The Investigation of Normal Fault under Upwelling Force and Its Critical Stress State
详细信息
- 责任者：Song Suihong (College of Geosciences ; China University of Petroleum ; Beijing 102249 ; China) ; Chen Shuping
- 刊名：Journal of Geomechanics
- 出版年：2012
- 卷期：18(2)
- 关键词：正断层 ; normal faults ; 断裂力学 ; fracture mechanics
- 页码：p.149-157
- 图表：4 illus., 12 refs.
- 分类号：0300
- issnNo：ISSN1006-6616
- isbnNo：CN11-3672/P
摘要
Based on the theory of parabolic Mohr failure envelope, and certain assumptions, mathematical derivation and theory modeling being carried out, quantitative functions of geometric shape of normal fault and its critical stress state were given. It is found that the fault dip becomes smaller from shallow to deep, being a listric fault. The rate of dip change is only related to the properties of strata. And the rate of dip change is faster in isotopic sandstone than in mudstone. It is also proved that the depth of the fault is linear against the amplitude of upwelling force. A typical ramp-flat normal fault can be drawn from the fracture modeling of interbedded sandstone-mudstone rock body.