CAJ | 학술논문

为对一次地震中可能造成的地表断裂位错作出较准确的估计,采用拟静力弹塑性有限元方法,分别对覆盖土层为粉质黏土和黏土情况下,走滑断层引发的地震地表断裂进行了数值模拟分析.根据历史震害数据回归拟合的震级 M 与基岩位错D基岩的关系式以及数值计算结果,建立了震级M与地表位错D地表的关系式.公式中考虑了土层厚度H对地表位错D地表的影响,而不仅仅局限于根据震级M的大小通过统计公式来估算地表断裂位错D地表.结果表明,走滑断层引发的地震地表断裂位错不仅与震级的大小有关,还与土层厚度和土层性质有关;在相同震级作用下,随着土层厚度的增加,地表位错逐渐减小;在相同震级和相同土层厚度下,上覆土层为粉质黏土时产生的地表位错要大于上覆土层为黏土时产生的地表位错;根据拟合的公式估计出不同震级情况下可不考虑走滑断层影响的临界覆盖土层厚度值,有助于提高活动断裂地震危险性评估工作的可靠性.
위대일차지진중가능조성적지표단렬위착작출교준학적고계,채용의정력탄소성유한원방법,분별대복개토층위분질점토화점토정황하,주활단층인발적지진지표단렬진행료수치모의분석.근거역사진해수거회귀의합적진급 M 여기암위착D기암적관계식이급수치계산결과,건립료진급M여지표위착D지표적관계식.공식중고필료토층후도H대지표위착D지표적영향,이불부부국한우근거진급M적대소통과통계공식래고산지표단렬위착D지표.결과표명,주활단층인발적지진지표단렬위착불부여진급적대소유관,환여토층후도화토층성질유관;재상동진급작용하,수착토층후도적증가,지표위착축점감소;재상동진급화상동토층후도하,상복토층위분질점토시산생적지표위착요대우상복토층위점토시산생적지표위착;근거의합적공식고계출불동진급정황하가불고필주활단층영향적림계복개토층후도치,유조우제고활동단렬지진위험성평고공작적가고성.
@@@@In order to estimate seismic surface rupture dislocation more accurately, the finite element method of pseudo-static elastoplasticity is used for numerical simulation to seismic surface rupture by strike-slip fault. In the numerical model, the two cases of silty clay and clay are discussed respectively. According to the relationship between magnitude M and bedrock dislocation Dbedrock which is regressed and fitted based on historical earthquake damage data and numerical calculation results, the relationship between magnitude M and surface dislocation Dsurface is set up. In the formula, the influence factor of soil thickness H is considered, and not just estimate surface rupture dislocation depending on magnitude by using statistical formula. The results show that:seismic surface rupture dislocation under strike-slip fault relates not only to magnitude, but to soil thickness and soil properties;Surface dislocation decreases gradually with the increasing of soil thickness under the same magnitude;Surface dislocation of silty clay is larger than that of clay under the same magnitude and soil thickness; The critical value of soil thickness without considering strike-slip fault is estimated based on the fitting formulas, and the result is helpful to improve the reliability of seismic risk evaluation of active fault.