According to the stability of red sandstone bedding rock slope

a mechanical model is established; the hydraulic effect on slope under rainfall infiltration is calculated. Selecting a typical structural plane

through dry-wet cycling test

strength attenuation law of structural plane is analyzed. Comprehensive considering the rainfall infiltration and dry-wet cycling

the stability analysis of red sandstone bedding slope is analyzed; and the stability attenuation law is achieved. At last

by slope stability monitoring of Yan-Ru expressway

theoretical calculation results are verified. The results show that the hydraulic action is proportional to the water height in rock crack. Under dry-wet cycling

the cohesion of structural surface decays in the form of power function; and the internal frictional angle decays in the form of quadratic function. The slope stability has linear relationship with water height in rock crack and exponential relationship with dry-wet cycling. The dry-wet cycling has a greater influence on slope stability than that on water height in rock crack. Under the combined action of rainfall infiltration and dry-wet cycling

slope stability coefficient reduces by about 66%. Compared with considering single influence factor

the stability coefficient attenuation range has a great increase. The slope stability monitoring results agree well with theoretical results

the validity of theoretical results is further proved.