弯曲河道洪水冲刷重力式护管挡墙稳定性分析

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Abstract Gravity pipeline protection wall，as a main type of hydraulic protection projects，is likely to be destroyed by the rushing flood. In view of the present instability problems of gravity retaining wall subjected to loads of flood in river bend and according to the structure characteristics and the actual stress state of the pipeline protection retaining wall，the paper puts forward new formulas about safety factor of wall?s stability and the lateral scour limit depth under wall，in which the factors，such as the rush of flood，the buoyancy force，the seepage water pressure，the lateral widening depth under wall and the descent velocity of flood level，are considered. Based on the formulas，the effect of each factor on the stability of the retaining wall is analyzed. The results indicate that in the period of flood level rising，owing to the loads of flood in river bend，the wall shows a decreasing horizontal slide failure trend to the river. On the contrary，the buoyancy force，the seepage water pressure，lateral widening depth and the descent velocity of flood level make the retaining wall easy to overturn and there is a non-proportional relationship between the ability to resist overturning and the water level difference before and after the retaining wall. The formulas and analytical ideas and methods cannot only be adopted to the stability analysis of gravity retaining wall along the river，but also provide a theoretical reference for the similar engineering design and research.

Key words： hydraulic engineering gravity pipeline protection retaining wall flood scour stability analysis the scour limit depth

Received: 26 May 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/IS1/2670

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