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| 1 | 2001年8.1级昆仑山大震破裂过程及对2008年汶川8.0级大震孕育发生影响的研究显示文摘本文用三维流变非连续变形(块体边界)与有限元(块体内)相结合(DDA+FEM)的方法,在青藏高原及其东侧四川盆地,鄂尔多斯块体地区三维构造块体相互制约的大环境中,考虑了龙门山断裂带东西两侧地势、地壳厚度和分层的明显变化,及断裂带东侧四川盆地及鄂尔多斯块体坚硬地壳阻挡的影响,通过用GPS资料做位移速率边界约束和震源机制约束,计算得到研究区的速度场和应力场与该地区GPS测量结果和震源机制分布结果基本相似.在此基础上,数值模拟2001年昆仑山大震的破裂过程;研究大震引起各构造块体边界断层应力状态变化特征,特别是对2008年汶川大震发震断层的影响.结果表明:(1)数值模拟昆仑山大震发震断层发生左旋走滑错动,最大水平错距约4.5 m,最大应力降约18 MPa.计算获得大震释放的主压应力场图像,最大剪应力变化等值线图,大震发震断层垂直面上位错等值线图及大震引起垂直位移变化三维图分别与大震的震源机制,地表破裂带同震位移分布,GPS同震位移图及地震波反演和GPS反演的结果总体上均比较相近.(2)计算获得的最大剪应力变化等值线图分布具有不对称特点,大震发震断层南侧变化梯度明显大于北侧.(3)模拟计算得到大震引起汶川大震发震断层库仑破裂应力增加约0.016 MPa(上地壳层).昆仑山大震破裂过程是在东昆仑断裂带其发震断层上发生的左旋走滑错动,引起东昆仑断裂带南侧巴彦喀拉块体进一步东扩和一定规模的变形,并受到该块体东侧四川盆地较硬地壳的阻挡,使得块体东边界断层中低倾角的汶川大震发震断层库仑破裂应力增大,应变能积累增强.可以认为这一破裂过程对汶川大震发震断层发生逆冲型失稳起了促进作用. | 陈祖安 林邦慧 白武明 程旭 王运生 | 2011 | 地球物理学报2011，54，1： | 12 |
| 2 | Discontinuous deformation and displacement analysis: From continuous to discontinuous显示文摘A discontinuous deformation and displacement(DDD) analysis method is proposed for modelling the rock failure process. This method combines the rock failure process analysis(RFPA) method(based on finite element method) and discontinuous deformation analysis(DDA) method. RFPA is used to simulate crack initiation, propagation and coalescence processes of rock during the small deformation state. The DDA method is used to simulate the movement of blocks created by the multiple cracks modelled by the RFPA. The newly developed DDD method is particularly suitable for modelling both crack propagation and block movement during the rock failure process because of the natural and convenient coupling of continuous and discontinuous deformation analyses. The proposed method has been used to simulate crack initiation, propagation and coalescence within a slope as well as the block movement during the landslide process. Numerical modelling results indicate that the proposed DDD method can automatically simulate crack propagation and block movement during the rock failure process without degrading accuracy. | TANG ChunAn TANG ShiBin GONG Bin BAI HongMei | 2015 | Science China(Technological Sciences)2015，58，9： | 6 |
| 3 | 汶川地震和芦山地震的孕震机理及震前中长期地震危险性研究显示文摘运用非连续变形分析法与三维有限元法相结合的方法,以GPS资料作为位移速率和震源机制的约束条件,通过数值模拟研究了青藏高原及其东侧邻区构造地块的运动、变形、相互作用及其与近30年来发生于该区的大地震之间的关系。研究中引入了以应力与摩擦强度的比值定义的断层'失稳危险度',通过数值模拟计算得到了研究区地壳块体边界断层的失稳危险度分布。结果表明,失稳危险度高的地段与近期该区发生的M_S≥7.0地震所在的位置基本一致,其中龙门山断裂带上包括汶川和芦山大地震的发震断层均为失稳危险度最高值地区。计算得到的应变率强度分布图显示,青藏高原东部边缘整条地带均为应变率强度的陡变带,特别是以龙门山断裂带上的陡变最为明显,其西侧应变率强度为东侧的近4倍,而且,这个带位于宽度相同、走向与龙门山断裂带走向相一致的高应变能密度带中,表明这两次大地震前,作为其发震断层的龙门山断裂带已积累了相当高的应变能,失稳危险度高,处于力学上的不稳定状态。模拟计算得到在上地壳层中,2001年昆仑山口西M_S8.1地震引起汶川、芦山地震发震断层的库仑破裂应力增加约0.016 MPa,相当于龙门山断裂带约两年的应力积累,也就是说,使汶川、芦山地震发震断层的失稳破裂提前了约两年。此外,关于2008年汶川M_S8.0地震的模拟计算表明,汶川地震的发生也使包括芦山地震发震断层的龙门山断裂带西南段和东昆仑断裂带东南端的库仑破裂应力增大,应变能积累增强,这说明汶川M_S8.0地震的发生对已处于失稳危险度较高状态的2013年芦山地震和2017年九寨沟地震发震断层的提前失稳破裂起到了促进作用。 | 林邦慧 陈祖安 白武明 程旭 | 2018 | 地震学报2018，40，3： | 1 |
| 4 | Numerical simulation for 1975 Haicheng and 1999 Xiuyan earthquake processes by DDA+FEM显示文摘In this paper, using discontinuous deformation analysis, we simulate numerically the processes of the 1975 Ha- icheng earthquake and the 1999 Xiuyan earthquake in the tectonic environment of North China where blocks re- strict each other by DDA+FEM. Based on the research on the distribution of foreshocks and recent aftershocks of Xiuyan earthquake and the results from our study and other study on Haicheng earthquake, we present a tectonic block model of Haicheng and Xiuyan earthquakes. The results from numerical simulation include the variation of principal stress field released by these two earthquakes, contour patterns of maximum shear stress change, varia- tion patterns of displacement vectors before and after the earthquakes and variation of the earthquake fault slip with time, which agree basically with the focal mechanisms, macroscopic isoseismal and horizontal displacement characters from observations. | 张瑞青 魏富胜 乔成斌 林邦慧 | 2005 | Acta Seismologica Sinica(English Edition)2005，18，2： | 0 |
| 5 | A Coupling Model of the Discontinuous Deformation Analysis Method and the Finite Element Method显示文摘Neither the finite element method nor the discontinuous deformation analysis method can solve problems very well in rock mechanics and engineering due to their extreme complexities. A coupling method combining both of them should have wider applicability. Such a model coupling the discontinuous deforma- tion analysis method and the finite element method is proposed in this paper. In the model, so-called line blocks are introduced to deal with the interaction via the common interfacial boundary of the discontinuous deformation analysis domain with the finite element domain. The interfacial conditions during the incre- mental iteration process are satisfied by means of the line blocks. The requirement of gradual small dis- placements in each incremental step of this coupling method is met through a displacement control proce- dure. The model is simple in concept and is easy in numerical implementation. A numerical example is given. The displacement obtained by the coupling method agrees well with those obtained by the finite ele- ment method, which shows the rationality of this model and the validity of the implementation scheme. | 张明 杨合庆 李仲奎 | 2005 | Tsinghua Science and Technology2005，10，2： | 0 |
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