The underground Rapid Transit System (RTS) stations and cut-and-cover tunnels are typically constructed by the “open-cut and bottom-up” method. In this method, the earth is excavated to the required depth with retaining walls and struts supporting the soil at the sides. Upon the completion of excavation to the required depth, the base slab of the underground structure is cast at the bottom-most level, followed by the side walls. Casting of concrete progresses upwards, level by level till the roof of the structure is completed. Ground is then backfilled and reinstated.
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