Meso-Mechanical Characteristics of Granite with Natural Cracks after Mud Acid Corrosion
文献类型：期刊论文
| 作者 | Tong, Rongchen3,4,5; Liu, Hejuan3,4,5; Liu, Jianfeng2; Shi, Yingkun1; Xie, Lihuan3,4,5; Ban, Shengnan3,4,5 |
| 刊名 | ENERGIES
 |
| 出版日期 | 2022-02-01 |
| 卷号 | 15期号:3页码:19 |
| 关键词 | geothermal energy development granite mud acid solution particle flow code characteristic strength |
| DOI | 10.3390/en15030721 |
| 英文摘要 | Most of the discovered high-temperature geothermal energy systems are often related with granite that is characterized by natural faults, fractures and cracks of different size. However, the porosity and permeability of the granite matrix is very low, greatly limiting the efficiency of heat extraction in granitic rock. Chemical stimulation, which is regarded as one of the most important means of reservoir stimulation, has consequently received more and more attention. In this paper, a Triassic granite obtained from the eastern region of Liaoning Province in China was reacted with three different concentration of mud acid solution (8% HCl + 1% HF, 10% HCl + 2% HF, 12% HCl + 3% HF) and the resulting microstructure changes studied by scanning electron microscopy (SEM) and nuclear magnetic resonance (NMR). The experimental results show that the number of micropores in the granite increases after chemical corrosion by mud acid solution. A higher mud acid solution concentration results in a much higher pore volume. Triaxial compression tests on the granite before and after chemical corrosion were carried out to study the effect of acidification on the mechanical characteristics of granite, showing that the peak stress and elastic modulus of granite decreases 25.7% and 16.5%, respectively, after exposure to mud acid solution (12% HCl + 3% HF) corrosion for three weeks at room temperature. The particle flow program PFC2D based on discrete element method was used to investigate the mechanical response before and after the chemical corrosion. Considering that the granite is rich in microcracks, the study is simplified by considering them all grouped into one main closed fracture. The influences of main crack inclination angle, crack length, friction coefficient and confining pressure on the mechanical response were investigated. Under the triaxial compression loading state, wing cracks appear at the initial crack tip, then secondary cracks begin to appear. The sensitivity analysis shows that three characteristic strengths (crack initiation strength, damage strength and peak strength) are strongly correlated with crack length, crack inclination angle, crack surface friction coefficient and confining pressure. These three characteristic strengths decrease 60%, 59% and 53%, respectively, compared with their initial values with the increase of main crack length from 6 mm to 22 mm, while they present positive correlation with the fracture friction coefficient from 0 to 1.0 and confining pressure from 10 to 50 MPa. There is a critical inclination angle of the main crack (i.e., 45 degrees), meaning that these three characteristic strengths of granite decrease with inclination angles smaller than 45 degrees, while they increase with an inclination angle larger than 45 degrees. After the corrosion effect of mud acid solution on granite, the pore structure was changed and mechanical properties was damaged, which further affect the failure mode and failure process of granite samples affected by mud acid solutions. This paper provides a theoretical reference for evaluating the effect of chemical stimulation technology on the mechanical characteristics of granite, serving for the continuous hydraulic stimulation design after the chemical stimulation. |
| 资助项目 | Youth Project of National Natural Science Foundation of China[51809259] ; Youth Project of National Natural Science Foundation of China[41674180] ; CAS Pioneer Hundred Talents Program ; State Key Laboratory of Hydraulics and Mountain River Engineering[SKHL1917] ; Key Laboratory of Deep Earth Science and Engineering (Sichuan University), Ministry of Education[SESE202002] |
| WOS研究方向 | Energy & Fuels |
| 语种 | 英语 |
| 出版者 | MDPI |
| WOS记录号 | WOS:000760553500001 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/34562]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Liu, Hejuan |
| 作者单位 | 1.Shandong Hispeed Co Ltd, Jinan 250014, Peoples R China 2.Sichuan Univ, Coll Water Resource & Hydropower, Chengdu 610041, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, Hubei Key Lab Geoenvironm Engn, Wuhan 430071, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tong, Rongchen,Liu, Hejuan,Liu, Jianfeng,et al. Meso-Mechanical Characteristics of Granite with Natural Cracks after Mud Acid Corrosion[J]. ENERGIES,2022,15(3):19. |
| APA | Tong, Rongchen,Liu, Hejuan,Liu, Jianfeng,Shi, Yingkun,Xie, Lihuan,&Ban, Shengnan.(2022).Meso-Mechanical Characteristics of Granite with Natural Cracks after Mud Acid Corrosion.ENERGIES,15(3),19. |
| MLA | Tong, Rongchen,et al."Meso-Mechanical Characteristics of Granite with Natural Cracks after Mud Acid Corrosion".ENERGIES 15.3(2022):19. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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