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Method for determining runway lawn slope impact-resistance

A technology of anti-scour performance and turf, which is applied in the field of measuring the anti-scour performance of river turf slope protection, which can solve the problems of complex similarity law and other problems.

Inactive Publication Date: 2010-05-12
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the hydraulic model test about vegetation and fluid movement, the original body water flow is usually scaled to the model water flow according to a certain similarity criterion, and the vegetation original body is also replaced by artificial material vegetation models such as polyethylene and polypropylene silk, then the vegetation and water flow The similarity law issues involved in the model test under the interaction are extremely complex, and the obtained model test results often have relatively large limitations in engineering and academic value when they are extended to the original water flow

Method used

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  • Method for determining runway lawn slope impact-resistance
  • Method for determining runway lawn slope impact-resistance
  • Method for determining runway lawn slope impact-resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] For the determination of the anti-scour performance of turf slope protection, 16 groups of turf planted in paddy soil with a growth period of 1.5 months, 2.5 months, and 4.0 months were selected, including 8 groups of natural turf and 8 groups of three-dimensional vegetation net reinforced turf. The measured design pressurized maximum velocity water flow is 4.0m / s, 4.5m / s, 5.0m / s, and the submersion duration is 6h, 12h, 24h, 48h respectively.

[0085] When scouring, the flow velocity of the pressurized high-velocity flow is quickly loaded step by step from 1.0m / s to 5.0m / s with an increase of 0.5m / s, and the head loss in the vegetation area at each level of flow velocity is measured to calculate Bed shear stress values ​​at various flow velocities, and the test results are plotted on image 3 , to obtain the relationship curve between bed shear stress and flow velocity in the vegetation area.

[0086] After the design flow rate is reached, the flushing duration timer i...

Embodiment 2

[0094] For the determination of the anti-scour performance of turf slope protection, 12 groups of turf planted in red soil with a growth period of 1.5 months, 2.5 months, and 4.0 months were selected, and the submersion duration was 6h, 12h, 24h, and 48h. 6 groups of reinforced turf. The flow velocity of the designed pressurized high flow velocity is 2.0m / s, 2.5m / s, 3.0m / s respectively.

[0095] When measuring, the flow rate is quickly loaded step by step from 1.0m / s to 3.0m / s with an increase of 0.5m / s, and the head loss in the vegetation area at each level of flow rate is recorded, so as to calculate the bed at each level of flow rate. surface shear stress value, and plot the result on Figure 5 , to obtain the relationship curve between bed shear stress and flow velocity in the vegetation area.

[0096] After the design flow rate is reached, the flushing duration timer is started, and the head loss is measured at intervals of 0.5 h, and the shear stress value of the bed s...

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Abstract

A method for determining washout-resisting ability of turf slope protection on river channel includes preparing vegetative cover model, erecting and debugging determination device, washing out vegetative cover model, applying washout water stream in simulating to actual water flow-speed in river channel to wash out vegetative cover mode to obtain shearing stress valve when turf slope protection isdamaged.

Description

technical field [0001] The invention belongs to the field of ecological bank protection, in particular to a method for measuring the anti-scour performance of river turf slope protection. Background technique [0002] In bank slope protection engineering, turf is widely used for bank slope protection in areas above the normal water level. The main function of grass planting is to block the water flow and protect the bank slope, and to reinforce and restrain the soil with grass roots. Reinforced with geotextiles or concrete blocks, the impact resistance of natural turf can be improved, which is called reinforced turf. The use of three-dimensional vegetation mats in geosynthetics to reinforce slopes and dams is a new technology for bank slope protection that has emerged in recent years. It has the characteristics of excellent soil-fixing performance, outstanding network reinforcement, obvious energy dissipation and good thermal insulation. , can be applied to embankment slop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M10/00E02B1/02E02B3/12
Inventor 张玮钟春欣应翰海龚静怡
Owner HOHAI UNIV