A method of backfilling the foundation pit of an extra-high arch dam

Abstract

The invention belongs to the technical field of water conservancy engineering, and in particular relates to a method for backfilling an extra-high arch dam foundation pit. The method includes: inspecting the dam surface of an extra-high arch dam, partitioning and stratifying the backfill area of ​​the foundation pit, initially selecting the backfill material, backfill elevation and backfill timing of the foundation pit, and determining i foundation pit backfill schemes; analyzing and comparing the Describe the seepage reduction effect, thermal insulation effect, static load effect and dynamic load effect of i foundation pit backfill schemes; determine the optimal elevation and backfill timing according to the comparison results, and select the optimal foundation pit backfill scheme. The beneficial effects of the present invention are: the foundation pit backfilling method can reinforce the cracks in the bedrock, enhance the anti-seepage ability of the dam; reduce the heat exchange coefficient of the contact surface of the dam body, increase the heat preservation effect of the dam surface, and be beneficial to temperature control and crack prevention; improve construction The seismic stability of the dam in the long term and the overall working behavior of the dam-foundation.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and in particular relates to a method for backfilling an extra-high arch dam foundation pit. Background technique [0002] Since the construction of Ertan High Arch Dam with a dam height of 240m in the 1990s, the construction of ultra-high arch dams in China has achieved rapid development. A number of 300m-level ultra-high arch dams such as Xiaowan, Jinping I and Xiluodu have been built successively, and their construction is more difficult than High arch dams such as Ertan, Laxiwa, and Goupitan have stepped up to a new level. The scale of the project is larger, and the stress conditions of the dams in each stage of construction and operation are more complex. [0003] During the construction period, the extra-high arch dam is affected by the overhang and constraints, and the stress distribution of the dam body is dynamically adjusted. When the dam is poured to a certain he...

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Problems solved by technology

[0004] At present, there are few reports at home and abroad on the mechanism of backfilling the upstream foundation pit of extra-high arch dams on the dam's action mechanism. The existing research focuses on the influence of foundation pit backfilling on the stress and deformation of the dam, without considering the anti-seepage of the backfill body , thermal insulation, there is still a lack of systematic analysis of the mechanism of the backfill soil-rock mixture on the dam

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