Multilayer composite material for ecological slope protection of water level fluctuating section of navigable river and machining method

Abstract

The invention discloses a multilayer composite material for ecological slope protection of a water level fluctuating section of a navigable river. The multilayer composite material comprises a uniform and compact reverse osmosis bottom layer, a middle strong layer with high deformability and a sludge storage surface layer which is provided with an upper surface of a wave scouring resistant meldable fiber network structure, wherein the reverse osmosis bottom layer, the middle strong layer and the sludge storage surface layer are compounded in sequence. The multilayer composite material comprises composite layers with different properties; and by mutual cooperation of the uniform and compact reverse osmosis bottom layer, the middle strong layer with high deformability, the sludge storage layer and the upper surface of the wave scouring resistant meldable fiber network structure, the compact structure of the reverse osmosis bottom layer has a good reverse osmosis effect, the upper surface of the scouring resistant network structure can enable the overall structure to bear long-time surge scouring, pores and channels in the sludge storage structure provide a good attachment condition for sediment in water, and the middle strong layer can provide overall strength and ensure that plants can pass through the material without being blocked.

Description

technical field [0001] The invention relates to the field of geosynthetic materials, in particular to a multi-layer composite material and a processing method for ecological slope protection of a navigable river channel's fading section. Background technique [0002] For a long time, most of the domestic river regulation has used masonry, concrete and other materials to build hard slope protection. Hard slope protection emphasizes the flood control function of the river channel and the safety of engineering structures, but it brings many fatal flaws. First of all, the hard slope protection isolates the water and soil exchange, causing the unbalance of the water flow velocity pressure on one side of the river bank and the pressure on the soil on the other side, which aggravates the instability of the bank slope, forming cracks and subsidence of the slope body, and shortening the service life of the bank slope; secondly, the hard slope protection is due to the It destroys the...

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Problems solved by technology

The slope protection form using earth gabion and placing non-woven fabric inside row piles has obvious defects in the implementation process besides high engineering cost. Earth gabion slope protection is actually a hard slope protection, which ensures the water exchange between the river bank and the river water body , but the growth of aquatic plants on the earth gabion is difficult, especially in the section where the water level of the bank slope drops, and the ecological restoration effect is not good; once the water level of the pile row slope protection exceeds the height of the pile, its slope protection function will be greatly reduced or even invalid; ecological bag stacking and use The ecological soft row slope protection ensures the water exchange between the river bank and the river water body, and also solves the problem of plants growing on the ecological cloth (soft row), but its defects are also obvious. The ecological cloth (soft row) is generally made of thin and Fabrics with sparse and large gaps (including non-woven fabrics and woven non-woven composite fabrics) are used to ensure the penetration and planting of plant roots. The slope protection effect is acceptable in still water lakes or rivers with relatively slow water flow. Once encountering rapid water flow, The river bank slope with serious wave erosion, such as the bank slope of the navigable river channel washed by the wave of the ship or the wave formed by the ebb and flow of the big river, the thin, sparse fabric with large gaps cannot withstand the erosion of the big wave, and the soil will be If it is taken away by the waves, the slope protection will fail

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