Failure surface and bearing capacity character of combined reinforced gabion retaining wall

In order to put forward the failure surface and bearing capacity formula of combined reinforced gabion retaining wall composed of the reinforced gabion retaining wall and green reinforced gabion retaining wall, the field test monitoring on a new type of reinforced support structure in the actual slope protection engineering of the 12 th contract section of Xiangtan-Hengyang West Line Expressway in Hunan Province was carried out. The strain distribution laws of the tied-reinforcement in different layers were obtained. Based on the new broken line potential failure surface whose kickpoint of the simplified failure surface is H/3 (H is the height of the retaining wall), the calculated formula of bearing capacity of the top surface of retaining wall under two failure modes of the broken line failure surface was deduced. Using the limit equilibrium method, the formula of ultimate bearing capacity under the condition of tensile failure was thoroughly discussed and this formula unifies the bearing capacity formula of the 0.3H simplified failure surface and that of the Rankine failure surface. The new broken line failure surface was compared with four typical failure surfaces. Results show that it is safer to calculate the failure mode by the broken line simplified failure surface than by the highway specification and BS8006, and it is more economic than the railway specifications. The failure mode of the reinforced earth retaining wall with double-twisted hexagonal steel wire mesh is the tensile failure mode. Test results agree well with calculated results.