Reinforced-clay seepage prevention structure and construction method thereof
A technology of clay and reinforcement, applied in water conservancy projects, sea area projects, buildings, etc., to achieve the effect of making up for easy cracking, small engineering costs, and simple structure
Active Publication Date: 2013-03-20
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to provide a reinforced clay anti-seepage structure and its construction method which is convenient for construction, reasonable in cost and meets the anti-seepage requirements of reservoir basins, aiming at solving the problems caused by large differences in foundation conditions. The anti-cracking problem of the clay bedding at the site, to achieve the purpose of improving the operational reliability and anti-seepage effect of the clay bedding
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[0019] Such as Figure 1-Figure 3 As shown, the reinforced clay anti-seepage structure of this embodiment includes a transition material layer 6, an anti-filter material layer 5, a clay bedding layer 4 and a gravel protection layer 3 laid sequentially from bottom to top above the flat reservoir bottom. Between the anti-filter material layer 5 and the gravel protection layer 3, the area prone to uneven settlement and its affected area (that is, the part with a large difference in basic conditions and a certain range around it, for figure 2 For the bottom of the reservoir combined with excavation and filling shown, the area prone to uneven settlement and its affected area are the combination of excavation and filling of the reservoir bottom and a certain area around it, that is, within a certain range on both sides of the boundary line 1 between excavation and backfill; for image 3 The bottom of the reservoir with rigid buildings is shown, the area prone to uneven settlement a...
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The invention relates to a reinforced-clay seepage prevention structure and a construction method thereof. The invention aims to solve the technical problems on clay blanket crack resistance on the parts with bigger basic condition difference and improvement of the operation reliability and seepage prevention effect of clay blankets. In a technical scheme for solving the problems, the structure comprises a transition material layer, an inverted filter material layer, a clay blanket layer and a rock ballast protection layer, wherein the four layers are arranged above a flat reservoir bottom and are laid from bottom to top in sequence; and a plurality of geogrid layers are laid in the area in which uneven settlement is easy to occur and influenced areas of the area between the filter material layer and the rock ballast protection layer. The construction method comprises the following steps: a. excavating, backfilling and flattening the reservoir bottom; b. laminating and backfilling transition materials and filter materials layer by layer in sequence; c. laying a geogrid layer; d. laminating and filling clay layer by layer and laying a geogrid layer every 1-2 clay layers until the thickness reaches the designed layer thickness; and e. backfilling the rock ballast protection layer. The structure and the construction method are mainly used for reservoir bottom seepage prevention in the hydraulic and hydroelectric engineering.
Description
technical field [0001] The invention relates to a reinforced clay anti-seepage structure and a construction method thereof, which are mainly suitable for anti-seepage at the bottom of reservoirs in water conservancy and hydropower projects. Background technique [0002] The reservoir of the pumped-storage power station project has high requirements for anti-seepage of the reservoir basin. Generally, the daily infiltration is required not to exceed 2 / 10,000 to 5 / 10,000 of the total storage capacity. When the natural reservoir basin cannot meet the leakage control standards, anti-seepage measures must be taken seepage measures. As a common natural anti-seepage material, clay is often used for anti-seepage of reservoir basins, but the tensile strength of clay is very low, and tensile cracks are easy to appear in parts with uneven settlement, which leads to the failure of anti-seepage structures. The problem of clay bedding installed in places with large differences in foundati...
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IPC IPC(8): E02B3/16
Inventor 朱安龙汤旸
Owner POWERCHINA HUADONG ENG COPORATION LTD