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Volume 45 Issue 2
Apr.  2026
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Article Navigation >  CARSOLOGICA SINICA  > 2026  >  45(2): 329-341
LI Xingru, GONG Siyu, CAO Cong, LIU Zhi, JIANG Xun, LIANG Yun. Study on cross-borehole resistivity CT method for detecting typical karst collapses in the Chongqing region[J]. CARSOLOGICA SINICA, 2026, 45(2): 329-341. doi: 10.11932/karst20260204
Citation: LI Xingru, GONG Siyu, CAO Cong, LIU Zhi, JIANG Xun, LIANG Yun. Study on cross-borehole resistivity CT method for detecting typical karst collapses in the Chongqing region[J]. CARSOLOGICA SINICA, 2026, 45(2): 329-341. doi: 10.11932/karst20260204
shu

Study on cross-borehole resistivity CT method for detecting typical karst collapses in the Chongqing region

doi: 10.11932/karst20260204

  • Nanjiang Hydrogeological & Engineering Geology Brigade, Chongqing Bureau of Geology and Minerals Exploration, Chongqing 401147, China

  • Received Date: 2024-11-26
  • Accepted Date: 2025-08-07
  • Rev Recd Date: 2025-04-11
    Abstract
  • Karst ground collapses in the Chongqing region are characterized by concealment, sudden occurrence, and unpredictability, making them difficult to detect accurately using conventional geophysical methods. Cross-borehole resistivity computed tomography (CT), with its unique observation geometry and high imaging resolution, is well-suited for the detailed detection of hidden hazards in karst regions.The evolution of typical karst collapses in the Chongqing region can be summarized into three stages: soil cave incubation, formation, and expansion. During the incubation stage, the soil above the bedrock remains intact and stable, with water levels in karst conduits fluctuating periodically due to rainfall but without significantly affecting the stability of the overlying layer. In the formation stage, activities such as tunnel construction cause a rapid drop in groundwater levels, leading to a sharp increase in negative pressure within the karst conduits. This results in increased seepage pressure and gradual loosening of the overlying soil, forming localized cavities. During the expansion stage, repeated suffusion and erosion cause the soil cave to enlarge further, the roof depth to decrease, and eventually, surface collapse occurs.Based on a review of the formation mechanisms of karst collapses in Chongqing, this study developed geophysical resistivity models for the three stages mentioned above. Finite element forward modeling and smooth inversion calculations were employed to verify the effectiveness of cross-borehole resistivity CT in detecting karst collapses at different evolutionary stages. In the models, electrode spacing was set to one meter, and borehole spacing was set to 10 m. Simulation results demonstrate that cross-borehole resistivity CT technology can clearly delineate the spatial distribution characteristics of karst conduits and soil caves at each stage, with inversion errors less than 0.5 meters. In practical applications, cross-borehole resistivity CT successfully identify the morphology of hidden collapses and their associated karst conduits, effectively overcoming the limitations of traditional surface resistivity methods in terms of vertical resolution and detection accuracy, thereby providing an efficient solution for detecting karst collapses in complex geological settings.　This study expands upon the traditional methodologies for detecting karst collapses, demonstrating the significant advantages of cross-borehole resistivity CT in improving the accuracy of identifying hidden karst conduits and soil cavities. Future research should focus on refining the technical parameters of this method to enable dynamic monitoring and more precise interpretation of concealed karst collapses. Such advancements will provide critical support for the scientific prevention and mitigation of karst disasters in Chongqing, thereby contributing to the sustainable and safe development of the Chengdu–Chongqing economic circle.

     

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