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Earth and rockfill dam foundation deep soft soil treatment method and earth and rockfill dam

A technology for soft soil treatment and earth-rock dams, which is applied in the direction of infrastructure engineering, filling, dams, etc., can solve problems such as difficulties in the construction of high earth-rock dams, and achieve the effects of shortening the construction period, reducing the scope of excavation, and saving engineering volume

Pending Publication Date: 2021-06-29
POWERCHINA HUADONG ENG COPORATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the earth-rock dams built or under construction at home and abroad have not exceeded 55.0m, and the soft soil thickness of dam foundations is generally within 20-25m. For deep soft soil foundations (35-40m), high earth-rock dams There are still great difficulties in the construction

Method used

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  • Earth and rockfill dam foundation deep soft soil treatment method and earth and rockfill dam
  • Earth and rockfill dam foundation deep soft soil treatment method and earth and rockfill dam
  • Earth and rockfill dam foundation deep soft soil treatment method and earth and rockfill dam

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Effect test

Embodiment 1

[0039] Embodiment 1: This embodiment is a deep soft soil treatment method for an earth-rock dam foundation, comprising the following steps:

[0040] Before construction, the excavation surface of the dam foundation is determined according to the site conditions and the design requirements of the dam. The excavation surface of the dam foundation is in the shape of a groove as a whole. The bottom surface of the tank and the downstream tank walls are slopes that slope downward toward the bottom of the tank;

[0041] Before the excavation of the soft soil of the dam foundation, the construction of vibratory gravel piles is carried out on the foundations upstream and downstream of the anti-seepage body of the dam. Stones are only backfilled with gravel below the excavation surface of the dam foundation, and gravel piles are formed below the excavation surface of the dam foundation (the gravel piles are mainly arranged for the soft soil layer, if the soft soil layer is not distribut...

Embodiment 2

[0082] Embodiment 2: This embodiment is basically the same as Embodiment 1. The only difference is that the excavation of the dam foundation can be carried out in two phases. The second phase of excavation was carried out.

[0083] Such as Figure 18 As shown, in this embodiment, the covering layer above the soft soil layer is excavated to a certain depth before the construction of the vibrating gravel pile, and the excavation area is the area covered by the dam body.

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Abstract

The invention relates to an earth and rockfill dam foundation deep soft soil treatment method and an earth and rockfill dam. The earth and rockfill dam foundation deep soft soil treatment method comprises the steps that a dam foundation excavation face is determined, the whole dam foundation excavation face is in a groove shape, a groove bottom face corresponds to the part of a dam anti-seepage body and is deep below a soft soil layer, and groove walls on the upstream portion and downstream portion of the groove bottom face are slopes inclining downwards towards the groove bottom; and before dam foundation soft soil is excavated, vibro-replacement gravel pile construction is conducted on upstream and downstream foundations of the dam anti-seepage body on the upper portion, pile holes penetrate through the dam foundation excavation face, only the holes are formed above the dam foundation excavation face, gravel is not backfilled, the gravel is only backfilled below the dam foundation excavation face, and gravel piles are formed below the dam foundation excavation face. If the soft soil below the excavation face is not treated, a soft soil slope cannot be stable, and the construction difficulty is also very high; moreover, the difficulty of excavation of common deep soft soil is very high, so that the stability of an excavation slope can be ensured only after the gravel piles are firstly used for treatment, and a dam core anti-seepage body is placed on a non-soft soil foundation during excavation.

Description

technical field [0001] The invention relates to an earth-rock dam foundation deep soft soil treatment method and an earth-rock dam. It is suitable for the treatment of deep and thick soft soil of earth-rock dam foundations in water conservancy projects. Background technique [0002] The earth-rock dam is the dam type with the longest history of dam construction, and it is also the most widely used dam type because of its outstanding advantages such as strong foundation adaptability, dam materials obtained locally, and good economy. When (after treatment) the requirements for deformation, shear strength, seepage stability and seepage are met, the earth-rockfill dam can use the covering layer as the dam foundation. Over 70 meters of gravel overburden. However, for some special soil foundations, such as soft soil foundations, due to their low water permeability, high compressibility, low shear strength, high sensitivity, and poor engineering characteristics, usually only low ...

Claims

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Application Information

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IPC IPC(8): E02B7/06E02D17/18E02D3/08
CPCE02B7/06E02D3/08E02D17/18
Inventor 吴伟伟徐建军郑南孙来刘西军郑惠峰王栋良
Owner POWERCHINA HUADONG ENG COPORATION LTD
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