Multi-physics numerical analyses for predicting the alterations in permeability and reactive transport behavior within single rock fractures depending on temperature, stress, and fluid pH conditions
Multi-physics numerical analyses for predicting the alterations in permeability and reactive transport behavior within single rock fractures depending on temperature, stress, and fluid pH conditions
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多物理数值分析，用于预测单个岩石裂缝内渗透率和反应输运行为随温度、应力和流体 pH 条件的变化
DOI：
10.1016/j.sandf.2022.101207
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发表时间：
2022
影响因子：
3.7
通讯作者：
Kishida Kiyoshi
中科院分区：
文献类型：
--
作者：
Ogata Sho;Nishira Eita;Yasuhara Hideaki;Kinoshita Naoki;Inui Toru;Kishida Kiyoshi
当前研究的目的是建立一个经过验证的数值模型，用于根据热-水力-机械-化学 (THMC) 耦合条件下的流体 pH 值来解决岩石裂缝内渗透率和反应输运行为的变化。首先，提出了多物理反应输运模型，考虑了取决于温度、应力和流体化学条件（例如流体pH和溶质浓度）的地球化学反应，以及这些反应驱动的岩石裂隙渗透率的变化，然后通过解决一维反应输运问题作为基本基准来验证模型实现的正确性。其次，通过使用去离子水 (pH ~ 6) 和 NaOH 水溶液 (pH ~ 11) 作为渗透物在应力、温度升高的条件下进行两次流通实验，利用该模型复制单个花岗岩裂缝中演化渗透率和流出物元素浓度的测量结果，研究了该模型针对实际岩石裂缝的有效性。模型预测有效地跟踪了两个实验测量的裂缝渗透率随时间的变化。此外，预测还准确捕获了观察到的变化率差异，这可能导致两个实验之间流体 pH 值的差异。此外，就出水元素浓度而言，在所有测量目标元素中，大多数元素的浓度都被模型复制到了一个数量级的误差范围内。总的来说，可以得出结论，所开发的模型对于估计由地球化学反应引起的岩石裂缝内渗透率和反应输运行为的变化应该是有效的，这些变化取决于耦合 THMC 条件下的流体 pH 值。
The aim of the current study was to establish a validated numerical model for addressing the changes in permeability and reactive transport behavior within rock fractures based on the fluid pH under coupled thermal-hydraulic-mechanical-chemical (THMC) conditions. Firstly, a multi-physics reactive transport model was proposed, considering the geochemical reactions that depend on the temperature, stress, and fluid chemistry conditions (e.g., fluid pH and solute concentrations), as well as the changes in permeability in the rock fractures driven by these reactions, after which the correctness of the model implementation was verified by solving the 1D reactive transport problem as a fundamental benchmark. Secondly, the validity of the model against actual rock fractures was investigated by utilizing the model to replicate the measurements of the evolving permeability and the effluent element concentrations in single granite fractures obtained by means of two flow-through experiments using deionized water (pH ∼ 6) and a NaOH aqueous solution (pH ∼ 11) as permeants under stressed, temperature-elevated conditions. The model predictions efficiently followed the changes in fracture permeability over time measured by both experiments. Additionally, the observed difference in the changing rates, which may contribute to the difference in the fluid pH between the two experiments, was also captured exactly by the predictions. Moreover, in terms of the effluent element concentrations, among all the elements targeted for measurement, the concentrations of most elements were replicated by the model within one order of discrepancy. Overall, it can be concluded that the developed model should be valid for estimating the changes in permeability and reactive transport behavior within rock fractures induced by geochemical reactions which depend on the fluid pH under coupled THMC conditions.
高温高围压条件下花岗岩裂隙渗透率的演变
DOI：
10.2473/journalofmmij.128.72
发表时间：
2012
期刊：
Journal of Mmij
影响因子：
--
作者：
N. Kinoshita;H. Yasuhara
通讯作者：
H. Yasuhara
多物理场模拟预测单块岩石裂隙因地球化学效应而随 pH 条件变化的渗透率变化
DOI：
10.3208/jgssp.v09.cpeg045
发表时间：
2021
期刊：
Japanese Geotechnical Society Special Publication
影响因子：
--
作者：
Ogata Sho;Yasuhara Hideaki;Kinoshita Naoki;Kumagai Takeru;Inui Toru;Mishima Seiki;Kishida Kiyoshi
通讯作者：
Kishida Kiyoshi
法向载荷下轴对称凹凸体压溶变形的数值模拟
DOI：
10.1144/sp284.13
发表时间：
2007
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Y. Bernabé;B. Evans
通讯作者：
B. Evans