隧道掏槽爆破岩块抛掷堆积形态的数值模拟  

Numerical simulation of accumulation form of rock blocks tunnel during cutting blasting

作　　者：朱礼臣 ZHU Li-chen(Engineering Department of China Railway 14th Bureau Group Construction Engineering Co.,Ltd.,Jinan 250000,China)

机构地区：[1]中铁十四局集团建筑工程有限公司工程部,济南250000

出　　处：《工程爆破》2024年第3期54-61,共8页Engineering Blasting

摘　　要：为了控制隧道掏槽爆破飞石范围,确保隧道爆破施工的高效性与安全性,利用离散元软件对掏槽体岩块抛掷堆积形态进行了数值模拟,结合某快速铁路单线隧道工程,研究了掏槽体岩块抛掷堆积形态及其主要参数。在对比分析掏槽体岩块堆积形态的模拟结果与实际测量结果的基础上,研究发现:掏槽体岩块的初速度为堆积形态的重要影响因素;在初速度为10 m/s的前提下,从爆破开始到岩体全部停止运动总共经历3.5 s,最终堆积形态近似于椭圆形;最大抛掷距离与前端堆积高度均符合工程实际测量结果。研究结果对隧道掏槽爆破设计和安全施工,具有重要的指导意义。In order to control the range of flying rocks in tunnel cutting blasting and ensure the efficiency and safety of tunnel blasting construction,the discrete element software was used to simulate the throwing and accumulation form of rock blocks in cutting body.Combined with a single-line tunnel project of a fast railway,the throwing and accumulation form of rock blocks in cutting body and its main parameters were studied.On the basis of comparing and analyzing the simulation results and actual measurement results of cut rock accumulation form,it is found that the initial velocity of cut rock is an important factor affecting the accumulation form.Under the premise that the initial velocity is 10 m/s,it takes 3.5 s from the beginning of blasting to the complete stop of rock mass,and the final accumulation shape is similar to ellipse.The maximum throwing distance and the front stacking height are in line with the actual measurement results of the project and achieve the purpose of the project.The research results have important guiding significance for the safe construction of tunnel cutting blasting.

关 键 词：隧道掏槽爆破 离散元数值模拟 岩块堆积形态 抛掷初速度 

分 类 号：TD235[矿业工程—矿井建设]