TY - JOUR A2 - Feng, Gan AU - Zhang, Quan AU - Wang, Jiong AU - Feng, Longfei PY - 2021 DA - 2021/06/16 TI - Mechanical Mechanism of Hydraulic Fracturing Effect Caused by Water Inrush in Tunnel Excavation by Blasting SP - 9919260 VL - 2021 AB - When the deep tunnel is excavated, the pressure of the confined water is relatively high, causing the water inrush to have a hydraulic fracturing effect. The method of theoretical analysis was adopted to study this effect. A mechanical model for fracturing water inrush under blasting excavation conditions was established. The water inrush under this condition is the result of the combined action of static load (water pressure and in situ stress) and dynamic load (explosive stress wave). According to whether the normal stress on the hydraulic crack surface was tensile stress or compressive stress, two types of water inrush were proposed: water inrush caused by tensile-shear damage and water inrush caused by compression-shear damage. These two types of critical water pressures were calculated separately. The relationship between critical water pressure, in situ stress, and blasting disturbance load was given, and a pore water pressure splitting factor was introduced in the calculation process. The theoretically obtained critical water pressure had been verified in the case of water inrush in a deep-buried tunnel. The established theory can guide field practice well. SN - 1024-123X UR - https://doi.org/10.1155/2021/9919260 DO - 10.1155/2021/9919260 JF - Mathematical Problems in Engineering PB - Hindawi KW - ER -