构造应力场研究对宁晋盐穴储气库工程的建设具有重要意义。总结研究区地质条件和岩石力学参数,采用ANSYS模拟软件建立构造应力场有限元模型,通过构造应力场解析确定约束条件及边界条件,分析研究宁晋盐穴储气库现今地应力分布特征。结果表明:研究区古构造应力场具NW-SE向伸展拉张特征,现今构造应力场主体已恢复到NEE向挤压状态,局部主应力接近EW向;构造应力整体随深度增大,三向主应力之间呈SV＞SH＞Sh,区域应力属于上覆岩体主导的自重应力场;研究区地下0~7 000 m范围内,最大主应力值范围为0～160 MPa,中间主应力值范围为0～130 MPa,最小主应力值范围为0～125 MPa;区域断层的应力释放作用导致其附近的主应力值偏低,而盐岩的各向同性造成其主应力差低于围岩。
The study of tectonic stress field has important significance for the construction of Ningjin salt cavern gas storage project.Summarize the geological conditions and rock mechanics parameters of the study area, establish the finite element model of the tectonic stress field using the ANSYS simulation software, determine the constraint conditions and boundary conditions through the analysis of the tectonic stress field, and analyze and study the current crustal stress distribution characteristics of the Ningjin salt cavern gas storage.The results show:The ancient tectonic stress field in the study area exhibits NW-SE extensional characteristics, and the main body of the current tectonic stress field has returned to a NEE compressive state, with local principal stresses approaching EW direction; The overall tectonic stress increases with depth, and the three directional principal stresses show SV>SH>Sh. The regional stress belongs to the self weight stress field dominated by the overlying rock mass; Within the range of 0~7 000 meters underground in the research area, the maximum principal stress range is 0~160 MPa, the intermediate principal stress range is 0~130 MPa, and the minimum principal stress range is 0~125 MPa; The stress release effect of regional faults leads to a low main stress value near them, while the isotropy of salt rock results in a lower main stress difference than the surrounding rock.
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