地质力学学报2018，Vol.24Issue(1)：25-34,10.DOI:10.12090/j.issn.1006-6616.2018.24.01.003
鄂尔多斯地块南缘地应力测量研究
IN-SITU MEASUREMENTS IN THE SOUTHERN MARGIN OF THE ORDOS BLOCK
摘要
Abstract
The crustal stress distribution pattern and fault activity of the shallow crust in the southern margin of the Ordos block are studied by using the stress test data obtained from hydraulic fracturing method.The results reveal that the maximum and minimum horizontal principal stress show a good linear relationship with depth.The gradient is 0.032 and 0.021,respectively.Stress structure of SH ＞ Sh ＞ Sv is favorable for the activity of the reverse fault and that is different from the normal fault occurred in the 1556 Huashan earthquake.The direction of the maximum horizontal principal stress is NS-NNW,which is consistent with the direction of velocity vector field.It is different from regional tectonic stress direction interpreted by other data,which may be affected by the fault activity around the Ordos block.The crustal activity in the study area is discussed by using the Mohr-Coulomb criterion and Byerlee's law under the premise that the friction coefficient is 0.6 ～ 1.0.We found that the measured points in the southern margin of Ordos block have not reached or exceeded the limit of the earth's crust rupture and there are no fault instability or earthquake and other forms of the activities,which is in a relatively stable state of crustal stress.New in-situ stress measurement data have been added to the area.The research results provide the boundary conditions for the engineering design and construction,numerical simulation of tectonic stress field in the area,which is of great significance for the study of geological hazard assessment,crustal stability and continental dynamics.关键词
鄂尔多斯地块南缘/水压致裂/地应力测量/地应力状态/构造应力场Key words
southern margin of the Ordos block/hydraulic fracturing/in-situ measurement/in-situ stress state/tectonic stress field分类
天文与地球科学引用本文复制引用
牛琳琳,丰成君,张鹏,陈群策,谭成轩..鄂尔多斯地块南缘地应力测量研究[J].地质力学学报,2018,24(1):25-34,10.基金项目
国家科技重大专项(2016ZX05034003-002) （2016ZX05034003-002）
中国地质调查局地质调查项目(DD20160267) （DD20160267）
国家自然科学基金青年科学基金项目(41702341) （41702341）
