砂土中直埋穿管光缆爆炸破坏效应研究

研究直埋穿管光缆的爆炸毁伤机理和易损性，针对直径60 mm钢管内穿GYTA33型铠装光缆，设计并开展了55 kg柱状TNT裸药砂土中近距离爆炸破坏原型试验. 试验结果表明，比例爆距为0.316 m/kg时，该型穿管光缆在钢管出现明显弯曲及压缩变形时通信功能完好，比例爆距0.263 m/kg时通信出现中断，该型穿管光缆在砂土中的临界破坏比例爆距在0.263～0.316 m/kg之间；围绕试验结果开展了数值计算，分析了穿管光缆破坏过程机理. 研究表明，近距离爆炸荷载下，钢管会发生局部弯曲和径向压缩变形，钢管变形初期产生严重压缩变形破坏时对管内光缆的高速冲压作用是其破坏的主要原因. 

Research on Explosion Damage Effect of Directly Buried Through Pipe Optical Cable in Sand

The explosion damage mechanism and vulnerability of the directly buried through pipe optical cable were studied. A prototype test of short-distance explosive failure of 55 kg columnar TNT bare powder sand was designed and carried out for a 60 mm diameter steel pipe penetrating GYTA33 optical cable. Test results show that when the proportional explosion distance was 0.316 m/kg, the communication function of the cable was good; when the steel pipe was obviously bending and was deformed by compression, the communication was interrupted when the proportional explosion distance was 0.263 m/kg. The critical failure proportional explosion distance of the cable in sand was between 0.263 m/kg and 0.316 m/kg. The corresponding numerical simulation calculation was carried out to analyze the failure mechanism of the through pipe cable. The results show that the local bending and radial compression deformation of the steel casing will occur under the near blast load, and the failure of the optical cable is mainly caused by the high-speed stamping of the steel casing in the initial stage of severe compression deformation.