Method for calculating hydraulic characteristics in rock plug blasting water-gas transition process

Abstract

The invention discloses a method for calculating hydraulic characteristics in a rock plug blasting water-gas transition process. Aiming at a rock plug body rear tunnel as a non-pressure open channelflow, according to the flowing characteristics of actual gas and liquid in a water conveying pipeline in which water and gas flow in two phases, a blasting engineering water delivery system establishes a mathematical model consisting of a water-gas two-phase flow continuity equation, a flow and water level relation equation, a water head balance equation, a ventilation shaft exhaust equation, an ideal gas state equation and the like; the hydraulic characteristics of the rock plug blasting water-gas transition process can be calculated through simultaneous establishment of the equations, and the change process of the hydraulic characteristics such as the exhaust process, the gas pressure, the water body pressure, the gas quality and the surge height of a rock plug blasting engineering waterconveying pipeline and a ventilation building can be obtained through analog calculation. The mathematical model provided by the invention realizes accurate calculation of the hydraulic characteristics of the water-gas transition process of the water pipeline in the rock plug blasting engineering, and provides a theoretical basis for the design and safe operation of the rock plug blasting engineering.

Description

technical field [0001] The invention belongs to the field of numerical calculation of hydraulic characteristics of water-gas two-phase flow in long-distance water supply pipelines, and in particular relates to a calculation method of hydraulic characteristics in the water-gas transition process of rock plug blasting. Background technique [0002] Rock plug blasting is a kind of underwater controlled blasting. It is to build a tunnel entrance on the already built reservoir or slope protection. After the construction of the tunnel is completed, blast the rock plug to make the reservoir and the tunnel can be connected smoothly. Underwater rock plug blasting has been applied in many projects at home and abroad due to the advantages of short construction period, high work efficiency, low investment, and construction without external influence. In the blasting dynamics of rock plug blasting, the main performance is: the blasting shock wave generated by the blasting produces a pres...

AI Technical Summary

Problems solved by technology

However, due to the fact that the water pipeline is filled with water flow and the pipeline is in a pressurized state, the water hammer pressure generated during the actual blasting is too large and the negative pressure is severe, which may cause serious damage to the water transmission system and buildings. For problems related to plug blasting, blasting should be carried out when the water delivery pipeline is an open channel with no pressure flow, that is, the pipeline is not completely filled with water. However, no research has been carried out on the pressure change in the water-gas transition process after rock plug blasting, so engineers and technicians cannot directly apply relevant formulas to calculate the change of hydraulic characteristics of water pipelines in rock plug blasting projects

Images