Method for eliminating clamp effect on seepage-proofing film anchoring part of high film faced rockfill dam by compensating displacement

Abstract

The invention provides a method for eliminating a clamp effect on a seepage-proofing film anchoring part of a high film faced rockfill dam by the compensating displacement principle aiming at a problem that the anchoring part at the periphery of the seepage-proofing film on an upstream dam face has high possibility of generating the clamp effect which can damage the film after the reservoir storage of the high film faced rockfill dam is completed. The method comprises the following steps: arranging a film anchoring line to be lower than a dam face film laying line; using a flat section of a toe slab as a film placing region to enable a dam face seepage-proofing film to be laid to enter an anchoring device from top to bottom conveniently; indenting an anchoring basal plane of a concrete toe slab to the inclined surface of the toe slab (on the seepage-proofing downstream side), and forming a small cavity at the upper part of the dam face film laying line to effectively reduce displacement of a dam body material at the anchoring part and to accommodate the film above the film laying line when the film laying line moves to the anchoring line after the reservoir storage of the dam is completed. According to the invention, stainless steel anchoring compressing parts are adopted to enable distance between fastening bolts to be increased by 0.5-1 time so as to accelerate construction speed; anchoring basal planes are coated with soft sealant, so that water can be stopped, and particles are prevented from entering to ensure that the film is free of damage when the film laying line moves to the anchoring line.

Description

technical field [0001] The invention relates to a method for preventing an anti-seepage membrane at an anchorage from being damaged due to a clamp effect by using the principle of displacement compensation, and belongs to the technical field of membrane anti-seepage structures of high-membrane rockfill dams. Background technique [0002] Reservoir dams are important structures in the field of water resources development. Due to different dam materials, they are mainly divided into concrete dams and earth-rock dams. Earth-rock dams are the majority because of the characteristics of using local materials and low requirements for the foundation of the dam site. The anti-seepage body in high rockfill dams mainly adopts cohesive soil core wall or reinforced concrete face plate, but when the foundation of the dam site is a deep covering layer, only clay core wall (or inclined core wall) can be used to connect the foundation concrete anti-seepage The type of wall. Rockfill dams wi...

AI Technical Summary

Problems solved by technology

However, complex boundary conditions lead to complex technological processes that make it difficult to implement. In addition, in order to prevent gravel from entering the "box", the channel between the inside and outside of the anchoring groove can only be slightly larger than the thickness of the membrane, forming the "free space" of the anchoring groove. The shell of the "box" must be a reinforced concrete structure with high strength, and the construction can only be carried out after the membrane is anchored, and the construction is extremely difficult and the anchored membrane is easily damaged.

Therefore, difficult-to-implement designs often lead builders to abandon the entire design proposal

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