To investigate the effectiveness of Wenner AMN &
MNB joint inversion imaging in the division of rock contact zones, a geoelectric
model of soft and hard rock with integral and local surface highresistance
bodies is constructed, and the response characteristics of different highdensity electrical arrays to the inversion resistivity are analyzed.
Furthermore, the ability of Wenner AMN & MNB joint inversion imaging to
identify the contact zone of rock strata under varying overburden resistivity
and thickness is discussed, and the response characteristics of the resistivity
section are investigated by changing the dip angle of the contact zone. The
results reveal the following: (1) The interference of the local highresistance body on the inversion section is stronger than that of
the whole high-resistance body, but the influence depth is shallow. (2) The
inversion fracture surfaces of different arrays are consistent with the preset
models, but the Wenner AMN & MNB joint inversion has a larger detection
depth and a more detailed description of the dip angle. (3) With a decrease in
overburden resistivity or an increase in overburden thickness, the
identification ability of Wenner AMN & MNB joint inversion to dip angle
decreases. (4) The Wenner AMN & MNB joint inversion can track the change of
rock dip angle, but the highresistance overlying
strata are prone to false lowresistance anomalies in
the contact zone. Based on the application of rock stratum division of
diversion tunnel at Si′an reservoir, the occurrence and
position of contact zone obtained by Wenner AMN & MNB joint inversion
imaging are more consistent with the actual exposure than those obtained by
conventional electrical method device.
TAN Lei
,
JIANG Xiaoyi
,
HU Xiongwu
,
XU Hu
. Simulation and Application of Wenner AMN & MNB
Joint Inversion Imaging in Concealed Soft and Hard Rock Contact
Zone[J]. Tunnel Construction, 2023
, 43(9)
: 1501
-1510
.
DOI: 10.3973/j.issn.2096-4498.2023.09.007
