本文提出了地震作用下列车正常行驶极限状态的概念，研究与之相应的最优可靠度问题。
In this paper, the conception of train-running limit state under earthquake is proposed, and the corresponding optimum reliability is studied.
在VII级烈度地震作用过程中输电塔各构件未达到极限应力状态，塔具有较好的抗震性。
Maximum stress of tower is lower than ultimate stress which reveals that the tower has a good resistance in VII magnitude intensity earthquake.
由于砂层厚度小于现有地震分辨率的极限，所以直接利用地震资料难以测定砂层厚度。
The sandstone thickness is less than the seismic resolution limit; therefore, it is difficult for us to determine the sandstone thickness with the use of seismic data.
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