基于DSCM增量分析的灰砂巖單軸壓縮變形場(chǎng)演化特征研究
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北方工業(yè)大學(xué) 土木工程學(xué)院

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TD801??

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國家自然科學(xué)基金資助項目(51774015)


Study on the Evolution Characteristics of Uniaxial Compressive Deformation Field of Limestone Based on DSCM Incremental Analysis
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North China University of Technology

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    摘要:

    開(kāi)展基于數字散斑相關(guān)方法(DSCM)的灰砂巖單軸壓縮變形場(chǎng)演化增量特征研究贷耳。選用灰砂巖試件開(kāi)展單軸壓縮試驗盟挤,在DSCM相關(guān)方法觀(guān)測變形場(chǎng)基礎上,采用增量分析方法計算得到不同應力增量條件下非均勻性、位移、變形能密度和最大剪應變等四個(gè)指標增量,對巖石峰前和峰后階段的演化特征進(jìn)行了研究。結果表明:(1)非均勻性、位移、變形能密度的突變啟動(dòng)應力一致。(2)經(jīng)增量分析,能量主要在變形局部化啟動(dòng)前后積累,應力為30 MPa附近積累速度先增加后減小,且曲線(xiàn)突變幅度與增量步距成反比。(3)應力增量步距不同,非均勻性指標演化規律相同桃徊,但步距越大,非線(xiàn)性突變幅度越大,突變啟動(dòng)應力越小。不同增量步距條件下的變形場(chǎng)增量演化均為峰后初期非線(xiàn)性波動(dòng),臨近破壞發(fā)生突變,突變幅度與增量步距成正比。

    Abstract:

    The evolution and increment characteristics of uniaxial compressive deformation field of limestone sandstone based on the digital speckle correlation method (DSCM) were studied. Based on the deformation field observed by DSCM correlation method, the increment analysis method was used to calculate the increment increment of four indexes, including non-uniformity, displacement, deformation energy density and maximum shear strain under different stress increment conditions, and the evolution characteristics of the rock in the pre-peak and post-peak stages were studied. The results show that: (1) The abrupt starting stresses of non-uniformity, displacement and deformation energy density are consistent. (2) According to the incremental analysis, the energy mainly accumulates before and after the deformation localization starts, and the accumulation velocity of stress around 30 MPa increases first and then decreases, and the abrupt change amplitude of the curve is inversely proportional to the incremental step distance. (3) The evolution law of the non-uniformity index is the same with different stress increment steps, but the larger the step distance, the larger the nonlinear mutation amplitude, and the smaller the mutation starting stress. The incremental evolution of the deformation field under different increment step conditions is a nonlinear fluctuation in the early stage after the peak, and the abrupt change occurs in the vicinity of failure, and the mutation amplitude is proportional to the incremental step length.

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  • 收稿日期:2024-04-23
  • 最后修改日期:2024-05-21
  • 錄用日期:2024-06-18
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