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首页> 外文期刊>Pure and Applied Geophysics >Mechanism Damage to Mode-I Fractured Sandstone from Chemical Solutions and Its Correlation with Strength Characteristics
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Mechanism Damage to Mode-I Fractured Sandstone from Chemical Solutions and Its Correlation with Strength Characteristics

机译：从化学溶液和强度特性的相关性损坏模式 - I裂缝砂岩的机理损伤及其相关性

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The fracture toughness of rock is very important in rock cutting, blasting, and hydraulic fracturing for tunnel excavation. To evaluate factors that reduce rock fracture toughness, we emulated the environment of joint rock in the hydro-fluctuation belt of a typical bank slope in the Shanxi Tong Chuan reservoir region. We tested long-term immersion of sandstone samples in different chemical solutions to determine the resulting mechanical characteristics and damage degradation. Variations in the physical and mechanical properties of the samples were analyzed under the effects of the chemical solutions. Experimental results show that the sandstone was significantly damaged by the chemical solutions, but its peak strain increased, and different chemical solutions had distinct influences on the degree of mechanical damage. These differences varied with the acid-base properties of the solutions. Also, there were clear consistencies among the solutions in the degree of their damage to mechanical parameters, physical parameters, and ion concentrations. Therefore, we were able to obtain correlations among the physical and mechanical parameters of the sandstone samples, damage variables, and the ion concentrations of calcium and magnesium. The surfaces of the samples were seriously degraded after being subjected to the corrosive effect of various chemicals; for example, there were different amounts of holes and pitting corrosion. The sizes of the holes and the degree of surface pitting gradually increased with an increase in corrosion time.
机译：岩石的断裂韧性在隧道开挖的岩石切割、爆破和水力压裂中非常重要。为了评估降低岩石断裂韧性的因素，我们模拟了山西铜川库区典型岸坡水力起伏带中节理岩石的环境。我们测试了砂岩样品在不同化学溶液中的长期浸泡，以确定由此产生的机械特性和损伤降解。在化学溶液的影响下，分析了样品物理和机械性能的变化。实验结果表明，化学溶液对砂岩的损伤明显，但峰值应变增加，不同的化学溶液对砂岩的机械损伤程度有明显的影响。这些差异因溶液的酸碱性质而异。此外，溶液对机械参数、物理参数和离子浓度的破坏程度也存在明显的一致性。因此，我们能够获得砂岩样品的物理和力学参数、损伤变量以及钙和镁离子浓度之间的相关性。样品在受到各种化学物质的腐蚀作用后，表面严重退化；例如，有不同数量的孔和点蚀。随着腐蚀时间的延长，孔的尺寸和表面点蚀程度逐渐增加。

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