Stability analysis of broken argillaceous siltstone slope based on strength inversion
When highly weathered argillaceous siltstone is extremely fragmented and partially sandwiched with weathered fragments,the integrity of the rock mass sampled from the slope survey borehole is low,and the shear strength given by the test does not match the natural state of the soil.In order to obtain reasonable strength parameters,a finite element analysis model is constructed based on improved experimental data for excavation slopes in different periods.Theoretical analysis methods are used to calculate the strength param-eters of geotechnical materials inversely,in order to study and determine the strength characteristics of mud-dy siltstone and conduct reliable high slope protection design.The research result has shown that for stable slopes that have not experienced sliding after 4 years of excavation,the shear strength parameters of strongly weathered argillaceous siltstone obtained from the first survey and the calculated slope stability coefficient are relatively low.The use of"double tube double action+semi open tube"during supplementary exploration can maximize the collection of undisturbed rock samples,with an average core recovery rate of 91％,resul-ting in more realistic shear strength parameters.Based on indoor experiment,a model is established for in-version to obtain the shear strength parameter c=36 kPa of strongly weathered argillaceous siltstone ø=31° is more reasonable.The practice has shown that the design of slope support structures based on numerical calculation,site geological condition,etc.is economical,reliable,and effective.
slopeshear strengthfinite element analysisstability analysisinversion calculation
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