关键词: 高速铁路, 陡坡地基, 路肩桩板墙, 力学响应, 现场测试

Abstract: It is key to grasp mechanical response of shoulder sheet-pile wall in steep ground along a high-speed railway for control of lateral deformation of embankment. In this study, the sheet-pile walls in steep ground along Guiyang-Guangzhou high-speed railway were selected as monitored objects. Long-term observations for the earth pressure behind the wall, the internal force and deformation of the pile were made for more than 900 days. The layered filling-induced differential deformation between sheet pile walls was intensively discussed, and the effect of roller compaction-induced residual stress on distribution of earth pressure was discussed as well. The results indicate that the lateral deformation of embankment is effectively limited by sheet-pile walls. The lateral deformation of the pile top is about 0.94‰ height of the wall and tends to be stable in 1?1.5 years later, this is about 30% of the total displacement after embankment is filled. The roller-compacted coarse-granular filler behind the wall can still reach active earth pressure state even in small lateral deformation. The lateral deformation of fills caused by the layered filling presents a shape of small at top and large at bottom and is opposite with the displacement distribution of sheet-pile wall. The lateral deformation of fills is the main factor for parabolic distribution of earth pressure behind the wall. The recommended bending moment formula about pile according to concrete stress and steel bar strain in field test is consistent with theoretical calculation value.

Key words: high-speed railway, steep ground, shoulder sheet-pile wall, mechanical response, field test