To improve the fineness,
accuracy, and stability of tunnel lining internal defect detection, and reduce
the risk of leakage and misdetection, an elaborate tunnel lining quality
inspection method based on ultrasonic phased array is developed. Comprehensively
considering the defects distribution within lining arch space and the equipment
capacity, a full-coverage continuous elaborate
inspection approach is proposed based on regulate inspection grid and scanning
mode, therefore balancing detection efficiency and fineness. Benefiting from
the multiple coverage acquisition and synthetic aperture focusing imaging
properties of the ultrasonic phased array technology, the signal-to-noise ratio and resolution of the
detection data can be effectively improved, compared to conventional point-by-point tapping and limited-lines radar detection. As a result, the fineness and imaging
effectiveness of the lining internal defects detection can be enhanced. This
method is applied to a practical tunnel to perform elaborate lining inspection
within the scope of longitudinally 14 m × circumferentially 4 m at the tunnel crown, the inspection ability of the method
proposed is verified from detecting 14 mm-diameter
rebar and central-embedded water-stop belt. The internal structure of the tunnel lining is
demonstrated in three-dimensional image, contributing
to accurate identification of the lining internal defects.
YUAN Zhenyu
,
YE Zhendong
,
AN Zheli
,
MA Weibin
,
HU Honglin
,
GUO Zigang
. Elaborate Inspection Method
for Tunnel Lining Quality Based on
Ultrasonic Phased Array[J]. Tunnel Construction, 2024
, 44(S2)
: 237
-244
.
DOI: 10.3973/j.issn.2096-4498.2024.S2.024
