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首先推导了基于刚性基底和弹性基底边界的一维土层模型的地震响应分析方法,并根据上述理论分析,得出了直接以竖向钻孔井下地震记录作为输入进行土层地震反应计算时,土层模型的边界应按刚性基底考虑的结论。然后设计了1个一维土层模型算例,采用DEEPSOIL和LSSRLI-1通用程序,以弹性基底边界条件分别进行土层地震响应分析,比较这2个程序的计算结果,验证了其一致性和可靠性;最后以某一深度处的地震响应为输入,建立与该深度匹配的刚性基底土层计算模型,使用DEEPSOIL程序对该模型进行计算,计算结果与前述结果完全一致,从而验证了直接使用井下台阵记录计算时,土层模型底部应选用刚性基底的结论,该结论将有助于正确利用地下强震记录进行土层地震响应分析。
Firstly, the seismic response analysis method of one-dimensional soil model based on the rigid substrate and the elastic substrate boundary is deduced. Based on the above theoretical analysis, the seismic response of the soil layer when the vertical seismic record is taken as input is obtained. The boundary of the soil model should be considered as a rigid base. Then, an example of one-dimensional soil model is designed and the generalized program of DEEPSOIL and LSSRLI-1 is used to analyze the seismic response of the soil layer with elastic substrate boundary conditions. Comparing the calculation results of the two procedures, the consistency and Finally, the seismic response at a certain depth is taken as the input to establish the calculation model of the rigid basement soil layer matching with the depth. The DEEPSOIL program is used to calculate the model. The calculation results are in good agreement with the above results, which verifies that the direct use When calculating the downhole array records, the conclusion that the rigid base should be used at the bottom of the soil model should be helpful for the correct use of the records of the earthquakes in the underground for the seismic response analysis of the soil layer.