Seepage-proofing method for deep cover layer

A technology of deep overburden and overburden, applied in water conservancy projects, sea area engineering, infrastructure engineering, etc., can solve the problems of increased project investment and little necessity of seepage flow monitoring, and achieve short construction period, convenient construction, and anti-corrosion Visible effect of seepage effect

Inactive Publication Date: 2017-08-15
POWERCHINA XIBEI ENG +1
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AI Technical Summary

Problems solved by technology

[0004] When designing the seepage safety monitoring of dams with deep overburden, it is considered that the monitoring of seepage flow is not necess

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] An anti-seepage method for deep overburden, the method comprising:

[0021] 1) Divide rock formations and determine seepage parameters; carry out in-situ tests on surface rock formations, and carry out indoor seepage deformation tests of upper covering layers on deep rock formations to determine the permeability characteristics of covering layers;

[0022] 2) Construction shall be carried out with seepage slope as the mainstay and seepage amount as supplementary;

[0023] 3) The arrangement of the cutoff wall adopts the form of short connecting plate + cutoff wall for anti-seepage. If the foundation rock group is distributed in rhyme bands and there is an impermeable layer with a thickness greater than 5m and a permeability coefficient of 1*10-5cm / s, it will be used as a suspension The backing layer of anti-seepage wall.

[0024] 4) Use sheet piles and concrete anti-seepage walls that withstand large hydraulic gradients as hanging curtains, and prepare anti-filtration ...

Embodiment 2

[0026] An anti-seepage method for deep overburden, the method comprising:

[0027] 1) Divide rock formations and determine seepage parameters; carry out in-situ tests on surface rock formations, and carry out indoor seepage deformation tests of upper covering layers on deep rock formations to determine the permeability characteristics of covering layers;

[0028] 2) Construction is carried out with seepage slope as the mainstay and infiltration amount as the supplement. During the construction, the safety of seepage slope and concrete indirect contact erosion is emphasized. The contact surface between the bottom of the dam and the foundation adopts the vertical anti-seepage form; the vertical anti-seepage forms include: If the depth of the anti-seepage wall is greater than 40m, the thickness of the anti-seepage wall is greater than 1m, and the anti-seepage wall is embedded in the bedrock by 1m to 4m, the slot method is adopted; if the covering layer contains blocks with a maxim...

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Abstract

The invention relates to a seepage-proofing method for a deep cover layer. The seepage-proofing method comprises the following steps of: 1) dividing formation complex and determining seepage parameters; 2) performing construction by taking seepage slope as a main role and taking permeability as a subsidiary role; and 3) arranging seepage-proofing walls by adopting a seepage-proofing mode of short connecting plates and the seepage-proofing walls. According to the seepage-proofing method, the formation complex is divided and the seepage parameters of the cover layer are determined for judging and analyzing which form of piping erosion and flowing soil of rock-soil belongs to, construction is performed by taking seepage slope as the main role and taking permeability as the subsidiary role according to the seepage parameters of the cover layer, and the seepage-proofing walls are arranged by adopting the seepage-proofing mode of short connecting plates and the seepage-proofing walls, so that the seepage-proofing method has the characteristics of a short construction period, convenient construction and a good seepage-proofing effect. The seepage-proofing method performs seepage-proofing treatment on the deep cover layer in aspects of early-stage geological exploration and test, parameter determination, seepage-proofing scheme determination, construction scheme selection and the like, and therefore, the seepage-proofing method is obvious in seepage-proofing effect, and is especially suitable for seepage-proofing of the deep cover layer.

Description

technical field [0001] The invention belongs to the field of gates and dams with deep covering layers, and in particular relates to an anti-seepage method for deep covering layers. Background technique [0002] The deep overburden of the river bed refers to the Quaternary loose deposits accumulated in the river valley with a thickness greater than 40 meters. The deep overburden of the river bed in Southwest China, especially in Tibet, is widely distributed, generally with a thickness of more than 100 meters. In some areas The thickness can range from 300 to 600 meters, and it has the characteristics of preservation integrity, diversity and typicality. In actual engineering practice, due to the limitation of topographical and geological conditions, it is often necessary to build gravity-type concrete with water-retaining function on deep covering layers gate dam. [0003] The complex and unfavorable foundation conditions of deep overburden have brought certain difficulties t...

Claims

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Application Information

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IPC IPC(8): E02D19/18E02B7/10E02B3/16
CPCE02D19/18E02B3/16E02B7/10E02D19/185
Inventor 任苇张建华焦健李昌兵周开平廖祖梁
Owner POWERCHINA XIBEI ENG
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