Treatment method of peat soil dam foundation

Abstract

The invention relates to a treatment method of a peat soil dam foundation. For the dam section of a clay core-wall rockfill dam, gravels are scattered so as to enhance bearing capability, a pump pit is arranged for draining, and consolidation grouting and curtain grouting are carried out so as to ensure the stability and permeability of the dam foundation. For the dam section of a homogeneous soil dam, a pipe culvert and a draining ditch are buried, peat soil is cleared after draining and airing, a transition section is built after a residual soil layer is air-dried, and finally, ramming is carried out. For the dam section of an earth-rock dam, a cofferdam is built at the upstream section for blocking water, a draining open canal is dug for drainage, and rock powder is scattered for increasing soil strength; and finally, rock is thrown at the downstream side, and a gallery is built, so that clearing equipment can be driven into marshland for clearing the peat soil. According to the treatment method, the digging and outward transporting of the peat soil are facilitated, and the dam foundation meets seepage preventing requirements; the investment of special desilting equipment and the arrangement of a seepage preventing wall are avoided, and at the same time, large-area soil replacement is avoided; and when construction quality is ensured, the construction cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of soft dam foundation treatment, in particular to a treatment method for peat soil dam foundations. Background technique [0002] The main dam of the Subre Hydropower Station has a total length of about 4.5km and a maximum dam height of about 20.5m. There are three main types of dams, namely core rockfill dam, homogeneous earth dam and earth-rock mixed dam. The spillway is arranged on the riverbed, and most of the other buildings are arranged on both banks. The foundation surfaces of the spillway and the powerhouse are bedrock, and the rest of the dam sections are built on the overburden. During the on-site construction, the axis of the dam passed through several perennial swampy areas formed by rainfall, and the area faced many problems such as difficulty in accessing dredging equipment, drainage, removal, and filling time. [0003] The site is located in a plain area under a tropical rainforest climate...

AI Technical Summary

Problems solved by technology

And if the peat soil in the natural state is transported by dump truck, it will be missed. The peat soil is rich in humus and has a strong odor, which will have a certain impact on the environment.

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