爆炸载荷对水泥试样损伤破坏规律研究

Research of cement samples damage and fracture by exploding load

从实验和数值模拟两方面对爆炸载荷对水泥试样的损伤破坏进行了研究。首先,在水中利用爆炸产生的爆炸冲击波对水泥试样进行损伤破坏,模拟“层内爆炸”采油技术中激波使岩石损伤开裂的现象;然后,利用波动力学理论,对激波在实验条件下对水泥试样的损伤破坏进行了数值模拟。结果表明,在冲击载荷作用下,水泥试样的损伤破坏可分为压实破坏、压实损伤、拉伸损伤、拉伸破坏4个区域,在压实损伤区水泥试样也具有较好的渗透性。数值模拟可以用来确定各种裂纹形成的应力条件,并可通过预制剖面上的裂纹分布来预测水泥试样内部裂纹分布的基本规律。

The cement sample＇s damage and fracture by exploding load was studied by experiment and numerical simulation method. First, the phenomenon of the rock damage and fracture by shock wave of exploding in fractures was simulated through the experiment of exploding on the surface of the cement sample in deep water. Second, the damage and fracture mechanism was numerically simulated by wave mechanics under the experimental condition. The results show that there exist four damage zones on the sample, which are compacted fracture zone, compacted damage zone, tensile damage zone and tensile fracture zone. And the cement sample has good permeability in compacted damage zone. And the stress conditions of all kinds fractures forming can be determined by numerical simulation. The basic distribution law of inner fracture of the cement sample can be predicted by fractures distribution on prefab section.