Abstract:The underground cable grooves in the substation are crisscrossed, and the space of the cable trench itself is narrow, which leads to the traditional backfill method can not be rammed, and the traditional backfill has poor scour resistance, resulting in uneven settlement and erosion induced collapse in the later stage. Based on the settlement and collapse of 330 kv substation in Yueya Lake, a targeted construction method is put forward, that is, by preparing self-compacting desert sand poor concrete slurry, these narrow tunnels are poured. It solves the problem that the desert sand poor concrete slurry has strong scour resistance to avoid scour collapse and reduces maintenance frequency.