The stability of soft soil slope is an engineering problem.

However, the mechanism of soil nailing for soft soil slope wasn t understanded completely, it s design theory lagged behind the engineering practice.

As for rare macrocharacters of landslide of soft rock slope in a mine, the mechanism that the residual tectonic stress impacted the slope and the mechanics of waterfilm of intercalated clay layer were studied.

Based on the study on the deformation of largescale toppling rock mass in Fushun west open pit,this paper research the features of deformation and failure of the soft rock slope controlled by weak intercalated beds,and its influence on urban industry establishment.

Combined with scheme comparison of quay structure,good efforts of cement deep mixing pile to consolidation of weak soil slop is expounded in this paper by theory calculation and some problems on using this method is put forward.

Tests on anti-slide behavior of one soft soil bank improved by deep-mixing-cement pile(DMCP) is introduced.

From the practice of the "slope soft soil"problem encountered duringThe railway construction in southwest mountainous area,in this paper,the cause analysis and engineering featurehad been studied by the test and engineering practice,and,the treatment measures of the embankment engineeringin the area of "slope soft-soil" has also been introduced.