The invention discloses an in-hole transient electromagnetic geological forecasting method for a drilling and blasting construction tunnel, and relates to the technical field of tunnel engineering and engineering geophysical prospecting, and the method comprises the following steps: adopting a working mode of exciting in-hole receiving by a tunnel face in an in-hole transient electromagnetic method, and arranging in-hole magnetic probes according to advanced horizontal drilling; a transmitting coil is arranged by taking a tunnel face drilling hole opening as a center, a transmitting device adopts a rectangular small loop frame, excitation of a magnetic dipole source in any direction is realized through a working mode of fixed-point corner type excitation, a magnetic probe adopts an in-hole special three-component low-frequency magnetic probe, observation of three magnetic field components can be realized, and thus a three-dimensional array type observation system is constructed. Electromagnetic field interference near an excavated hole body section and a tunnel face can be greatly reduced; the burying depth of a magnetic probe in a drill hole needs to be larger than that of a transient electromagnetic detection blind area, and reference is provided for construction of a transient electromagnetic inversion initial model by measuring resistivity information of surrounding rock of a drill hole section.
本发明公开了一种用于钻爆施工隧道的孔内瞬变电磁地质预报方法,涉及隧道工程、工程物探技术领域,该方法内容:孔内瞬变电磁法采用掌子面激发孔内接收的工作方式,依据超前水平钻孔进行孔内磁探头布设,以掌子面钻孔孔口为中心进行发射线圈布设,发射装置采用矩形小回线框,通过定点转角式激发的工作模式,实现任意方向磁偶源的激发,磁探头采用孔内专用三分量低频磁探头,可实现三道磁场分量的观测,以此构建三维阵列式观测系统,可大幅减少已开挖洞身段及掌子面附近的电磁场干扰;钻孔内磁探头埋设深度需大于瞬变电磁探测盲区,通过测量钻孔段围岩电阻率信息,为瞬变电磁反演初始模型构建提供参考。
In-hole transient electromagnetic geology forecasting method for drilling and blasting construction tunnel
一种用于钻爆施工隧道的孔内瞬变电磁地质预报方法
30.01.2024
Patent
Elektronische Ressource
Chinesisch
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