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Abstract For the large steel vessel storing high-level radioactive waste buried in the deep underground engineering，the aseismic analysis of shielding structure from radioactivity is necessary in the long service time. On the base of analyzing the status aseismic for underground engineering，the method of combining the experiments and numerical simulation was put forward to aseismic analysis of the deep buried large scale vessel steel. After studying the observed seismic data in the basement rock，the rules of ground motion varying with depth were summarized，and the fitting curves between the amplitude ratio(acceleration，velocity and displacement) and depth were obtained. Based on above rules and curves，the investigation of active fault and the thought of the most unfavorable design ground motions，the design seismic ground motion at 300 deep m in the design site was received. It is modified from the records on the basement rock by the Loma Prieta earthquake taking place on October 18，1989. The elastoplastic Mohr-Coulomb(M-C) constitutive equation was selected to describe the bentonite and concrete，and the parameters of M-C were experimented on the Wille soil triaxial and rock triaxial apparatus respectively. At last，the seismic response of the shielding structure was analyzed with the finite element software ABAQUS. The results show that there are cracks between bentonite and steel vessel；plastic strain occurs in local region of bentonite layer； and the plastic strain of concrete layer is very small，which lies in the safety limit. The method in the paper is helpful for seismic design of underground engineering.
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Received: 28 June 2012
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2013, Vol. 32 
