Abstract:The composite facing,composed of concrete and waterproof wall,is an important component of the composite soil nailing system and plays a great role in determination of bearing loads and tensile forces of the soil nails. It’s necessary to design the composite facing before construction. For facing design, a model for a combination of soil nails with waterproof cement-soil mixing pile wall,were developed by using the theory of elastic foundation beam. The infinite-length elastic foundation beam models of the composite facing were established. In order to simplify calculations,a kinematics displacement method was proposed to calculate the internal forces in vertical cross sections of the composite facing and the calculation formulas were derived from different situations. The technique was applied to determine the strength of some cross sections from engineering practice. The calculation results indicate:(1) the internal forces of facing in vertical cross-sections will be a control factor of design,and (2) the tensile strength of cement-soil wall will govern strength of the facing. The proposed kinematical limit analysis methods are proved to be a useful technique for design and analysis of internal forces of the composite facing.