Abstract: Facing is significantly important for stability of soil-nailing walls and for transferring earth pressure to stabilized soils . It is absolutely sure that the facing bear against water and earth pressure. However present designers of soil-nailing walls consider the facing as accessory structure rather than the main one. Facing isolated and considered as finite beam on winkler foundation simply, solutions of displacement and inner force of soil-nailing walls are gained through analyzing soil-nailing interaction. The results show maximal value of displacement is on the lower side of slope instead of the top. The location moves down with the pit depth. The law is that displacement is larger in the middle than the two sides in agreement with the actual measurement data. Internal friction angle and cohesive strength have large effects on the displacement, so preventing water from flowing to the vacation is very important. The analytic solutions also disclosure characteristics of moment and lateral earth pressure. Facing moment is increased with depth, the gains are small at the top slope and large at bottom of pit, and reaches its maximal value at lower side of slope. The moment is developed into negative one because of passive earth pressure at the bottom of pit. Earth pressures have similar characteristics and behaviors with inner facing displacement. The paper puts forward a method of exploring soil-nailing walls based on precise Elasticity Theory , the results are also referenced by designer and give people throughout comprehension of soil-nailing walls.

Key words: soil-nailing wall, displacement, bending moment, Winkler foundation model, earth pressure