Stability analysis of slope with tensile crack under condition of seepage
Liang Li · Journal of Central South University(Science and Technology) · 2013
To study stability of slope with tensile crack during seepage,flow nets were simplified reasonably,and two methods,i.e taking soil body(total stress method) and soil skeleton(effective stress method) as research object,were used.Based on three kinds of sliding surface,including linear,circular and arbitrary curve,formulas for calculating factor of safety(FOS) were derived into slopes with shape of broken lines and steps.Through analyzing some examples,the similarities and differences of these methods were compared,and the effects of crack location and water level of crack on slope's stability were studied.The results show that the FOS calculated by using linear sliding surface is the biggest,and that calculated by using arbitrary curve sliding is close,but smaller than that calculated by using circular sliding surface, which shows that calculated results of arbitrary curve sliding surface is safer.When adopting the same type of sliding surface,the calculated FOS is quite close,and the critical sliding surfaces are almost the same through using two methods of taking soil body and soil skeleton as research object.The results calculated by method of taking soil skeleton as research object are small.Therefore using method of taking soil skeleton to analyze slope's state could make the results tend to be safer.The results calculated by curve sliding surface show that the closer to the top of slope the location of tension crack is,the more dangerous the slope is.The results calculated by linear sliding surface show that there is a specific crack's location that has greatest impact on stability of slope.When water table of tensile crack increases,the FOS calculated by each method all decreases,which indicates that the higher the water table of tensile crack is,the unsafer the state of slope is.