水平层状岩体隧道爆破施工对临近隧道影响的DLSM模拟分析

摘要

It is undeniable that blasting working could have impact on adjacent tunnel excavated in horizontal layered rock mass. Based on the Dalin Tunnel in Ji-Huai high way project and a new calculation model DLSM (distinct lattice spring model), this study aims to simulate the numerical value and analysis the blasting vibration response of adjacent tunnel in layered rock mass. Due to DLSM, this study reproduces the process of stress wave propagation, deflection, refraction, superposition and dissipation and focuses on monitoring the dynamic response characteristics of the vault, podium, corner and bottom of the tunnel. This study prove that, the podium that is close to the blasting source has been recognized as the most risky section of the tunnel that may be subjected to the largest blasting impact. However, this risk could be controlled by the reducing the amount of blasting power.%在水平层状岩体中进行爆破施工,临近隧道不可避免地受到爆破振动的影响.文中通过一种新的计算模型DLSM (Distinct Lattice Spring Model),以吉怀高速大林隧道为研究背景,进行数值模拟,分析层状岩体中临近隧道的爆破振动响应.DLSM真实地再现了应力波传递、反射、折射、叠加和耗散过程;重点监测了隧道的拱顶、腰墙、墙角和底部的动力响应特征.研究发现,临近隧道靠近爆破源一侧的腰墙受到的应力波冲击最大,但是控制好爆破装药量,即可满足规范的要求.