一种近全方位电阻率隧道超前地质预报方法

Advance geology forecast method of nearly omnibearing resistivity tunnel

Abstract

本发明公开了一种近全方位电阻率隧道超前地质预报方法,通过在隧道内选定若干条相互平行的测线,各测线均固定供电电极A作为点电源,三条测线的点电源A均要求紧贴掌子面,B极则放置在相对无穷远处;依次对每条测线进行测量,采集多个测点的测量电极之间的电位差测量;根据测量的电位计算每一个视电阻率值,并标注与之对应的测点位置,获得视电阻率‑极距曲线关系图,对视电阻率值有明显变化的测点对应位置进行测深反演,得到真电阻率‑深度图;真电阻率‑深度图中确定深度,以各个测线的点电源为圆心,以深度为半径,画出等深圆,各个测线的等深圆共同交点处确定为不良地质体的精确位置。本发明现场操作简单,效率高,效果好等优点。
The invention discloses an advance geology forecast method of a nearly omnibearing resistivity tunnel. The advance geology forecast method of the nearly omnibearing resistivity tunnel comprises the following steps: selecting a plurality of measuring lines which are parallel to one another in the tunnel, wherein a power supply electrode A is fixed on each measuring line and is used as a point power supply, the point power supplies A of the three measuring lines are required to be closely attached to a tunnel face, and a pole B is placed at a position which is relatively infinitely far from the measuring lines; measuring the measuring lines successively, and acquiring measurement of potential difference among measuring electrodes of a plurality of measuring points; calculating each apparent resistivity value according to measured potential, labeling measuring point positions corresponding to the apparent resistivity values, acquiring an apparent resistivity-polar distance curvilinear relationship, and carrying out depth sounding inversion on the positions corresponding to the measuring points of which the apparent resistivity values are changed obviously to obtain a true resistivity-depth map; and determining the depth in the true resistivity-depth map, drawing up an isobathic circle by taking the point power supply of each measuring line as a center of a circle and taking the depth of a radius, and determining the common point of intersection of the isobathic circles of the measuring lines as an accurate position of an unfavorable geologic body. The advance geology forecast method has the advantages of simplicity in field operation, high efficiency, good effect and the like.

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