석탄회의 상대밀도에 따른 Lade 단일항복면 구성모델의 토질매개변수 특성
Characteristics of Soil Parameter for Lade’s Single Work-Hardening Constitutive Model with Relative Density of Bottom ash
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초록
본 연구는 석탄회의 상대밀도를 40%, 60%, 80%, 95%로 각각 변화시켜 등방압축팽창시험과 구속압력을 달리한 배수삼축시험을 하였다. 그리고 이 시험자료를 이용하여 Lade의 단일항복면 구성모델의 토질매개변수의 변화 특성을 알아보았다. 그 결과 탄성성분을 나타내는 토질매개변수 Kur과 n은 상대밀도의 변화에 따른 영향이 미소하고 파괴규준, 경화함수, 소성포텐셜에 관련된 토질매개변수는 상대밀도의 증가에 따라 선형적인 증·감현상을 보이고 있다. 그리고 항복함수에 관련된 토질매개변수 h와 는 상대밀도에 따른 변화가 미세하고 파괴규준에 관련한 토질매개변수와 관련성이 매우 높아 파괴규준, 에 관한 식으로 대체할 수 있으며, 이 식을 이용하여 수치해석한 결과 양호하게 예측하고 있다.
Abstract
This study was performed a series of the isotropic compression-expansion tests and the drained triaxial tests with various the relative densities 40%, 60%, 80% and 95% for bottom ash. Using the tests results the characteristic of the parameters of Lade's single hardening constitutive model were investigated. The soil parameters Kur and n representing elastic behavior are not much affected by the change of the relative density. The other parameters such as failure criterion(), hardening function() and plastic potential() are in a positive linear relationship with the relative density. Since the soil parameters h and representing yield function do not change much to the change of relative density and also closely related to failure criterion, they can be replaced by failure criterion . We also observed that predicted values from the Lade’s single hardening constitutive model were well consistent with the observed data.
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