Seepage safety evaluation method based on reduction coefficient

Abstract

The invention relates to a seepage safety evaluation method based on a reduction coefficient. The method comprises the steps that 1, an upstream water level H(up) and a downstream water level H(down) of a gate dam and a water level H1 of an osmometer behind a diaphragm wall are collected, wherein the gate dam is built on a covering layer; 2, a formula is adopted to calculate a diaphragm wall reduction coefficient; and 3, if a diaphragm wall reduction coefficient allowed value is determined, three-dimensional finite element analysis is performed, a calculation result of the osmometer behind the diaphragm wall is calculated, and a diaphragm wall reduction coefficient calculated value is solved to serve as a fundamental basis of a seepage safety allowed value. According to the method, through three-dimensional finite element analysis, the calculation result of the osmometer behind the diaphragm wall is calculated, and the diaphragm wall reduction coefficient calculated value is solved to serve as the fundamental basis of the seepage safety allowed value. The seepage safety evaluation method based on the reduction coefficient is simple and high in accuracy.

Description

technical field [0001] The invention belongs to the field of foundation gates and dams with deep overburden layers, and in particular relates to a seepage safety evaluation method based on a reduction coefficient. Background technique [0002] The deep overburden of the river bed refers to the Quaternary loose deposits accumulated in the river valley with a thickness greater than 40 meters. The deep overburden of the river bed in Southwest China, especially in Tibet, is widely distributed, generally with a thickness of more than 100 meters. In some areas The thickness can range from 300 to 600 meters, and it has the characteristics of preservation integrity, diversity and typicality. In actual engineering practice, due to the limitation of topographical and geological conditions, it is often necessary to build gravity-type concrete with water-retaining function on deep covering layers gate dam. [0003] The complex and unfavorable foundation conditions of deep overburden ha...

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Problems solved by technology

[0004] When designing the seepage safety monitoring of dams with deep overburden, it is considered that the monitoring of seepage flow is not necessary, and it is necessary to add seepage intercepting walls and water measuring weirs, which will lead to a substantial increase in project investment

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