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本文结合前人研究对黔北地区的构造演化以及本文研究区内牛蹄塘组地层发育情况进行了梳理,通过对谢坝构造的牛蹄塘组地层的岩石进行力学分析并建立构造模型,运用混合离散及有限差分方法对研究区域的现今应力场进行研究和模拟并根据mohr-coulomb岩石破坏接近程度对裂缝的发育分布进行预测。研究结果显示,谢坝地区断裂附近因为背斜构造形态控制,形成张性的滑动面。断层所在位置的应力值为较低值的张性应力。而因为最小主应力方向是平行于背斜的轴部,区域内的断层附近的整体区域均是以压性应力为主。对于断裂及裂缝的发育对保存的破坏作用,北东-南西向断层的控制范围较大,而北西南东向断裂的破坏作用相对较弱,对保存条件影响较小。
In this paper, the tectonic evolution of Qianbei area and the stratigraphic development of Niutitang Formation in this study area are reviewed in combination with previous studies. Through the mechanical analysis of the Niutitang Formation strata in Xieba structure and the establishment of structural models, Mixed discrete and finite difference methods are used to study and simulate the current stress field in the study area and to predict the fracture distribution according to the mohr-coulomb proximity of rock failure. The research results show that the tension sliding surface is formed due to the control of the anticline structure in the vicinity of the Xieba area. The stress at the location of the fault is the lower value of the tensile stress. Because the direction of the minimum principal stress is parallel to the axis of the anticline, the whole area around the fault in the area is dominated by compressive stress. For the damage of fracture and fracture development to conservation, the control range of the NE-NW strike is relatively large, but the destructive effect of the north-southwest east fault is relatively weak, which has little impact on the preservation conditions.