NUMERICAL SIMULATION OF STRUCTURAL FRACTURES CONTROLLED BY PIQIANG STRIKE-SLIP FAULT
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摘要: 在深入探讨皮羌走滑断裂对构造裂缝控制作用的基础上，应用ANSYS有限元方法，模拟区域差应力、走滑断裂宽度和走向等因素影响下构造裂缝分布发育的规律。模拟结果表明，构造裂缝带宽随区域差应力增大呈线性增大，随断裂带宽度增大呈线性减小，随断裂走向与区域差应力夹角增大呈线性减小；施加的区域差应力值是影响构造裂缝发育的主要因素。Abstract: Based on the intensive research on development of structural fractures that controlled by the Piqiang strike-slip fault, this paper has simulated the distribution of structural fractures under the influence of the regional deviatoric stress, the width and trend of the strike-slip fault through the "ANSYS" finite element method. The simulating results indicated that the width of the fractures increased linearly with the increase of the regional deviatoric stress, decreased linearly with the increase of the width of the faulted belt, and decreased linearly with the increase of the angle between regional deviatoric stress and the fault trend. The regional deviatoric stress is the main factor that controls the development of the fractures.
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图 1 巴楚区域地质及皮羌断裂位置图
Qp3-Qh—上更新统—全新统；Qp2—中更新统；N-Qp1—新近系—下更新统；E—古近系；C-P—石炭-二叠系；D—泥盆系；S—志留系；C-O—寒武系—奥陶系；r—华力西期花岗岩
Figure 1. The regional geological map of Bachu and local map of Piqiang strike-slip fault
图 2 皮羌断裂控制构造裂缝分布发育规律
Figure 2. The distance-surface density fitting chart of Piqiang strike-slip fault
图 3 皮羌走滑断裂及研究区域的地质模型
Figure 3. Geological model of Piqiang strike-slip fault and the study area
图 4 皮羌走滑断裂及研究区域的平面力学模型
Figure 4. Plane mechanical model of Piqiang strike-slip fault and study area
图 5 改变施加的区域差应力条件下构造裂缝分布发育图
Figure 5. The distribution of the tension fractures under the influence of the deviatoric stress
图 6 改变断裂带宽度条件下构造裂缝分布发育图
Figure 6. The distribution of the tension fractures under the influence of the width of the strike-slip fault
图 7 改变断裂走向条件下构造裂缝分布发育图
Figure 7. The distribution of the tension fractures under the influence of the trend of the strike-slip fault
表 1 不同影响因素下张裂缝发育带宽度统计
Table 1. The data of the width of tension fracture and the influence factor
表 2 张裂缝发育各影响因素拟合公式斜率和相关系数
Table 2. The data of the slope and the correlation coefficient
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