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Experimental apparatus for determining runway lawn protection-slope impact-proof performance

A technology of anti-shock performance and test equipment, which is applied in the direction of coastline protection and hydraulic models, can solve the problems of complex model similarity and difficulty in meeting the test requirements, and achieve the effect of overcoming high-velocity water flow

Inactive Publication Date: 2007-11-21
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to relevant data, the turf can withstand a short-term flow velocity of 6m / s when the water flow is relatively deep, while the flow velocity of a general indoor open channel with a uniform flow and gentle slope does not exceed 1.5-2m / s, which is difficult to meet the test requirements
Artificial vegetation models such as polyethylene and polypropylene silk are often used in the existing turf slope protection anti-shock tests, but the model similarity problem involved in using artificial vegetation models instead of natural vegetation is extremely complicated, and it is difficult to give a clear and reasonable answer

Method used

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  • Experimental apparatus for determining runway lawn protection-slope impact-proof performance
  • Experimental apparatus for determining runway lawn protection-slope impact-proof performance
  • Experimental apparatus for determining runway lawn protection-slope impact-proof performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The experiment selected six groups of turf planted in paddy soil with growth periods of 1.5 months, 2.5 months, and 4.0 months, including three groups of natural turf and three-dimensional vegetation net-reinforced turf. The maximum design velocity of the test is 4.0m / s. Considering that the change of water level in the actual river channel and the infiltration of rainfall may affect the strength of slope soil and the survival of vegetation, and then affect the anti-scour performance of vegetation and the effect of slope protection, the vegetation box and turf should be washed with still water before the scour test begins. Submerged and soaked for 24h.

[0056] During the test, the flow rate was quickly loaded step by step from 1.0m / s to 4.0m / s with an increase of 0.5m / s, and the head loss in the vegetation area was recorded at all levels of flow rate, so as to calculate the bed pressure at each level of flow rate. The surface shear stress value, and the test results a...

Embodiment 2

[0064] The test selected six groups of turf planted in red soil with growth periods of 1.5 months, 2.5 months, and 4.0 months, including three groups of natural turf and three-dimensional vegetation net-reinforced turf. The maximum design velocity of the test is 2.0m / s. Considering that the change of water level in the actual river channel and the infiltration of rainfall may affect the strength of slope soil and the survival of vegetation, and then affect the anti-scour performance of vegetation and the effect of slope protection, the vegetation box and turf should be washed with still water before the scour test begins. Submerge and soak for 12h.

[0065] During the test, the flow rate was quickly loaded step by step from 1.0m / s to 2.0m / s with an increase of 0.5m / s, and the head loss in the vegetation area was recorded at each flow rate, so as to calculate the bed pressure at each level. The surface shear stress value, and the test results are plotted in Figure 9 to obtain ...

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Abstract

The invention relates to the test device to detect the riverway dirot protecting slope and anti rushing character. It includes the reservoir, the water pump, the test flume, the drainpipe and the flow pipe. The valve and the flowmeter are set on the flowpipe and the test flume is a close flume with the rectangular cross section. The vegetation module box installing hole is set at the bottom of the test flume which is connected with the vegetation module box or the movable soleplate. The water pressing flume can generate water flow with big flow speed; the module test result is the bed surface shear stress and the frictional flow speed, which can module the rushing process of the river to the vegetation. So it has the big engineer using value.

Description

technical field [0001] The invention belongs to the field of ecological bank protection, in particular to a test device for measuring the anti-scour performance of river turf slope protection. Background technique [0002] Turf slope protection is a kind of ecological revetment technology, which mainly adopts the method of planting artificial turf on the embankment surface to protect the bank slope soil. Under the scouring action of a certain intensity of river runoff, turf slope protection may be damaged, and it is necessary to conduct experimental research on the damage mode and limit water flow conditions of turf slope protection. The field test can be well integrated with the engineering practice, and the test results are relatively reliable, but the field test conditions are generally difficult to control, and the test cost is high, so the model test of the anti-scour performance of turf slope protection is chosen in the indoor water tank. [0003] It is a common metho...

Claims

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Application Information

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IPC IPC(8): E02B1/02E02B3/12
Inventor 张玮钟春欣应翰海龚静怡
Owner HOHAI UNIV
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