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  曾金艳,李自红,陈文.基于FLAC3D数值模拟的清徐地裂缝与交城断裂成因关系研究[J].震灾防御技术,2020,15(1):114-122, DOI:10.11899/zzfy20200111.

基于FLAC3D数值模拟的清徐地裂缝与交城断裂成因关系研究
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。
作者单位
曾金艳 山西省地震局, 太原 030021
太原大陆裂谷动力学国家野外科学观测研究站, 太原 030025 
李自红 山西省地震局, 太原 030021
太原大陆裂谷动力学国家野外科学观测研究站, 太原 030025 
陈文 北京美辰建筑抗震工程有限公司, 北京 100021 
关  键  词:清徐  交城断裂  地裂缝  数值模拟  成因关系
DOI:10.11899/zzfy20200111
基金项目:山西省重点研发计划(201603D321124);山西省地震局科研项目(SBK-2040-03)
收稿日期:2019-04-11
作者简介:曾金艳,女,生于1970年。硕士,高级工程师。主要从事活动构造、工程地震和地球物理勘探工作。E-mail:13903412202@163.com
通讯作者:李自红,男,生于1969年。博士,正研级高级工程师。主要从事活动构造、地震工程和地震预测研究。E-mail:sxsdzjgcy@163.com
Study on Genetic Relationship between Qingxu Ground Fissure and Jiaocheng Fault by FLAC3D Numerical Simulation
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.
Keywords:  Qingxu  Jiaocheng fault  Ground fissure  Numerical simulation  Genetic relationship
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