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This study aims to assess the applicability of various observation systems for evaluating the quality of concrete cut-off walls using the elastic wave CT method， focusing on their accuracy and reliability in detecting internal defects within the concrete. Five distinct observation system layouts were employed to capture the propagation signals of the simulating elastic wave source within the concrete cut-off wall. The internal structure of the concrete cut-off wall was reconstructed utilizing the shortest-path ray algorithm and the Gauss-Newton inversion method. The performance of each system layout in signal acquisition， data processing， and image reconstruction was compared and analyzed through experiments. The results show that the fixed observation system layout demonstrates superior performance when the depth of the cut-off wall is shallow and the equipment can provide full coverage. The positioning error can be controlled within 0.5 m， with a signal-to-noise ratio higher than 25 dB， ensuring high detection precision. For deep walls exceeding the coverage range of the equipment， mobile observation system layouts show significant advantages. Among them， the balanced and optimized mobile observation system layout is more suitable for rapid， large-scale screening. A practical engineering case confirmed that the balanced and optimized observation system can successfully identify the local defects in a 61 m deep cut-off wall. Through comparative analysis， this study eatablishes a quantitative selection criteria for observation systems based on indicators such as positioning error， relative wave velocity error， and signal-to-noise ratio.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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