岩溶地层 meaning in Chinese

karstic formation

Design and construction of foundation piles of bridge in karst area
海底岩溶地层桥梁桩基施工
Technique in construction of large diameter pile foundation of hukou bridge in karst stratum
湖口大桥岩溶地层大口径桩基施工技术
Technical measures for constructing large diameter pie foundation in karst stratum of hukou bridge
湖口大桥岩溶地层大口径桩基施工的技术措施