Abstract：In order to further study the coordinative working mechanism of an active-passive composite supporting structure,the soil nailing wall reinforced by pre-stressed anchors( SNWRPA) is researched through theoretic analysis and numerical simulation. The distribution of soil pressure between soil nailing and anchor force is analyzed,and the various coordinative working mechanism of components is studied. An Improved Increment Method( IIM) is adopted to calculate the horizontal displacement of a composite soil nailing wall in construction,deformation theory is put forward,and several influential factors are considered. Such conclusions are reached. Firstly,pre-stressed anchors should be set for two layers to satisfy optimization design theory.Secondly,soil nailing forces nearby will be affected by pre-stressed anchors. Thirdly,IIM will be simple,convenient and reliable for the calculation of horizontal displacements of a composite soil nailing wall.

Keyword：active-passive composite supporting structure;coordinative working;increment method;prestressed anchor;