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大块石冲击是造成泥石流拦挡坝破坏的主要因素之一,为了提高拦挡坝的抗冲击能力,提出一种带连续防撞墩的新型泥石流拦挡坝。利用ANSYS/LS-DYNA,对泥石流大块石冲击新型坝和重力式拦挡坝进行了数值模拟,分别得出了新型坝和重力坝的冲击动力响应并进行对比分析。此外,考虑不同的防撞墩尺寸、布置间距以及不同的后部坝体厚度,对新型坝进行参数分析。结果表明:新型坝提高了自身抗冲击性能的同时还提高了材料强度利用率,其明显优于普通坝。防撞墩的截面高度、布置间距以及后部坝体的厚度对新型坝的抗冲击性能和整体刚度影响很大,因此在新型坝设计中必须综合考虑以上因素。
Large rock impact is one of the main factors causing debris flow dam damage. In order to improve the impact resistance of dam, a new type of debris flow dam with continuous anti-pier is proposed. By using ANSYS / LS-DYNA, the numerical simulation of debris flow impact of new block and gravel dam is carried out, and the impact dynamic responses of new dam and gravity dam are respectively obtained and compared. In addition, the parameters of the new dam are analyzed considering different sizes of anti-collision piers, arrangement spacing and different thickness of the back dam. The results show that the new dam improves its own impact resistance and improves the utilization ratio of material strength, which is obviously superior to ordinary dam. The cross-section height, arrangement spacing and the thickness of the rear dam have a great impact on the impact resistance and overall stiffness of the new dam. Therefore, the above factors must be taken into consideration in the design of the new dam.