关键词: 岩溶发育, 综合精细勘探, 三维可视化模型, 组合赋权, 区划评价

Abstract: The evaluation of regional karst development degree can provide a reference basis for the prevention and control of
geological disasters and the planning of construction in karst areas. However, conventional single-method drilling and geophysical exploration techniques have limitations and cannot fully reveal the spatial characteristics and distribution patterns of karst development from a holistic perspective. This can lead to significant safety risks in engineering construction within such regions. Taking a residential construction area in Niuquan Town, Laiwu District, Jinan City as an example, high-density resistivity, microdynamic spectrum ratio and electromagnetic wave CT were used to perform a comprehensive and detailed geophysical exploration analysis of karst features. Based on the geological drilling data, a three-dimensional geological structure visualization model of the study area was established. Through the comprehensive interpretation of geophysical exploration and the three-dimensional geological structure model, the karst development characteristics and distribution patterns of the study area were fully revealed. Meanwhile, the improved CRITIC subjective-objective combined weighting method was adopted to conduct a comprehensive evaluation of the karst development degree in the study area. The results show that the integrated exploration methods and the three-dimensional geological structure model established based on borehole data mutually complement and verify each other, robustly revealing the developmental characteristics and patterns of underground karst in the study areaincluding its formation locations, overall scale, distribution morphology, spatial extent, and connectivity. The combined weight of the evaluation indicators influencing the degree of karst development, from the largest to the smallest, are as follows: the distribution density of karst caves, the distribution of soluble rocks, the type of soil layer structure, the thickness of the Quaternary strata, and the thickness of the Paleogene non-soluble rocks. The study area is categorized into three types: highly developed karst zones, moderately developed karst zones, and underdeveloped karst zones with areas of 7,939.325 m², 17,737.1347 m², and 36,169.07 m², respectively. The highly developed karst zones are predominantly located in the southeastern part of the study area. The research methods and conclusions provides a reference for site selections of engineering projects in karst areas.