Method for detecting instability risk ratio of slope of high no-overtopped rockfill cofferdam

A technology for slope instability and detection methods, which is applied in special data processing applications, instruments, electrical digital data processing, etc.

Active Publication Date: 2016-01-27
POWERCHINA CHENGDU ENG
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Problems solved by technology

Some scholars use the Monte-Carlo method to calculate the instability risk of multi-factor cofferdam slopes, but do not consider that the position of the most dangerous sliding surface changes in each simulation calculatio

Method used

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  • Method for detecting instability risk ratio of slope of high no-overtopped rockfill cofferdam
  • Method for detecting instability risk ratio of slope of high no-overtopped rockfill cofferdam
  • Method for detecting instability risk ratio of slope of high no-overtopped rockfill cofferdam

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Embodiment approach

[0090] A large-scale hydropower project in Southwest China is a concrete double-curvature arch dam with a crest elevation of 610.00m, a maximum dam height of 278.00m, a normal reservoir storage level of 600.00m, and a flood limit water level of 560.00m. The design elevation of the crest of the upstream cofferdam is 436.00m, the maximum weir height is 78.00m, and the upstream water level is 434.16m. The hub project is a first-class project with a huge project scale, the service life of the diversion building is long, and the storage capacity formed by the cofferdam is 250 to 400 million m 3 , After the cofferdam crashes, it will cause heavy losses to the engineering construction, so the level of the diversion building is selected as Ⅲ level. For Class III diversion structures, the corresponding design flood standard for earth-rock cofferdams is a return period of 20 to 50 years, K G Take the value 1.3 according to relevant specifications. This project comprehensively studies ...

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Abstract

The invention relates to a water conservancy and hydropower engineering construction diversion risk analysis technology, aims at defects of detection of an instability risk ratio of a slope of a high no-overtopped rockfill cofferdam in the conventional technology, and provides a method for detecting the instability risk ratio of the slope of the high no-overtopped rockfill cofferdam. The method comprises the following steps of (1) comprehensively considering randomness of hydrological, hydraulic and filled earth-rock mechanical parameters and constructing a mathematic module for the instability risk ratio of the slope of the high no-overtopped rockfill cofferdam based on a safety factor; (2) adopting an Monte-Carlo method to couple each randomness factor to ascertain probability distribution of a maximum water level in front of the cofferdam; (3) adopting a layered-LHS sampling method to obtain a filled earth-rock random parameter sample to improve sampling efficiency; (4) utilizing a K-S inspection principle to judge an acceptable distribution type of the safety factor of the slope; and (5) adopting a goodness-of-fit index to determine the optimum probability distribution and computing the risk ratio. The method is suitable for a water conservancy and hydropower engineering construction diversion risk decision.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower project construction diversion risk decision-making, and in particular relates to a method for detecting the risk rate of instability of a cofferdam slope with high soil and rocks. Background technique [0002] In the construction process of water conservancy and hydropower projects, construction diversion is one of the key links throughout the whole process of water conservancy and hydropower project construction. Power generation period, etc., affect the whole process of project construction. As we all know, most of the hydropower projects in Southwest China are located in deep mountains and canyons, and the flood level changes greatly during the flood season. The high earth and rock cofferdams will undoubtedly become the most competitive type of water retaining cofferdams, such as Xiluodu, Baihetan, Wudongde, Lianghekou, It is widely used in giant hydropower projects s...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 张超
Owner POWERCHINA CHENGDU ENG
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