Study on Genetic Relationship between Qingxu Ground Fissure and Jiaocheng Fault by FLAC3D Numerical Simulation
-
摘要: 基于断裂力学理论，应用FLAC3D数值模拟方法对交城断裂活动时附近土体的变形特征进行模拟计算。计算结果表明：断层活动带动上覆土层差异沉降及应力场变化，当断层错动量达到一定程度，断层附近出现拉应力区，土体在拉张应力和自身重力作用下产生垂直差异形变，从而产生地裂缝。将数值模拟结果与方山探槽揭示的地裂缝剖面特征进行对比，二者结果相互印证，说明清徐地裂缝是交城断裂活动的结果，二者具有明显的对应关系，地裂缝为构造成因裂缝。数值模拟结果为研究断裂和地裂缝成因关系提供了佐证。Abstract: Based on fracture mechanics theory,this paper used the FLAC3D numerical simulation method to simulate the deformation characteristics of soils near Jiaocheng fault. The results show that the fault activity caused the differential settlement and the stress field change of the overlying soil. When the fault rupture reaches a certain level,a tensile stress zone appears near the fault. Under the action of tensile stress and gravity,the soils undergo vertical differential deformation,which causes ground fissures. Comparing the numerical simulation results with the profile characteristics of ground fissures revealed by the trench,the two results confirm each other. It further shows that the Qingxu ground fissures are the result of the Jiaocheng fault activity,and there are obvious corresponding relationships. The ground fissures are structural origin fissures. The numerical simulation results provide another evidence for the study of the genetic relationship between faults and ground fissures.
-
Key words:
- Qingxu /
- Jiaocheng fault /
- Ground fissure /
- Numerical simulation /
- Genetic relationship
-
图 2 断层不同位移下的垂直位移云图
Figure 2. Vertical displacement cloud map under different displacements of faults
图 3 断层不同位移下的水平位移云图
Figure 3. Horizontal displacement cloud map under different displacements of faults
表 1 模型材料及参数
Table 1. Model materials and parameters
层号 容重
/kg·m-3弹性模量
/MPa泊松比 体积模量
/MPa切变模量
/MPa内聚力
/MPa内摩擦角
/(°)G1(卵砾石) 2000 19 0.32 17.60 7.20 32 36 G2(砂岩) 2550 21000 0.20 11666.67 8750.00 1700 70 
下载: 导出CSV
-
陈育民, 徐鼎平, 2009.FLAC/FLAC3D基础与工程实例.北京:中国水利水电出版社. 江娃利, 郭慧, 谢新生等, 2017.山西交城活动断裂带分布图(1:50000)说明书.北京:地震出版社. 姜振泉, 王晓波, 张京, 1997.山西断陷带地裂缝的成因及其发育条件.中国矿业大学学报, 26(3):74-78. doi: 10.3321/j.issn:1000-1964.1997.03.018 李自红, 刘鸿福, 曾金艳等, 2012.基于分形理论的地裂缝成因机制研究.震灾防御技术, 7(1):46-53. doi: 10.3969/j.issn.1673-5722.2012.01.005 门玉明, 彭建兵, 李寻昌, 2007.山西清徐县地裂缝灾害现状及类型分析.工程地质学报, 15(4):453-457. doi: 10.3969/j.issn.1004-9665.2007.04.004 瞿伟, 张勤, 李振洪等, 2013.山西清徐地裂缝构造活动参数反演.武汉大学学报(信息科学版), 34(8):421-425. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=whchkjdxxb201304011 石玉玲, 门玉明, 彭建兵等, 2008.西安城区地裂缝破裂扩展的数值模拟.水文地质工程地质, 35(6):56-60. doi: 10.3969/j.issn.1000-3665.2008.06.013 王来贵, 初影, 赵娜, 2010.采煤引起地表裂缝数值模拟研究.沈阳建筑大学学报(自然科学版), 26(6):1138-1141. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=syjzgcxyxb201006021 王卫东, 苏刚, 易学发, 1998.西安地裂缝的数值模拟研究.灾害学, (3):33-37. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=zhx199803007 王秀文, 郭跃宏, 范雪芳, 2001.山西地区近期垂直形变场分析.地壳形变与地震, 21(2):64-69. doi: 10.3969/j.issn.1671-5942.2001.02.010 赵晋泉, 曾金艳, 程新原等, 2008.山西省清徐县境内交城断裂带、地裂缝勘察及地震活性评价报告.山西省地震工程勘察研究院. -
点击查看大图
图(5) / 表(1)
计量
- 文章访问数: 59
- HTML全文浏览量: 38
- PDF下载量: 5
- 被引次数: 0
