周晓敏, 管华栋. 磁西矿千米深井不均匀原岩应力场有限元模型研究[J]. 工程力学, 2016, 33(增刊): 306-311. DOI: 10.6052/j.issn.1000-4750.2015.05.S039
引用本文: 周晓敏, 管华栋. 磁西矿千米深井不均匀原岩应力场有限元模型研究[J]. 工程力学, 2016, 33(增刊): 306-311. DOI: 10.6052/j.issn.1000-4750.2015.05.S039
ZHOU Xiao-min, GUAN Hua-dong. FEM ANALYSIS ON THE ORIGINAL NON-UNIFORM STRATA STRESS OF CIXI COLLIERY SHAFT OVER 1000M DEEP[J]. Engineering Mechanics, 2016, 33(增刊): 306-311. DOI: 10.6052/j.issn.1000-4750.2015.05.S039
Citation: ZHOU Xiao-min, GUAN Hua-dong. FEM ANALYSIS ON THE ORIGINAL NON-UNIFORM STRATA STRESS OF CIXI COLLIERY SHAFT OVER 1000M DEEP[J]. Engineering Mechanics, 2016, 33(增刊): 306-311. DOI: 10.6052/j.issn.1000-4750.2015.05.S039

磁西矿千米深井不均匀原岩应力场有限元模型研究

FEM ANALYSIS ON THE ORIGINAL NON-UNIFORM STRATA STRESS OF CIXI COLLIERY SHAFT OVER 1000M DEEP

  • 摘要: 从现代数值计算在地下工程中应用发展和新奥法理论的角度出发,提出了原岩应力场分析在现代地下工程设计方面的必要性。依据地层构造学,通过磁西副立井检查孔资料和地质构造条件,建立了基于重力场为基础的考虑地层倾斜、断层等构造下的磁西副立井广场下原岩应力分析模型,通过数值计算分析结果,图形化展示了不同垂直勘探线上三向应力随深度的变化规律,尽管三向应力都和深度成正比关系,但和解析解不同的是,在岩层界面和断层处水平和垂直应力都不是连续的,而且两向水平应力是不等的,二者之比最大值1.22发生在垂深613 m左右。正交统计分析得到,两向水平应力之比,即不均匀应力系数,它的第一影响因素是岩体剪切模量之比,第二影响因素是岩层倾角。在同一水平上,水平应力的变化也表现和地层倾斜方向高差相关联的关系,即倾斜上位的应力高于下位的应力,但应力梯度值不大,在10-3~10-4量级上,主要与岩层倾角有关,对地应力的评估差异不大。

     

    Abstract: According to the structure geology, geological condition and the inspection information of bore hole, the paper analyzes the original stress existing in the km depth of Cixi colliery production area using EFM model based on gravity principal and considering the dip and fault strata structure. With FEM results, the three dimensional stress state and the relationship between the vertical and horizontal inspection lines are graphically displayed. Although the three coordinate direction stress are proportional to the depth according to the analytic solution, the curve of stress vs. depth is not continues, which is interrupted at the fault and juncture of two kind of strata. The max ratio of the two cross horizontal stress is 1.22, which occurs at the depth of 613m. Based on orthogonal analysis, the ratio of the two cross directional stresses, called non-uniform coefficient, is affected mainly by the ratio of mutual shear modules, as well as the incline angle of strata. On the same level and same strata, the stress behavior is related to the incline state, and the stress in the uphill side is higher than that in the downhill by 10-3 to 10-4. The stress gradient is mainly related to the incline angle of strata and it does not influence the assessment of horizontal stress.

     

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