Research on Hydraulic Fracture of Rock Mass in the Fault Zone of High-pressure Branch Pipe
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Abstract:
Hydraulic fracture may occur in the surrounding rock of deep-buried tunnel under high water pressure, especially in the fault and its influencing zones The results of high water pressure test before and after the grouting in the fault and its influencing zones of a pumped storage power station showed that the pressure of hydraulic fracture increases obviously after the grouting, but the hydraulic fracture pressure value of about 17% of test section rock mass is less than or equal to the hydrostatic pressure in the diversion penstock. However, the results of water-filling test indicated that there is no hydraulic fracture in the fault and its influencing zones, which may be due to that: (1) the absolute values of increased pressure may not be appropriate to determine the occurrence of hydraulic fracture, and the relative values of increased pressure should be used; (2) although the water pressure is high in the pipe, there is head loss when water leaks from reinforced concrete into wall rock grouting zone, resulting in lower water pressure than the hydrostatic pressure in the pipe; and (3) the secondary hydraulic fracture of rock mass.
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