CAJ | 학술논문

通过对三门峡铝土矿砂岩进行单轴压缩蠕变实验，获取该类岩石的蠕变实验曲线。通过分析蠕变曲线各应变分量特征，将蠕变总应变细分为瞬时弹性应变εme、瞬时塑性应变εmp、黏弹性应变εce、黏塑性应变εcp。根据瞬时塑性应变数据特征，引入新的瞬时塑性原件，定义瞬时塑性模量，建立改进的伯格斯(Burgers)流变模型，完成模型的直接筛选法辨识。根据模型元件力学性质，推导模型在不同应力等级下的一维和三维蠕变方程。采用最小二乘法辨识一维模型各参数，迭代时采用高斯-牛顿法计算，最后拟合实验曲线，验证直接法模型建立的正确性，完成模型后验排除法检验。研究表明，改进的伯格斯模型较好地描述了砂岩流变特征，实现砂岩流变曲线的微观分析，此外，也验证了流变模型综合辨识方法的正确性。
통과대삼문협려토광사암진행단축압축연변실험，획취해류암석적연변실험곡선。통과분석연변곡선각응변분량특정，장연변총응변세분위순시탄성응변εme、순시소성응변εmp、점탄성응변εce、점소성응변εcp。근거순시소성응변수거특정，인입신적순시소성원건，정의순시소성모량，건립개진적백격사(Burgers)류변모형，완성모형적직접사선법변식。근거모형원건역학성질，추도모형재불동응력등급하적일유화삼유연변방정。채용최소이승법변식일유모형각삼수，질대시채용고사-우돈법계산，최후의합실험곡선，험증직접법모형건립적정학성，완성모형후험배제법검험。연구표명，개진적백격사모형교호지묘술료사암류변특정，실현사암류변곡선적미관분석，차외，야험증료류변모형종합변식방법적정학성。
Based on the uniaxial compression creep experiments conducted on bauxite sandstone obtained from Sanmenxia, typical creep experiment curves were obtained. From the characteristics of strain component of creep curves, the creep strain is composed of instantaneous elastic strain, εme, instantaneous plastic strain, εmp, viscoelastic strain, εce, and viscoplastic strain, εcp. Based on the characteristics of instantaneous plastic strain, a new element of instantaneous plastic rheology was introduced, instantaneous plastic modulus was defined, and the modified Burgers model was established. Then identification of direct screening method in this model was completed. According to the mechanical properties of rheological elements, one- and three-dimensional creep equations in different stress levels were obtained. One-dimensional model parameters were identified by the method of least squares, and in the process of computation, Gauss-Newton iteration method was applied. Finally, by fitting the experimental curves, the correctness of direct method model was verified, then the examination of posterior exclusive method of the model was accomplished. The results showed that in the improved Burgers models, the rheological characteristics of sandstone are embodied properly, microscopic analysis of creep curves is also achieved, and the correctness of comprehensive identification method of rheological model is verified.