The Necessity of Shield Tunneling Slurry Treatment
Pub Date:Jul 26, 2023 | Views:77 |
Currently, the majority of excavated soil during shield tunneling is in the form of slurry produced by the operation of the slurry balance shield machine. This process generates a large amount of mud cakes and slurry, which can cause pollution to the surrounding environment and have an impact on the ecological surroundings. To reduce the impact of this excavated soil on the environment, the following points should be considered during the treatment of the tunneling slurry:
1, Proper selection of slurry treatment methods.
Improper selection of slurry treatment methods can not only affect construction efficiency but also impact the overall project quality. Therefore, before construction begins, the appropriate slurry treatment method should be chosen based on the specific circumstances and geological conditions to achieve economic and environmentally friendly objectives.
2, Proper handling of the excavated soil.
The excavated soil from shield tunneling should be promptly processed and not allowed to accumulate on the ground or be directly piled up on the surface. Due to the flowability, high water content, high viscosity, and high corrosiveness of the soil generated during shield tunneling, it is crucial to handle this soil properly, taking into account its unique characteristics.
3, Strengthening monitoring and supervision.
Given the flowability, high water content, and corrosiveness of the excavated soil from shield tunneling, enhanced monitoring and supervision are particularly important.
KOSUN slurry treatment system has recently been successfully implemented in a domestic subway project and has shown positive results. The system uses a conveyor belt to transport freshly excavated soil from the depths of the tunnel to the feeding hopper of the surface soil separation system. The coarse and fine sand separated from the soil are then transported by an elevating conveyor belt to trucks for transportation. This method allows for the classification, dewatering, and drying of the excavated soil, enabling the recycling and reuse of inorganic materials and water resources. It has not only achieved the reuse of excavated soil but also generated significant economic benefits, adding a new "magic tool" for green construction and urban infrastructure development.