Where a shallowburied underground tunnel is mined in soft ground consisting of mud layers, plastic deformation, even loss of stability is prone to occur. The article presents a new kind of soil consolidation technology suitable for muddy ground, i.e. horizontal mixing consolidation technology. By means of the mentioned horizontal mixing consolidation technology, the difficult problem that there is no space available on theground surface for the ground consolidation construction is overcomed and the ground surface subsidence is effectively controlled by means of proper monitoring and control of the volume of thereturning mortars from the hole mouths.