Elastoplastic Solution of Cylindrical Hole Expansion in Unsaturated Soil Under Two-Dimensional Unequal Pressure Stress Field
In order to solve the elastoplastic solution of cylindrical hole expansion in unsaturated soil under two-dimensional unequal pressure stress field,based on the unified strength theory of unsaturated soil and the elastic-perfectly plastic model,the elastoplastic boundary line of unsaturated soil under two-dimensional unequal pressure stress field is derived,which is compared with the existing literature solutions to ensure the calculation accuracy.Finally,the influence of horizontal and vertical in-situ stress ratio,reaming pressure,matrix suction and intermediate principal stress on the radius of plastic zone is analyzed.The results show that at that time λ≤1(λ＞1),the elastic-plastic interface intersects at θ=30°(θ=60°);The elastic-plastic interface intersects at.In the range 0°≤θ≤ 30°(λ ≤ 1)and 0°≤θ≤ 60°(λ＞1),the elastic-plastic boundary line increases with the increase of horizontal and vertical in-situ stress ratio;In the range 30°≤θ≤90°(λ≤1)和 60°≤θ≤90°(λ＞1)is the opposite.
two-dimensional unequal pressure stress fieldunified strength theory of unsaturated soilelastic-perfectly plastic modelmatrix suctionintermediate principal stress
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