Deformation and failure characteristics and fracture evolution of cryptocrystalline basalt
文献类型：期刊论文
| 作者 | Liu, Zhenjiang; Zhang, Chuanqing; Zhang, Chunsheng; Gao, Yang; Zhou, Hui; Chang, Zhaorong |
| 刊名 | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
 |
| 出版日期 | 2019 |
| 卷号 | 11期号:5页码:990-1003 |
| 关键词 | Baihetan hydropower station Cryptocrystalline basalt Deformation and failure characteristics Characteristic strengths Crack propagation evolution |
| ISSN号 | 1674-7755 |
| DOI | 10.1016/j.jrmge.2019.04.005 |
| 英文摘要 | Cryptocrystalline basalt is one of the two major types of rocks exposed in the super large-scale underground powerhouse in Baihetan hydropower station in China. The rock of this type shows various site-specific mechanical responses (e.g. fragmentation, fracturing, and relaxation) during excavation. Using conventional triaxial testing facility MTS 815.03, we obtained the stress-strain curves, macroscopic failure characteristics, and strength characteristics of cryptocrystalline basalt. On this basis, evolution of crack initiation and propagation was explored using the finite-discrete element method (FDEM) to understand the failure mechanism of cryptocrystalline basalt. The test results showed that: (1) under different confining stresses, almost all the pre-peak stress-strain curves of cryptocrystalline basalt were linear and the post-peak stresses decreased rapidly; (2) the cryptocrystalline basalt showed a failure mode in a form of fragmentation under low and medium confining stresses while fragmentation-shear coupling failure dominated at high confining stresses; and (3) the initial strength ratio (sigma(ci)/sigma(f), where sigma(ci) and sigma(f) are the crack initiation strength and peak strength, respectively) ranged from 0.45 to 0.55 and the damage strength ratio (sigma(cd)/sigma(f), where sigma(cd) is the crack damage strength) exceeded 0.9. The stress-strain curve characteristics and failure modes of cryptocrystalline basalt could be reflected numerically. For this, FDEM simulation was employed to reveal the characteristics of cryptocrystalline basalt, including high sigma(cd)/sigma(f) values and rapid failure after sigma(cd), with respect to the microscopic characteristics of mineral structures. The results showed that the fragmentation characteristics of cryptocrystalline basalt were closely related to the development of tensile cracks in rock samples prior to failure. Moreover, the decrease in degree of fragmentation with increasing confining stress was also correlated with the dominant effect of confining stress on the tensile cracks. (C) 2019 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000489236600008 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/14868]  |
| 专题 | 岩土力学所知识全产出_期刊论文 国家重点实验室知识产出_期刊论文 |
| 作者单位 | 1.PowerChina Huadong Engn Corp Ltd, Hangzhou 310014, Zhejiang, Peoples R China; 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China; 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China; 4.Shenyang Univ Technol, Sch Architecture & Civil Engn, Shenyang 110870, Liaoning, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Zhenjiang,Zhang, Chuanqing,Zhang, Chunsheng,et al. Deformation and failure characteristics and fracture evolution of cryptocrystalline basalt[J]. JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,2019,11(5):990-1003. |
| APA | Liu, Zhenjiang,Zhang, Chuanqing,Zhang, Chunsheng,Gao, Yang,Zhou, Hui,&Chang, Zhaorong.(2019).Deformation and failure characteristics and fracture evolution of cryptocrystalline basalt.JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,11(5),990-1003. |
| MLA | Liu, Zhenjiang,et al."Deformation and failure characteristics and fracture evolution of cryptocrystalline basalt".JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 11.5(2019):990-1003. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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