At the Zhangjiazai Reservoir dam site in Guizhou, China, the coupled influence of karst processes and igneous intrusions has produced multiple deep weathering troughs, which pose significant challenges to the engineering construction. Through surface geological mapping, test pits and trenches, drilling, geophysical surveys, and geotechnical testing, three longitudinal troughs formed by karst and weathering on the left abutment, and one trough with a lateral orientation on the right abutment are identified. These features arise from two coupled mechanisms: coupling among tectonics, igneous intrusion, and karst; and differential weathering along intrusion contacts combined with tectonics and topography. We establish a management framework for different trough types that includes targeted investigation, classification driven treatment, and dynamic monitoring, and we propose differentiated mitigation measures. After curtain grouting, downstream springs dried up, indicating a clear improvement in cutoff performance, and the dam foundation meets stability requirements. The results provide a useful reference for similar engineering projects.
Yu Jiasong
,
Guo Guo
,
Wu Denghao
. Characteristics and Treatment Measures of Deep Weathering Troughs Caused by Igneous Rock Intrusion in Karst Areas[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(S2)
: 933
-939
.
DOI: 10.20174/j.JUSE.2025.S2.47
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