Method for constructing foundation base of junction dam

A construction method and base technology, applied in infrastructure engineering, special data processing applications, instruments, etc., can solve problems that cannot meet engineering requirements, and achieve the effect of improving service life

Inactive Publication Date: 2016-11-09
CHONGQING JIAOTONG UNIVERSITY +1
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  • Claims
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Problems solved by technology

In previous studies, in order to simplify the problem, only one or two main factors were consid

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  • Method for constructing foundation base of junction dam
  • Method for constructing foundation base of junction dam
  • Method for constructing foundation base of junction dam

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] 1. Derivation of the scour depth formula in the sub-dam area

[0032] Such as figure 1 As shown, there are many factors affecting the local scour under the dam, which are generally summarized in two aspects: the water flow condition and the anti-scour capacity of the bedrock. Due to the impact of the dam body's sand retention, the discharge flow from the sluice gate is clear water, so the influence of a small amount of sediment contained in the discharge flow on the local scour depth under the dam is not considered.

[0033] Through the analysis of the definition of local dynamic bed scour under the dam, combined with some previous research status in this area, the main factors affecting the local scour depth under the dam with medium and low water head are summarized into the following two aspects:

[0034] 1. Water flow conditions include downstrea...

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Abstract

The invention discloses a method for constructing a foundation base of a junction dam. The method includes the steps that weak stratums in directly-bearing stratums of a middle-low water head dam are excavated out, and then the foundation base is excavated according to the burial depth of the middle-low water head dam. A method for determining the burial depth of the middle-low water head dam includes the following steps of a, determining the downstream water depth, the maximum discharge per unit width at the tail end of a protection apron and the upstream-downstream water level difference according to engineering design requirements, and initially calculating the theoretical burial depth of the middle-low water head dam; b, sampling, testing and analyzing bed rock in an area below the dam to obtain the anti-scouring flow speed of the bed rock; c, calculating the maximum scouring depth of the area below the dam in the natural state; d, correcting the theoretical burial depth of the middle-low water head dam according to the scouring depth of the area below the dam, and determining that the burial depth of the middle-low water head dam is the sum of the scouring depth and the theoretical burial depth. The method has the advantages that the scouring depth of the local portion below the dam can be accurate foreseen, the burial depth of a hydraulic structure can be reasonably set, and the service life of a hydroelectric junction project can be prolonged.

Description

technical field [0001] The invention relates to the protection field of medium and low water head dams, in particular to a base construction method of pivotal dams. Background technique [0002] With the increasing number of barrage and dam projects in our country, the problems caused by the construction of hydropower projects have also attracted more and more attention. In hydropower projects with medium and low water heads, there is a certain water level difference between the upstream and downstream water levels, and the discharged water often has a large flow rate and carries a large amount of energy. If these huge energies are not dissipated, they will scour the downstream riverbed and river bank, and most of the coverage of the downstream river section is formed by alluvial, with poor insect resistance, the riverbed will be scoured into pits. When these scoured pits If the location is too close to the hydraulic structure and the pit depth is large, it will cause damag...

Claims

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Application Information

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IPC IPC(8): G06F17/50E02D27/40
CPCE02D27/40G06F30/13G06F30/367
Inventor 倪志辉吴立春张绪进郭毅
Owner CHONGQING JIAOTONG UNIVERSITY
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