Method for calculating underground water seepage flow based on equipotential surface

Abstract

The invention discloses a method for calculating underground water seepage flow based on an equipotential surface. The method comprising the following steps: (1.1) solving a seepage field, namely solving the seepage field by adopting the conventional finite element method and solving the water head values of the nodes of each unit; (1.2) determining the water head value of the equipotential surface, defining the water head value of the equipotential surface to be determined as h0, and forming the equipotential surface by the nodes with the same water head value; and (1.3) executing the step (1.3.1) on any unit or a unit No. ie in the seepage field, wherein the step (1.3.1) includes that the relations between the water head values of the nodes and h0 are judged. The method disclosed by the invention is a new method which solves the underground water seepage flow by utilizing a finite element and has the advantages that integral is directly carried out on the equipotential surface, the section through which water flows is vertical to the flow direction, no component interference is produced and calculation accuracy is high. The flow passing through the equipotential surface of the water head is in just one direction, thus avoiding that not only the direction of gradient of the water head but also the direction of an area vector are required to be determined in a middle section method.

Description

technical field [0001] The invention belongs to the technical field of groundwater control in water conservancy projects, and relates to numerical simulation technology for groundwater seepage engineering, in particular to a calculation method for solving groundwater seepage flow by using finite elements. Background technique [0002] Seepage is a kind of groundwater movement. When there is a water level difference in a building and its foundation, groundwater will flow from a place with a high water level to a place with a low water level, forming seepage. Seepage is a subject that is closely related to hydraulics and rock and soil mechanics. With the continuous development of modern science and technology, seepage has been greatly developed in basic theory, test methods, calculation methods and applications, and has gradually become a subject. As a specialized discipline, it has been able to solve various complex engineering problems. The seepage of earth-rockfill dams un...

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Problems solved by technology

This method needs to assume the distance L between the centroids of the two planes, and the calculation section needs to be subdivided again. Iterative method is needed to solve the local coordinates in the unit coordinate system of the unit that the centroid of the section unit passes through in the overall area, and the calculation time is relatively long. , theoretically, the hypothetical plane centroid distance L also affects the calculation accuracy of the flow rate

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