무동력 토사제거시스템의 현장모형실험

Field Model Test of the Non-power Soil Cleaning System

Abstract

Coastal and fishing facilities are gradually deteriorating in function due to the continual accumulation of soil sediments, which has affected local economic activities. Currently, there are many methods to remove soil sediments, but these methods are either a temporary solution or require a repetitive removal of the soil sediments, which is a huge financial burden for the maintenance of the facilities. To solve these problems, this study proposed a non-power soil cleaning system and evaluated field applicability by carrying out field model tests. The conditions for the evaluation focused on the drainage-elapsed time and drainage-outflow velocity according to the water level change in the water tank. In the field test, silty clay and sand were separately installed, and sedimentation soil removal test was practiced. As a result, the system was verified to have a sufficient outflow velocity for the removal of soil sediments. In addition, a generalization equation that can be used in different regions of the tide was suggested in this study. These results will greatly contribute to removing soil sediments in ports and dike gate facilities on the southwest coast. Since the system is an eco-friendly technology that does not require additional energy, thus it is expected to contribute to maintenance of sustainable facility performance as well as economic effect in the future.

Fig. 1 The mechanism of non-power cleaning system

Fig. 3 The producing process of non-power cleaning system

Fig. 2 Tidal curve in Janghang port

Fig. 4 The dimension of non-power cleaning system

Fig. 5 The location of experiment site (Songrim port)

Fig. 6 Grain size distribution

Fig. 7 Variations of generalized time-water level in tank

Fig. 8 Variations of generalized water level-time

Fig. 9 Variations of time - flow velocity with water level

Fig. 10 Variations of generalized water level-flow velocity

Fig. 11 Removal phenomenon of the deposited sand

Fig. 12 Variation of the critical erosion velocity curve(Hjulström's diagram)

Fig. 13 Removal phenomenon of naturally deposited silty clay

Fig. 14 Removal phenomenon of artificially deposited silty clay

Fig. 15 Occurrence oder of low level

Fig. 16 The system operation ratio with sill elevation

Table 1 The dimension of system (Unit: mm)

Table 2 Geotechnical properties of materials used