Propagation and water inrush mechanisms of concealed karst fissures with consideration of mixed-mode I–II fracture toughness
MA Enlin1, LAI Jinxing2, WANG Wanfeng3, QIU Junling2
(1. School of Architecture and Civil Engineering, Xihua University, Chengdu, Sichuan 610039, China; 2. School of Highway, Chang'an University, Xi'an, Shaanxi 710064, China; 3. China Railway Construction Yunnan Investment Co., Ltd.,
Kunming, Yunnan 650200, China)
Abstract：Under the influence of natural geological forces, concealed karst fissures are primarily subjected to compressive-shear stress states. To establish an effective tensile-shear fracturing criterion, this study first identifies the critical conditions for the fracture of water-pressurized concealed karst fissures using the maximum tangential stress (MTS) criterion. Subsequently, a shear fracture criterion is formulated based on the Mohr-Coulomb strength theory. By referencing the dimensional form of the improved maximum energy release rate criterion and integrating the aforementioned tensile-shear fracture criteria, a composite fracture criterion (M criterion) is developed based on KIC and KIIC for I–II type fracturing. This criterion refines the MTS criterion when the II-type component predominates, addressing the limitation of the MTS criterion that considers only the tangential stress ?θ and uses KIC as the crack initiation threshold. It incorporates the shear stress component ?rθ and KIIC as well. Comparative analyses of M-criteria with different power exponents were conducted using the displacement discontinuity boundary element method, based on geological stress, rock parameters from Liangwangshan Tunnel tests, and field investigation results of karst fissures. Results validate that the proposed composite fracture criterion outperforms the MTS criterion in predicting critical conditions for fracture propagation, making it more applicable to water inrush problems involving karst fissure propagation under natural hydraulic pressure where compressive-shear stress is dominant.
马恩临1，赖金星2，王万锋3，邱军领2. 考虑I–II型断裂韧度的隐伏溶蚀裂隙扩展突水机制[J]. 岩石力学与工程学报, 2025, 44(7): 1808-1827.
MA Enlin1, LAI Jinxing2, WANG Wanfeng3, QIU Junling2. Propagation and water inrush mechanisms of concealed karst fissures with consideration of mixed-mode I–II fracture toughness. , 2025, 44(7): 1808-1827.
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2025, Vol. 44 
