地下工程抗爆的孔洞群防护技术

Cavity-group Protection Technique for of Underground Engineering Explosion-resistance

提出了用于地下工程抗爆炸地冲击的孔洞群防护技术。分析了孔洞群防护技术的基本原理,包括应力波反射原理、应力波导流原理、介质层弱化原理、应力波会聚原理和动应力集中原理。给出了几种孔洞群防护技术方案,包括孔洞群保护伞、孔洞群分配层、应力波导流洞和带孔锚固结构。进行了原理性的二维数值模拟分析,进一步验证了孔洞群防护技术的有效性。数值算例表明无孔洞群防护洞室顶部爆炸压力波荷载峰值要明显高于有孔洞群防护洞室顶部爆炸压力波荷载峰值,说明孔洞群确实降低了洞室结构上的荷载,起到了保护洞室结构的作用。

The cavity-group protection technique of underground engineering explosion resistance is presented. The basic principle of cavity-group protection technique is analyzed, including stress wave reflection principle, stress wave diversion principle, medium layer weakening principle, stress wave convergence principle and dynamic stress concentration principle. Several cavity-group protection technique schemes are provided, including cavity-group protection umbrella, cavity-group distribution layer, stress wave diversion hole and anchor structure with holes. With a basic two dimensional numerical simulation, the validity of cavity-group protection technique is validated further. A numerical example show that the cavity-group reduces the over-pressure on the top of the cavity structure remarkable, have the function of protecting the cavity. Some problems in the cavity-group protection technique study is pointed out. This paper has important value for the protective study of underground engineering.