Ultrahigh arch dam foundation pit backfilling method

Abstract

The invention belongs to the technical field of water conservancy projects, and particularly relates to an ultrahigh arch dam foundation pit backfilling method. The method comprises the steps that thedam face of the extra-high arch dam is inspected, a foundation pit backfill area is partitioned and layered, foundation pit backfill materials, backfill elevation and backfill opportunities are preliminarily selected, and i foundation pit backfill schemes are determined; analyzing and comparing the seepage reduction effect, the heat preservation effect, the static load effect and the dynamic loadeffect of the i foundation pit backfill schemes; and an optimal elevation and a backfill opportunity are determined according to a comparison result, and an optimal foundation pit backfill scheme isselected. The method has the beneficial effects that the foundation pit backfilling method can reinforce bed rock cracks and enhance the seepage-proofing capacity of the dam; the dam body contact surface heat exchange coefficient is reduced, the dam surface heat preservation effect is improved, and temperature control and cracking prevention are facilitated; and the anti-seismic stability of the dam and the dam-foundation overall working performance in the construction period are improved.

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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