The rubber dam has superior water retaining ability,practicability,and a good landscape,which is widely used as urban river water retaining dam and weir.The air-inflated rubber dam is more convenient to install and dismantle than the water-inflated rubber dam.However,at present,the air-inflated rubber dam is roughly designed by the look-up table method,which is complicated and has errors.In view of this,a large scale model test was conducted to test the sectional shape and the tension of the air-inflated rub-ber dam under the conditions of inflation and water retaining.And a finite-difference model for the water-retaining ability of an air-in-flated rubber dam was established,which was confirmed by large-scale model tests and existing design specifications.The relationship between the cross-section shapes and sizes,the tensions and the upstream water levels,and the internal air pressure of the rubber dam during the water retaining process was analyzed.The results show that the width B and contact width b nonlinearly increase with the in-crease of the upstream water levels,whereas the height H and cross-sectional area A decrease nonlinearly.Under the design conditions,the height H and cross-sectional area A nonlinearly increase with the increase of internal air pressure,whereas the width B and contact width b decrease nonlinearly.The tension T is proportional to the internal air pressure.Based on the Chapman-Richard model,the geo-metric dimensions,tensions and internal air pressure are fitted under the design conditions,and the simplified design calculation for-mulas are obtained,which can be used for the design of the air-inflated rubber dam project.
关键词
橡胶坝/充气式橡胶坝/挡水性能/模型试验/有限差分法/简易设计公式
Key words
rubber dam/air-inflated rubber dam/water-retaining/model test/finite difference method/simplified design formula
维普
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