A super-critical stress model for polymodal faulting of rocks
文献类型：期刊论文
| 作者 | Cai, Jianxin |
| 刊名 | JOURNAL OF GEODYNAMICS
 |
| 出版日期 | 2019 |
| 卷号 | 130页码:12 |
| 关键词 | Failure Fracture pattern Polymodal faulting Super-critical stress Cohesion strength |
| DOI | 10.1016/j.jog.2019.06.003 |
| 英文摘要 | A polymodal faulting phenomenon is further explored here that comprises penecontemporaneous fractures showing finite dispersion of strikes and dips with poles confined in one annular or two arc regions in stereo graphic projection. The fracture pattern represents three-dimensional strain of rocks with characteristics distinct from previously known bi-, four- or poly-modal faulting, and thus is unable to be interpreted in terms of the corresponding theories such as conjugate faulting, slip on preexisting weak planes and tensile crack interaction, respectively. Here, a super-critical stress model is advanced to decode stress significance of the specific fracture pattern with a particular emphasis on model prediction for orientations of failure surfaces. The model is an extension of the slip model of Reches (1983) that prescribes formation of four sets of faults in orthorhombic symmetry conforming to the Coulomb-Mohr criterion of tau=C+mu sigma (equivalent to C=F=tau-mu sigma where C is cohesion of rocks and F is function of shear stress tau, normal stress sigma and friction coefficient it). The mechanic boundary condition means a super-critical stress state (F-max > C) because stress resolution allows only two sets of planes to coevally have maximum value of F and thus shear fail equally according to Andersonian (1905, 1951) conjugate faulting derivation that corresponds to a critical stress state, i.e., F-max is just equal to C. This super-critical stress state further means that there are some planes on which F > C certainly on verge of faulting at least possessing a not even lower tendency than those planes on which C=F, and thus polymodal faulting results. The planes with F >= C tend to be areal distribution with arc or annular geometry in stereographic projection of poles. Given the Coulomb-Mohr friction and failure criteria are not fundamentally different, the supercritical model may also apply to initial failure of intact rocks. The new model represents a major reorganization in thinking about shear failure of rocks and fracturing patterns. Several natural examples are provided with fracture patterns fit to the super-critical model proposed here. |
| 资助机构 | Marginal Sea Opening Foundation [MSGL 12-06]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41572184] ; Marginal Sea Opening Foundation [MSGL 12-06]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41572184] |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18265]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 推荐引用方式 GB/T 7714 | Cai, Jianxin. A super-critical stress model for polymodal faulting of rocks[J]. JOURNAL OF GEODYNAMICS,2019,130:12, 21. |
| APA | Cai, Jianxin.(2019).A super-critical stress model for polymodal faulting of rocks.JOURNAL OF GEODYNAMICS,130,12. |
| MLA | Cai, Jianxin."A super-critical stress model for polymodal faulting of rocks".JOURNAL OF GEODYNAMICS 130(2019):12. |
入库方式： OAI收割
来源：南海海洋研究所
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