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Title |
Evaluation of Hydraulic Stability Using Real Scale Experimental on Porous Concrete Revetment Block
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DOI |
http://dx.doi.org/10.11112/jksmi.2016.20.2.122 |
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Keywords |
호안블럭 ; 다공성콘크리트 ; 실규모 ; 소류력 ; 수리안정성 Revetment block ; Porous concrete ; Real scale test ; Bed shear stress ; Hydraulic stability |
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Abstract |
The past few decades of industrialization enabled human-centered stream developments, which in turn resulted in constructing straight or covered streams, which are used only for sewage disposal purpose. However, these types of streams have become the cause of flood damages such as localized heavy rain. In response, various construction methods have been implemented to prevent stream and embankment damages. However, regulations regarding these measures only lay out minimum standards such as the height of slopes and the minimum angle of inclination. Moreover, examination of tractive force, the most crucial factor in preventing flood damage, is nonexistent. Therefore, this study evaluates various tractive forces by implementing a porous concrete tetrapod at a full scale artificial stream for experiment, controlling the rate of inflow, and measuring the velocity and depth of the stream under different experiment conditions. The test results of the compressive strength, and porosity and density of rock of the porous concrete tetrapod was between 16.6 and 23.2 MPa, and the actual measurement of air void was 10.1%, thus satisfying domestic standard. The result of tractive force experiment showed a limiting tractive force of 47.202N/㎡, not satisfying the tractive force scope of 67N/㎡ the stream design working expertise proposes. However, there was neither damage nor loss of blocks and hardpan. Based on previous researches, it can be expected that there will be resistance against a stronger tractive force. Therefore, it is necessary to conduct another experiment on practical limiting tractive force by adjusting some experimental conditions.
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