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为了缓解涵顶土压力集中、减少涵洞结构病害,改进了涵洞结构形式.提出一种新型减载式涵洞结构,利用数值模拟分析了减载式涵洞土压力和内力的分布规律.在此基础上建立理论分析模型,推得减载式涵洞涵顶土压力计算式,对比分析结果表明理论计算结果与数值模拟结果一致.此外,通过数值模拟分析了各因素对涵洞结构受力状态的影响.研究结果表明:与一般的减载措施相比,减载式涵洞可以明显降低涵顶垂直土压力,有效减小涵洞侧墙和顶板的最大弯矩,使涵洞结构受力更加合理.
In order to alleviate the stress concentration on the culvert and reduce the culvert structure and improve the form of culvert structure, a new type of culvert structure is proposed, and the distribution law of earth pressure and internal force on the culvert is analyzed by numerical simulation The theoretical analysis model is established to deduce the formula of earth pressure on the culvert roof of the culvert, and the results of the comparative analysis show that the theoretical calculation results agree well with the numerical results. In addition, the influence of various factors on the stress state of the culvert structure is analyzed by numerical simulation The results show that, compared with normal load shedding measures, the load-bearing culvert can obviously reduce the vertical earth pressure at the culvert and effectively reduce the maximum bending moment of the side walls and roof of the culvert, which makes the stress of the culvert structure more reasonable.