IMPACT ANALYSIS OF CREEP MOVEMENT OF ZHENGJIAWAN LANDSLIDE TO BRIDGE ACROSS

Current research of the impact of landslide creep on bridge across the landslide is far from consummate. Measured data is deficient as well. On the basis of long-term monitoring of Zhengjiawan landslide and the bridge across it, the potential sliding surfaces of landslide are inferred according to monitoring data of deep displacement. The influence of meteorological factors on the monitoring data is analyzed. Moreover, the correlation between the creep of landslide and bridge deformation is studied. Study results show as follows. (1) Depth of Zhenjiawan landslide is 3~19m, and monthly displacement is 0.64~5.16mm, and the cumulative displacement is 20~62mm, which proves that the landslide is creeping intermittently.(2) The deformation of Zhengjiawan landslide and bridge is dominated by rainfall. During the monitoring period the maximum monthly rainfall is 390.2mm. At the same moment the largest deformation of landslide and bridge is 2mm·month^-1 and 7mm·month^-1.(3) The deformation of bridge and landslide is synchronous. The monthly displacement difference is 0.24~2.13mm. The cumulative displacement difference is 6.3mm. Data and results of this paper has important significance to the management of Zhengjiawan landslide and the analysis of similar bridges across landslide.