Karst development characteristics and influencing factors in the Yangtze River- Pearl River Watershed in Huaxi, Guiyang
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摘要: 受地形地貌和水文地质条件影响,一般认为分水岭地区岩溶富水性较弱,在地质安全风险评价中多被划分为低风险区,然而在贵阳花溪长江–珠江分水岭地区某工程场地勘探过程中,揭露了岩溶较为发育现象。为解释这一现象并揭示岩溶发育的影响因素,在场地调查、高密度电法测量的基础上,重点应用光学影像三维模型构建、CT扫描等多种技术方法对岩溶结构进行了多尺度测量,基于结构特征讨论了岩溶发育的影响因素。结果表明,岩心的岩溶孔洞尺寸为10−6~1 m级,共跨越7个数量级。宏观尺度(10−1~1 m)岩溶发育具有垂向分带性,可划分为岩溶溶洞带、裂隙溶隙带和深部裂隙带;细观尺度(10−3~10−1 m)分析结果体现了岩溶介质的非均质性特征,表现为溶孔在埋深9~12 m、20~25 m、34~40 m和47~49 m发育程度较好;微观尺度(10−6~10−3 m)形态表征参数区分了裂隙与溶孔特征差异,判定了岩溶发育底界埋深为69 m。长江–珠江分水岭在该段存在显著岩溶现象可归因于断裂破碎带控制的空间条件、平缓地形下良好的入渗补给条件,其空间分布受排泄基准面和断裂破碎带控制。该研究成果可为岩溶区工程地质和地质灾害研究提供方法借鉴和技术支撑。Abstract:
The degree of karst development is a critical factor influencing geological hazard risks in karst terrains. Conducting detailed hydrogeological surveys to characterize karst features and their development intensity forms the essential basis for risk zonation and mitigation strategies related to geological disasters, engineering water inrush, mineral resource extraction, and foundation stability. In watershed areas, karst aquifers are generally considered to exhibit weak water abundance due to topographic and hydrogeological constraints, and are thus commonly classified as low-risk zones in geological safety assessments. However, investigations at a project site in the Huaxi District of Guiyang, located within the Yangtze River-Pearl River watershed divide, revealed locally well-developed karst features. To explain this anomaly and elucidate the controlling factors of karst development, this study integrated field surveys and high-density electrical resistivity tomography with multi-scale analyses of karst structures observed in drill cores. Techniques including optical image-based 3D modeling and computed tomography scanning were employed. The influencing factors were subsequently discussed based on the derived structural characteristics. Field survey results indicate that the study area is situated on a karst plateau, featuring landforms such as peak forest valleys and peak cluster depressions. High-density electrical resistivity tomography profiles identified two sets of karst development zones: a vertical karst development zone, extending downward below 1045 m elevation, and a sub-horizontal karst development zone, located between1045 m and1055 m elevation, which dips gently north-to-south across a 135 m profile length. A borehole drilled within the vertical development zone revealed dissolution features spanning seven orders of magnitude in size (10-6 to 100 m). Macro-scale (10-1 to 100 m) karst features show vertical zonation, divisible into a karst cave zone, a fracture-dissolution zone, and a deep fracture zone. Meso-scale (10-3 to 10-1 m) analysis highlights the heterogeneity of the karst medium, indicating enhanced development of dissolution pores at depths of 9-12 m, 20-25 m, 34-40 m, and 47-49 m. At the micro scale (10-6 to 10-3 m), with the increase of buried depth, the number of solution cracks decreases, the number of cracks increases, and the extension degree increases. The morphological characterization parameters such as void radius, throat length and throat radius show that the parameter characteristics of 69 m depth are significantly different from those of 9-68 m. Based on this, the difference between the characteristics of fractures and dissolved pores is distinguished, and the buried depth of karst development bottom boundary is determined to be 69 m.Topography and geological structure are identified as the primary controls on intense karst development in the study area. First, the relatively gentle terrain slope favors rainfall infiltration over rapid surface runoff. Second, groundwater within the 15-27 m depth range, controlled by the local discharge base level, remains relatively active, fostering the formation of the sub-horizontal karst zone. Third, the combined influence of mild topographic and hydraulic gradients prevents rapid groundwater runoff, allowing sufficient time for water-rock interaction. Fourth, structural fractures within a fault zone extend to greater depths, enhancing vertical permeability and facilitating karstification down to 69 m. In contrast, outside the fault zone, where a well-developed fracture-dissolution zone is absent, the lower boundary of karst development is only approximately 27 m. The innovation of this study lies in its integrated, multi-scale (macro-, meso-, micro-) and multi-dimensional (surface, borehole, core) characterization of karst structures using a suite of technical methods. This approach effectively reveals the patterns of karst development and explores its controlling factors across different scales. The findings provide methodological insights and technical support for engineering geology and geological hazard assessment in karst regions. -
表 1 CT扫描测试岩心基本信息
Table 1. Information of drill cores for CT scan test
编号 岩心埋深/m 岩心长度/m A 27.8~27.9 0.14 B 42.4~42.6 0.20 C 46.7~46.9 0.21 D 47.5~47.7 0.24 E 54.6~54.9 0.30 F 68.1~68.3 0.21 G 69.5~69.7 0.24 表 2 岩心微结构特征数据
Table 2. Drill core microstructure parameters
岩心
编号平均空隙
半径μm平均空隙半
径中位数μm平均空隙
体积mm3平均喉道
半径μm平均喉道半
径中位数μm平均喉道
体积mm3平均
孔喉比平均
配位数平均
喉道长度平均空隙
形状因子平均喉道
形状因子平均
迂曲度A 59.97 156.41 0.022 38.86 93.80 0.001 2.24 2.71 176.91 0.029 0.312 2.54 B 56.51 741.55 0.053 27.26 149.35 0.003 2.43 3.03 120.66 0.029 0.031 2.41 C 91.34 820.04 0.121 58.35 331.36 0.028 3.53 0.85 175.09 0.030 0.031 1.84 D 110.37 2634.36 1.186 85.09 737.06 0.079 4.29 1.20 198.54 0.030 0.03 1.89 E 64.52 864.59 0.055 44.63 269.00 0.02 3.68 0.70 153.08 0.030 0.031 2.11 F 73.02 1100.00 0.071 41.21 500.90 0.013 3.52 1.07 147.54 0.031 0.031 2.20 G 80.86 1818.30 0.126 41.15 454.17 0.007 2.80 2.55 1752.48 0.030 0.031 2.48 注,表中“空隙”指包括溶隙、裂隙、颗粒间孔隙在内的所有空隙。 -
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