[Objective]In order to explore the stability law of single geotechnical bag at the bottom of river bank revetment under the action of water erosion,[Methods]Based on the actual project of Tarim River geotechnical bag revetment,the flume model test platform was built,and the geobag models of different specifications were made.The deficiency of Robin volume formula in practical engineering application is discussed.Based on the test result of geobag,the response rules of key factors and stability in practical engineering,such as filling rate,ratio of length to width,roughness of underlying cushion surface,placement form and so on,are analyzed.[Results]The test result show that the thrust(FD)of the geotextile bag increases gradually with the in-crease of the filling rate,and the lift(FL)increases first and then decreases with the increase of the filling rate.When the aspect ratio is greater than 2.33,the stability of the geotextile bag decreases gradually when it is placed along the water flow,while the stability of the geotextile bag decreases with the increase of the aspect ratio when it is placed perpendicular to the water flow.The stability of the geobag is effectively improved by changing the roughness of the geotechnical bag and the underlying surface.[Conclusion]The result show that the filling rate directly affects the effective stress area of the geobag after filling,and then affects the size of FD and FL that make the geobag unstable.The stability of the geobag is not only related to the filling rate,but also affected by the design of the length-width ratio of the geobag.The larger length-width ratio is not conducive to the stability of the geotechnical bag,and the stability ability is very different when the downstream flow and the vertical flow are placed.In prac-tical engineering,geotextiles can be laid under the geobags at the bottom of the protective bottom.On the one hand,it can improve the friction stability of the geobags,and on the other hand,it can also play a certain role in anti-filtration.
关键词
水利工程/河岸护坡/土工袋稳定性/模型试验/充填率/长宽比/下垫面糙率
Key words
water conservancy engineering/river bank slope protection/stability of geobag/model test/filling rate/length-width ratio/underlying surface roughness
维普
万方数据