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本文结合工程详细地论述了成拱条件及拱体受力机制．指出：加深对成拱效应的理解，有助于理解应力在土木工程中的分布情况，提高我们的理论与设计水平．
In this paper, the arching condition and the mechanism of the arch body stress are discussed in detail. It is pointed out that deepening the understanding of the arching effect helps to understand the distribution of stress in civil engineering and improve our theoretical and design levels.