诸多方面仍存在不足,所以开展直流电阻率法超前探测研究具有重要意义。提出一种三维超前探测系统,测试了其在水砂槽模型的物理模拟实验,并采用二维结合三维反演成像的数据处理手段。物理模拟结果表明:实验模型尺寸有限,边界影响显著,“无穷远极”无法达到现场施工要求;对数据进行三维反演,可一定程度上消除边界影响造成的视电阻率梯度渐变,从而准确识别异常位置。

Tunneling often influenced by a variety of adverse geological conditions, bring serious risks to the production and safety, advanced prediction and forecasting is necessary. As one of the main means, existing technologies of advanced prediction are still inadequate in observing system arrangement, data acquisition and data processing and other aspects, so the development of DC resistivity method advanced prediction has important significance. Proposed the 3 D advanced prediction system, testing response and effect in sink and sand-box model experiments, proposed the data processing method of 2 D combine 3 D inversion imaging. The main conclusions of physical simulation are: 2 D advanced methoddifficult to locate anomalies because of the limited size of experimental model, the evident boundary effect and the non-compliance “infinity pole”;the apparent resistivity gradual change caused by boundary effect can be eliminated by 3 D data inversion.