爆破对不同龄期混凝土喷层破坏的数值分析

Numerical Analysis of Blasting on the Rupture of Concrete Spray Layer at Different Ages

以中国安徽某煤矿轨道大巷在掘进爆破施工过程中发生混凝土喷层崩落的事故为研究背景,利用ANSYS/LS-DYNA3D大型有限元模拟软件分析了应力波在不同龄期混凝土喷层的传播及其发生破坏的过程,给出了不同龄期内距掘进面的安全距离和研究了质点振动速度对混凝土喷层的影响,并进一步对混凝土喷层稳定性进行了分析,同时将数值计算得到的质点振动速度峰值与经验公式进行比较分析得出数值计算结果与经验公式基本吻合,数值模拟在研究爆破振动对不同龄期混凝土喷层的破坏是可行的,对巷道围岩加固具有一定的参考价值。

By taking an accident of the rupture of concrete spray layer induced by blasting as the background,which occurred in the process of excavating for main track roadway of a coal mine in China＇s Anhui province,the explosive stress wave and its propagation in concrete spray layer at different ages as well as its rupture process are analyzed by using the large-scale finite-element method software of ANSYS/LS-DYNA.The safe distance from the excavation face is obtained and the influence of the velocity on the concrete spray layer and the stability of concrete spray layer are studied.The peak velocity of numerical calculation and that calculated by the empirical formula basically coincide;therefore,using numerical simulation to study the rupture of concrete spray layer at different ages is applicable,and this can provide references to the reinforcement of the surrounding rock of the roadway.