[1] [1] SHI J X, ZHANG Z, ZHANG X K, et al. Research on influencing factors of tunnel water leakage diseases［J］. Chinese Journal of Underground Space and Engineering, 2021, 17(4): 1291-1297.

[5] [5] SHI P X, LI P. Mechanism of soft ground tunnel defect generation and functional degradation［J］. Tunnelling and Underground Space Technology, 2015, 50: 334-344.

[9] [9] TAN K, CHENG X J. Intensity data correction based on incidence angle and distance for terrestrial laser scanner［J］. Journal of Applied Remote Sensing, 2015, 9(1): 094094.

[10] [10] COREN F, STERZAI P. Radiometric correction in laser scanning［J］. International Journal of Remote Sensing, 2006, 27(15):3097-3104.

[11] [11] WAGNER W. Radiometric calibration of small-footprint full-waveform airborne laser scanner measurements: Basic physical concepts［J］. ISPRS Journal of Photogrammetry and Remote Sensing, 2010, 65(6): 505-513.

[12] [12] LIU W L, SUN S S, LI Z X, et al. Compensation of geometric parameter errors for terrestrial laser scanner by integrating intensity correction［J］. IEEE Transactions on Geoscience and Remote Sensing, 2020, 58(10): 7483-7495.

[13] [13] TAN K, CHEN J, QIAN W W, et al. Intensity data correction for long-range terrestrial laser scanners: A case study of target differentiation in an intertidal zone［J］. Remote Sensing, 2019, 11(3): 331.

[14] [14] ZHANG C S, GAO S, LI W, et al. Radiometric calibration for incidence angle, range and sub-footprint effects on hyperspectral LiDAR backscatter intensity［J］. Remote Sensing, 2020, 12(17): 2855.

[15] [15] STONE M H. The generalized weierstrass approximation theorem［J］. Mathematics Magazine, 1948, 21(5): 237.