基于LS——DYNA的隧道爆破模拟分析

发布时间：2018-05-31 07:41

本文选题：隧道 + 爆破　；参考：《公路》2017年08期

【摘要】：为了分析拟建隧道的爆破施工对已建隧道的影响,利用通用显式动力分析程序LS-DYNA对3种施工方法5种爆破方案进行了模拟。首先对全断面法施工方案进行了全面分析,给出了速度响应与应力响应分析结果,并指出该方案的不安全性。随后对台阶法和CD法的施工方案进行了拟建隧道与已建隧道间距不同情况下的爆破模拟,并给出了各自的力学响应结果。模拟计算克服了现有简化计算无法准确计算爆破荷载的缺点,准确给出了拟建隧道的爆破施工对已建隧道的影响。计算结果表明CD法在不同条件下均可满足安全要求,在爆破方案确定过程中,增加拟建隧道与已建隧道之间的距离是降低爆破对已建隧道影响的最好方法。
[Abstract]:In order to analyze the influence of the blasting construction of the proposed tunnel on the built tunnel, five blasting schemes of three construction methods were simulated by using the general explicit dynamic analysis program LS-DYNA. First, the construction scheme of full section method is analyzed, the results of velocity response and stress response are given, and the insecurity of the scheme is pointed out. Then the blasting simulation of the construction scheme of step method and CD method is carried out under the different distance between the planned tunnel and the existing tunnel, and the results of mechanical response are given. The simulation calculation overcomes the shortcoming that the existing simplified calculation can not calculate the blasting load accurately, and gives the influence of the blasting construction of the proposed tunnel on the built tunnel accurately. The results show that the CD method can meet the safety requirements under different conditions. In the process of determining the blasting scheme, increasing the distance between the proposed tunnel and the built tunnel is the best method to reduce the impact of blasting on the built tunnel.
【作者单位】：内蒙古交通设计研究院有限责任公司;
【分类号】：U455.6

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