The design of the high slope k35 of expressway which links Guangdong and Jiangxi provinces selected the strength parameter of thoroughly met sandstone

and the values of safety coefficient F is worked out by Janbu and M-P methods were all more than 1.20

which indicated that the slope was in a stable condition. But the result of monitoring which didn’t confirm to the design indicated that this slope deformation increased sharply and the slope was in an unstable deformation condition after the strong rainfall. Therefore

on the basis of data of the monitoring

selected a new calculation parameter and made a checking calculation on the stability of slope. The result of the safety coefficient was Fs = 1.05

which showed the slope was in an unstable condition. According to the checking computations

the slope should be strengthened and consolidated; and the safety coefficient Fs should be checked after strengthening the slope. The result approved the effectiveness of the strengthening. After that

the deformation of the slope came down fast and it recovered a normal condition.