Abstract: Based on the project in the tidal gate of Sanyang port in silt foundation, a field experimental study was conducted on lateral load capacity, in order to study the effect of filling pile enhanced by the soil-cement pile. For measuring the pile stress distribution of the body in the horizontal load and getting the distribution of bending moment, reinforcement meter were welded to the steel cage at different elevations when the filling piles were being driven; Soil pressure cells were buried on both sides of pile; in order to get the distribution of the soil pressure while the lateral load test was under way. The results show that, filling pile enhanced by soil-cement piles can control the development of horizontal displacement and increase the level of pile bearing capacity. Distribution of the bending moment value and the soil pressure of the soil around the pile are presented the developing trend of increasing initially and decreasing afterwards, and are mainly concentrated in the upper part of the pile and soil, and go to the maximum value of about 3m below the soil surface. Soil-cement pile can effectively reduce the value of bending moment of the pile, and can also weaken the emergence of anti-bottom. The soil around pile can provide greater soil pressure when the filling pile is surrounded by the soil-cement pile. The lateral load capacity of filling pile is impacted greatly by the upper level of soil, that is, raising the upper soil physico-mechanical properties can increase the level of lateral bearing capacity.

Key words: lateral load, filling piles, cement-soil pile, field test