Control system for dam foundation stratum uplift deformation

A technology of lifting deformation and base, applied in the direction of infrastructure engineering, protective devices, buildings, etc., can solve problems such as uncoordinated deformation of retaining dams, adverse effects on the stability of reservoir bank slopes, and endangering the safety of dams, etc. The effect of uneven settlement, simple structure and convenient operation

Active Publication Date: 2015-07-22
POWERCHINA ZHONGNAN ENG
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  • Claims
  • Application Information

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Problems solved by technology

This deformation may have an adverse effect on the stability of the reservoir bank slope, and may also cause uncoordinated deformation of the retaining dam, thereby forming new additional stress in the dam structure and endangering the safety of the dam

Method used

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  • Control system for dam foundation stratum uplift deformation
  • Control system for dam foundation stratum uplift deformation

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Embodiment Construction

[0020] A control structure for the deformation of the dam foundation strata, such as figure 1 As shown, a pressure relief corridor 2 is set in the retaining dam 1, and a pressure relief hole 4 is arranged in the dam foundation layer through the pressure relief corridor. The length 5 of the pressure relief hole passing through the relatively impermeable layer 7 is about 5-10m. Plastic blind pipe 11 is installed in pressure relief hole 4 holes, as figure 2 As shown, the blind pipe is wrapped with a geotextile 12 to prevent the dam foundation from seeping damage along the pressure relief hole 4 and reducing the bearing capacity of the dam foundation. The present invention reduces the excessive osmotic pressure accumulated in the permeable rock mass 8 below the relatively impermeable layer 7 through the pressure relief hole 4, reduces the osmotic water pressure acting on the relatively impermeable layer 7 and the permeable layer 6, and realizes the control or reduction of the dam...

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Abstract

The invention discloses a control structure for dam foundation stratum uplift deformation. The control structure comprises a dam arranged on a dam foundation and a seepage-preventing curtain arranged below the dam foundation. The part below the dam foundation comprises a permeable stratum, a relatively non-permeable layer and a permeable rock stratum in sequence from top to bottom. A pressure relief gallery and multiple pressure relief holes are formed inside the dam, the pressure relief holes are formed inside the dam foundation, the top ends of the pressure relief holes are communicated with the pressure relief gallery, and the bottom ends of the pressure relief holes are located inside the permeable rock stratum. Stratum seepage force distribution and deep-layer water-drainage pressure relief controlling the stratum to generate seepage deformation are changed, and therefore stratum uplift deformation caused by water storage of a reservoir is reduced or eliminated.

Description

technical field [0001] The invention relates to a structure for controlling the deformation of a dam base layer uplift, which belongs to the field of water conservancy and hydropower engineering, and in particular aims at the deformation control of the uplift of a dam foundation in a water conservancy and hydropower engineering. Background technique [0002] The uplift deformation caused by reservoir impoundment is a unique formation deformation phenomenon in international and domestic hydropower projects. The reservoirs of Tongjiezi and Jiangya hydropower stations in China have experienced different degrees of uplift and deformation after impoundment. [0003] No effective solution has been proposed so far for this deformation. Based on relevant domestic and foreign literature reports, the stratum structures that cause stratum uplift and deformation induced by reservoir impoundment are all geological structures with relatively impermeable layers distributed in permeable str...

Claims

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Application Information

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IPC IPC(8): E02D27/40E02D31/10
Inventor 冯树荣蒋中明钟辉亚王江营李学政曾祥喜李跃
Owner POWERCHINA ZHONGNAN ENG
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