基于DSCM增量分析的灰砂岩单轴压缩变形场演化特征研究  

Evolution Characteristics of Uniaxial Compressive Deformation Field of Limestone Based on DSCM Incremental Analysis

作　　者：王腾腾 张苑玉 范辉远 蒋孝东 赵亚周 WANG Tengteng;ZHANG Yuanyu;FAN Huiyuan;JIANG Xiaodong;ZHAO Yazhou(School of Civil Engineering,North China University of Technology,Beijing 100144,China)

机构地区：[1]北方工业大学土木工程学院,北京100144

出　　处：《矿业研究与开发》2024年第12期196-203,共8页Mining Research and Development

基　　金：国家自然科学基金资助项目(51774015)。

摘　　要：选用灰砂岩试件开展单轴压缩试验,在数字散斑相关方法(DSCM)观测变形场的基础上,采用增量分析方法计算得到不同应力增量条件下非均匀性指标、变形能密度和变形场等3个指标增量,对岩石峰前和峰后阶段的演化特征进行了研究。结果表明:峰前阶段变形局部化启动、空间非均匀性演化突增以及变形能密度突变时的应力基本一致;非均匀性指标增量非线性突变幅度与应力增量步距成正比,应力增量步距越大,突变启动应力越小,而变形能密度增量突变幅度与应力增量步距成反比;峰后阶段不同增量步距条件下的变形场增量演化均为峰后初期非线性波动,临近破坏发生突变,应力增量步距越大,突变幅度越大。Limestone specimens were selected to carry out uniaxial compression tests. Based on the digital speckle correlation method(DSCM), the deformation field was observed, the incremental analysis method was used to calculate the three index increments of non-uniformity index, deformation energy density and deformation field under different stress increments. The evolution characteristics of pre-peak and post-peak stages of rock were studied. The results show that the stress is basically the same when the deformation localization starts in the pre-peak stage, the spatial non-uniformity evolution suddenly increases and the deformation energy density mutation. The nonlinear mutation amplitude of the non-uniformity index increment is proportional to the stress increment step. The larger the stress increment step is, the smaller the mutation starting stress is, while the mutation amplitude of deformation energy density increment is inversely proportional to the stress increment step. The incremental evolution of deformation field under different incremental steps in the post-peak stage is nonlinear fluctuation in the early post-peak stage, and the mutation occurs near the failure. The larger the stress increment step is, the larger the mutation amplitude is.

关 键 词：数字散斑相关方法 变形演化 单轴压缩 增量分析 

分 类 号：TD315[矿业工程—矿井建设]