【摘要】 针对盾构法建设煤矿斜井时的地质勘探难题,在钻孔掘进电法超前监测(bore-tunneling electrical ahead monitoring,BEAM)系统的基础上引入了电阻率层析成像技术,改进了激励和测量模式,为掘进工作面前方地质状况的反演成像提供了解算条件。为提高反演成像的速度,提出了虚拟接地电极等价模型来代替原来的保护电极模型。最后,通过物理模型试验研究了不同虚拟接地电极位置对反演结果的影响。结果表明:当异常体的几何中心与刀盘之间的距离分别为0.15m和0.20m,而虚拟接地电极与刀盘之间的距离分别为0.26m和0.35m时,反演出来的异常体位置与物理模型试验中的异常体位置最为接近,验证了这种方法的可行性。更多还原

【Abstract】 To solve the geological exploration problems when the shield method is used to construct inclined shafts in coal mines,the electrical resistivity tomography technology was introduced based on the bore-tunneling electrical ahead monitoring(BEAM)system and the excitation and measurement mode was improved to provide a solution condition for the inversion imaging of geological conditions in front of the tunneling face.In order to improve the speed of inversion imaging,a virtual grounding electrode equivalent model was proposed to replace the original guard electrode model.Finally,the influence of different virtual grounding electrode positions on the inversion results was studied through a physical model test.The results show that when the distance between the geometric center of the abnormal body and the cutterhead is respectively 0.15 mand 0.20 m,and the distance between the virtual grounding electrode and the cutterhead is respectively 0.26 mand 0.35 m,the inverted abnormal body position is the closest to the abnormal body position in the physical model test,which verifies the feasibility of this method.更多还原