巷道直流透视二维反演成像技术及应用

Two-dimensional inversion imaging technology and application of voice frequency electric perspective in mine

巷道直流透视技术,在煤矿工作面底板或顶板隐伏富水异常体的探查方面已有很多成功的实例,但是针对该方法的成像方法及局限性的研究较少。为了论证该方法的可靠性和局限性,从理论模型异常分析及反演成像,工程实测数据成像解释进行讨论。首先采用直流电三维有限元,模拟了工作面底板赋存单个富水陷落柱和多个富水陷落柱模型的响应。根据典型煤矿巷道参数设计理论模型,探讨了三极透视成像方法合成数据响应对陷落柱的反应能力。进一步对理论模型进行了二维反演成像,成像结果表明,成像结果沿巷道方向二维反演有较强的分辨率,而垂直巷道方向由于受观测方式的限制,异常呈条带状,异常位置与实际存在偏差。最后对陕北某矿工作面的巷道直流透视工程实例进行了二维反演成像,处理结果表明该方法横向敏感,纵向由于观测数据不完备,定位能力较差。

There have been many successful examples of roadway direct current perspective technology in the exploration of the hidden water rich abnormal body in the coal face floor or roof,but the research on the imaging method and limitations of this method is limited.In order to demonstrate the reliability and limitation of this method,the theoretical model anomaly analysis,inversion imaging,and imaging interpretation of Engineering measured data are discussed.Firstly,the response of single and multiple water rich collapse columns on the floor of the working face is simulated by three-dimensional finite element method.According to the theoretical model of typical coal mine tunnel parameter design,the response ability of composite data response of three pole perspective imaging method to collapse column was discussed in this paper.Furthermore,the two-dimensional inversion imaging of the theoretical model is carried out,and the imaged results show that the imagings along the tunnel direction have a high resolution,while the vertical tunnel direction is limited by the observation method.The results show that the anomalies are strip-shaped,and the abnormal location is deviated from the actual situation.Finally,the two-dimensional inversion imaging is carried out for an example of audio electric perspective engineering in a mining face in Northern Shaanxi.The processing results show that the method is sensitive to the transverse direction and poor in the longitudinal direction due to incomplete observation data.