水–岩化学作用对砂岩力学特性影响的三维离散元分析

doi:10.13722/j.cnki.jrme.2022.0560

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摘要水–岩化学作用下岩石发生力学性质劣化，其重要原因是岩石胶结物在水溶液中发生不同程度的溶解。在合理假设的基础上，提出一种改进的离散元三维胶结接触模型，在胶结尺寸相关的离散元接触模型中引入易溶解胶结比例和与水化程度相关的胶结宽度系数，来考虑水溶液对随机分布的易溶解胶结物的溶解作用。将该模型植入离散元进行砂岩的常规和水化后微观参数的标定，对不同水化程度砂岩的单轴和三轴压缩试验进行数值模拟，得到应力–应变曲线以及微观信息，并从宏微观角度分析水化作用对力学特性的影响。模拟结果表明：水化砂岩压缩试验中，以胶结的拉剪和拉弯破坏为主，且水化作用对拉破坏胶结数影响非常大，对压弯破坏影响很小。随着水化程度的加剧，岩石表面宏观裂纹数量增多，有由一条贯穿裂缝向多条裂缝发展的变化趋势；岩石的储能极限大幅降低，颗粒弹性能与胶结弹性能的储能极限和增速有不同程度的下降，胶结弹性能的储能极限有下降到一定程度后趋于稳定的趋势；随着易溶胶结占比的提高，水化岩石的峰值强度和弹性模量对胶结宽度的敏感性提高，当该占比为50%时岩石强度不到完好岩石的1/3，力学性能大幅下降。

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	王琪1
	王华宁1
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	蒋明镜2
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关键词 ：岩石力学, 离散元, 水&ndash, 岩化学作用, 胶结模型

Abstract：The main reason for the deterioration of rock mechanical properties under water-rock chemical reaction is that the rock cement is dissolved in an aqueous solution to varying degrees. This paper proposes an improved discrete element three-dimensional cementation contact model based on reasonable assumptions. In the size-dependent discrete element contact model，the soluble bond proportion and the bond width coefficient related to chemical damage degree are introduced to consider the dissolution of water solution to randomly distributed soluble cement. The model is implanted into the discrete element to calibrate sandstone’s conventional and micro parameters after chemical damage. The uniaxial and triaxial compression tests of sandstone with different chemical damage degrees are numerically simulated. The stress-strain curves and micro information are obtained，and the influence of chemical damage on mechanical properties is analyzed from the macro and micro points of view. The simulation results show that the compression test of chemical damage sandstone is dominated by tensile shear and tensile bending failure，while the water-rock chemical reaction has a great influence on the bond number of tensile failure and little influence on compressive bending failure. With the increase in chemical damage degree，the number of macro cracks on the rock surface increases，and there is a changing trend from one through a crack to multiple cracks. The energy storage limit of rock is greatly reduced，and the energy storage limit and growth rate of elastic energy are reduced to varying degrees. The energy storage limit of bonded elastic energy tends to be stable after falling to a certain extent. With the increase of soluble bond proportion，the sensitivity of peak strength and elastic modulus of chemical damage rock to bond width increases. When the proportion is 50%，the rock strength is less than 1/3 of intact rock，while the mechanical properties decrease significantly.

Key words： rock mechanics discrete element method water-rock chemical reaction bond model

引用本文:

王琪1，王华宁1，2，蒋明镜2，3，4. 水–岩化学作用对砂岩力学特性影响的三维离散元分析[J]. 岩石力学与工程学报, 2023, 42(S1): 3344-3354.
WANG Qi1，WANG Huaning1，2，JIANG Mingjing2，3，4. Three-dimensional discrete element analysis of mechanical properties of sandstone considering water-rock chemical reaction. , 2023, 42(S1): 3344-3354.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0560 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3344

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