Method for predicting seepage field of nodal region of earth and rockfill dam and determining infiltration side of earth and rockfill dam

Abstract

The invention discloses a method for predicting the seepage field of a nodal region of an earth and rockfill dam and determining the infiltration side of the earth and rockfill dam. The method includes establishing a nodal-region three-dimensional geological detailed model of an unfavorable geologic body and fractures; setting up three-dimensional seepage and computing a grid model on the basis of the three-dimensional geological detailed model; simulating numerical values of the seepage field of the earth and rockfill dam on the basis of the three-dimensional geological detailed model, dispersing by the finite volume method according to the determined continuity equation, the water and steam two-phase N-S equation, the water and steam two-phase mixing speed equation and mixing density equation, the set boundary conditions and the seepage parameters of the actual project, solving with the SIMPLE algorithm, realizing numerical simulation of the seepage field of the earth and rockfill dam on the basis of the three-dimensional geological detailed model and thereby predicting the seepage field of the nodal region of the earth and rockfill dam. Geological information can be accurately reflected, and the seepage field of the nodal region of the earth and rockfill dam can be accurately simulated. Meanwhile, the seepage field is utilized to determine the infiltration side of the earth and rockfill dam by the VOF (volume of fluid) method.

Description

technical field [0001] The invention belongs to the field of numerical simulation of seepage field in hydropower engineering, and relates to a numerical simulation method for seepage field of earth-rock dams based on a three-dimensional fine geological model. Specifically, it involves the construction method of fine geological models including unfavorable geological bodies and fractures, the numerical simulation method of seepage field of earth-rock dams based on fine geological models, and the method of solving the seepage surface of earth-rock dams. Background technique [0002] In water conservancy projects, water damage to engineering facilities is the most important aspect affecting engineering safety. Among them, the effect of groundwater on water conservancy projects is not easy to observe, and once discovered, it is difficult to recover, which often brings major safety problems and economic losses to the project. [1] . Therefore, water conservancy projects are very...

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Problems solved by technology

In the seepage simulation process of earth-rock dams, in view of the complex and uncertain geological conditions and fractures, it is difficult to establish accurate geological and fracture models, so the actual geological conditions are often greatly simplified, which will obviously greatly reduce the simulation The precision of the result

In addition, the current method commonly used in seepage calculation is the finite element analysis method, which equates the temperature field to the seepage field, or uses Darcy's law to solve the seepage field, which has many application restrictions and cannot effectively and accurately determine the position of the wetting surface

For the simulation of the wetting free surface of pressureless seepage, the finite element fixed mesh method is mostly used. Although this method has good adaptability to complex areas, because the position of the wetting free surface is to be obtained and unknown in advance, it needs to be determined iteratively. The element fixed grid method affects the calculation accuracy of the seepage field

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