充泥过程中土工织物管袋的受力和变形分析

Analysis of force and deformation of geosynthetic tube filling with slurry

为充分认识大型土工织物充泥管袋受力和变形的时变特性,并为管袋设计提供计算依据,采用无量纲化的方法,推求土工织物管袋在充泥过程中,从管袋顶部压力为零(即自由充填)到大于零(即通过泵压充填阶段)的拉力、变形形状以及充填高度随时间变化过程的解答。结果表明:当采用密度为ρ的泥浆充填横截面周长为L的管袋时,从自由充填到泵压充填的临界充填高度为0.1L,单位长度充填体积为0.04L2,对应的管袋拉力为0.002 5ρg L2;管袋在达到临界充填高度后,需要持续增加泵压才能使其继续充填,所需泵压与管袋拉力均随充填高度呈非线性快速增长。

To understand the time-variant characteristics of force and deformation of large-size geosynthetic tubes filled with slurry and to provide a calculation basis for tube design,the tension,shape,and height of a geosynthetic tube during the filling process were calculated using the dimensionless method. Two working conditions during the filling process were considered： one was the free filling condition,under which the pressure at the top of the geosynthetic tube was zero,and the other was the pump filling condition,under which the pressure at the top of the geosynthetic tube was greater than zero. It was found that,when a geosynthetic tube with a perimeter of L was filled with slurry with a density of ρ,the critical filling height from the free filling condition to the pump filling condition is 0. 1L,the filling volume per unit length of the geosynthetic tube is 0. 04L2,and the corresponding tension of the geosynthetic tube is 0. 002 5ρg L2. After the critical filling height was reached,a continuous increase in the pump pressure was needed to maintain the filling process. Both the required pump pressure and the tension of the geosynthetic tube increase nonlinearly and rapidly with the filling height.