Based on the China’s first large underground crude oil storage caverns,through applying discrete element method it simulates primary masonry forms of the chamber during the construction period under different drainage conditions,the stability of lining under different drainage conditions is studied,and the value of water pressure on lining is determined. The research results have been used in the construction process, which proves the validity of the research in engineering practice.%以国家首个大型水封石洞油库为背景，采用离散单元法，模拟了洞室施工期不同排水条件下的衬砌形态，对不同排水条件下的衬砌进行稳定性研究，确定了作用在衬砌上水压力控制范围，并将其运用于施工过程中，证明了该研究在工程实践中的有效性。
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