Deformation Mechanism and Support Treatment of High Slope with Upper-hard and Lower-soft Weathered Rock
Taking the upper-hard and lower-soft slope project on the north side of a substation site in Changsha as an example,through geological analysis and finite element numerical simulation,nonlinear static analysis and strength reduction method are adopted to conduct the numerical simulation calculations on both unsurpported and supported slopes.The deformation characteristics of the slope and the distribu-tion and development process of the plastic zone are obtained.This paper reveals that the compression and extrusion deformation of the lower-soft stratum of the slope act as a precursor,inducing tensile frac-ture and shear deformation of the upper rock and soil.This eventually leads to a shallow,traction-type,arc-shaped shear failure mechanisim.Aiming at the failure mode of the slope,the limit equilibrium meth-od is adopted to calculate the safety factor of the slope under different anchor cable incident angles and lengths in the reinforcement area,and the support scheme is optimized.It is finally determined an opti-mal reinforcement scheme with an average anchor cable length of 21 m and an incident angle of 30° for the slope reinforcement area.
upper-hard and lower-softhigh slopenumerical simulationcable supportingdeformation mechanism
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