To study the safety
and stability of large slopes, taking the right side slope of the Yuxi’an
tunnel of the Yuchu Expressway Bridge in Yunnan Province as an example, limit
equilibrium and finite element analysis were applied to engineering examples to
calculate the stability coefficient of the slope before and after excavation in
the natural state. After comparative analysis, it was concluded that the former
had a clear mechanical model and concept, which could quickly provide stability
results; the latter could accurately determine the sliding surface of the slope
and simulate the stress state changes of the rock and soil mass. The stability
coefficients calculated by the two methods were within the stable range, but
their values were different. On this basis, combined with the calculation
principles, advantages and disadvantages of the two methods, a comprehensive
analysis method of slope stability based on the limit equilibrium and finite
element methods was proposed, and the rationality of the stability coefficient
calculated by this method was judged for a slope case.
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