Hybrid wall design of soil nail and ground anchor

The existence of basements is known to be gradually increasing, based on their use in multi-storey buildings. In project sites, they are underground constructions which are closely related to excavation works. This structure is important due to the recurrence of limited space and increasing number of private vehicles. Due to this condition, the design of efficient and effective basement reinforcement is needed. Hybrid soil nail and ground anchor are among the methods of reinforcement, which are to be used on a retaining wall. Both reinforcements aims to reduce the use of retaining wall, such as contiguous bored pile, which is relatively expensive. In the hybrid design process, the SNI and FHWA approaches were used, with the SnailPlus, BMCOLPY/G, and SLOPE/W softwares. The design and analytical processes were also carried out sequentially, starting with the design of soil nails and ground anchor (via the SnailPlus & BMCOLPY/G softwares), as well as checking the total final stability of the basement, by using the SLOPE/W. According to SNI 8460: 2017, the hybrid design was used, due to the exceeding value of safety factor.