【摘要】 针对深埋地下洞室群动力时程分析中建模范围和人工边界设置问题,基于地下洞室群地震波动场的分布特征,提出一种动力时程分析中洞室群模型人工边界的设置方法。该方法允许模型不建至地表,而采用解析法求解地表反射波动场,并通过人工边界入射至模型。基于波场分离原理,使模型四周边界仅透射外行散射波,保障模型四周边界的计算精度。理论试验和实际工程计算表明,该方法计算精度较高,能满足地下洞室群动力时程计算对人工边界的精度要求,同时有效减少模型单元量,缩短动力时程的求解耗时。更多还原

【Abstract】 The issues of choosing proper intercepted range of dynamic analysis model and its artificial boundary setting were discussed.Based on the distribution characteristics of seismic wave field of underground caverns,the setting method for artificial boundary used in time history analysis of underground caverns was presented,which allowed the free surface not to be covered by analysis model.The wave field reflected by free surface was calculated using analytical method and then incident into analysis model through artificial boundary.Based on wave field separation principle,artificial boundary surrounding the analysis model could well absorb outgoing scattered wave to guarantee the accuracy of computation.The theoretical test and practical case calculation indicated that the presented method is sufficiently accurate and able to meet the requirements of time history analysis of underground caverns.Meanwhile,the amount of computation can be considerably reduced and the time-consuming is lowered accordingly.更多还原