土工管袋充填特性模型试验研究

MODEL EXPERIMENTAL STUDY OF FILLING PROPERTY OF GEOTEXTILE TUBE

为了更为深入的研究土工织物管袋的充填特性,通过开展室内土工管袋模型充填试验,对其形状、高度、所受张力、底部压力和排水速度进行研究,试验数据可为理论研究提供验证基础。由试验结果可知:土工袋高度随着充填的进行迅速增加,其它参数如土工织物所受张力、袋体底部压力和排水速度随之增加,到一定程度后袋体排水速度接近充填速度,袋体高度增加的速度明显减小,充填袋所能达到的高度由充填压力和土工织物的渗透性决定,在选定合适的土工织物后,可用充填速度来控制袋体高度;充填管袋排水主要发生在充填过程中和充填完成后的几分钟内;土工管袋横断面呈椭圆弧状,可按平面应变问题处理。

In order to have an in-depth study of the filling property ofgeotextile tube, based on the indoor model filling experiment, the shape, height, tension, the bottom pressure acting on the bag and the drainage rate of the tube are tested. The test data could provide verification for theoretical study. The results show that： as the filling proceeds, the height of the tube is increasing rapidly; and the other characters such as the tension, the bottom pressure, the drainage rate grow with it quickly： when the drainage rate grows close to the filling speed, the speed of increase in the height of tube is reduced significantly. The height of the tube, which is determined by the filling pressure and the permeability of the geotextile, could be controlled by the filling speed after the suitable geotextile is chose. The drainage mainly occurs in the filling process and within a few minutes after the completion of the filling. The cross-section of the tube is oval arc shaped, which could be dealt with as the plane strain problem.