Method for Determination of Critical Water Pressure and Critical Thickness of Three-dimensional Water Inrush Failure of Tunnel Inverted Arch

Abstract

The invention discloses a determining method of the critical water pressure and the critical thickness during tunnel invert three-dimensional water inrush destruction. The determining method mainly comprises the steps that firstly, the geometrical relationship between three-dimensional water inrush destruction surfaces is calculated, then the water pressure external force power, the water-resisting layer weight external force power and the internal energy dissipation power are calculated correspondingly, and finally, according to the situation that the external force power is equal to the internal energy dissipation power, the critical water pressure during invert water inrush destruction when the thickness of a water-resisting layer is known is determined; or the critical thickness of the water-resisting layer is determined when the water pressure of a water-containing layer is known. According to the determining method, the calculation method is provided for determining the critical water pressure and the critical thickness during tunnel invert three-dimensional water inrush destruction; whether water inrush occurs to a tunnel invert or not and whether the thickness of the water-resisting layer meets the requirements or not can be judged accordingly, and a foundation is provided for water releasing and pressure reduction; for example, under the high water pressure, the water pressure is lowered below the critical water pressure, and water inrush can be effectively prevented from occurring; and meanwhile, the determining method can determine the shape of a three-dimensional destruction surface during tunnel invert water inrush destruction.

Description

technical field [0001] The invention belongs to the technical field of prevention and control of tunnel water inrush damage, and in particular relates to a method for determining the critical water pressure and critical thickness of tunnel inverted three-dimensional water inrush damage. Background technique [0002] With the construction of dedicated passenger lines and high-grade highways in my country, more and more long tunnels have been built. These long tunnels pass through a variety of complex and special geological landforms and structural units, and are in different stress fields, seepage fields, and temperature fields, and various geological disasters will occur. Among them, tunnel water inrush or even mud inrush is one of the most harmful disasters in tunnel engineering, such as the Maluqing Tunnel on Yiwan Railway and the water inrush disaster in Yeshanguan Tunnel, which caused heavy losses to the project. Therefore, it is of great engineering significance and sc...

AI Technical Summary

Problems solved by technology

[0003] At present, numerical simulation or empirical formulas are mostly used to determine the critical thickness of tunnel water inrush, and the formula of the rupture surface is assumed. There are few studies on the critical water pressure of water inrush, and there are few studies from the perspective of energy conservation.

At the same time, most of the research on water inrush in tunnels is the water inrush from the face of karst tunnels, and there are few reports on the research on water inrush from tunnel inversions.

Images