Different from general raft foundation, the inner force of ribbed beam is calculated as variable section because of the stump.
与一般的筏板基础有所不同，由于有柱墩，有肋梁墩式筏板基础梁的内力需按变截面梁计算。
2
Considering the thick backfill and soft foundation soil in the cut-and-cover section of Jiadi tunnel, a pile-raft foundation is accepted in order to avoid negative effect due to excessive settlement.