摘要
利用非线性软件LS-DYNA和后处理软件LS-PREPOST,数值模拟无限水域水下爆炸冲击波的传播过程、岩石的破坏损伤过程,并采用LS-DYNA中的隐式-显式求解方法探究水下爆炸荷载下围压对岩石内裂纹扩展的影响。结果表明岩石主要受到拉伸破坏和剪切破坏;裂纹主要分布于岩石上、下表面角部区域,岩石侧面边缘区域;初始三向围压都会抑制与其方向垂直平面内的裂纹扩展;与爆破荷载同向的初始应力增大会使裂纹扩展范围减小,水平初始应力的增大会使角部区域裂纹与岩石侧面边缘区域裂纹相连通,水平面内的裂纹扩展范围更大,甚至在岩石内部产生新裂纹;不同于陆地钻孔爆破,围压的增大可能使得裂纹密度也增大。
Rock crack propagation under underwater explosion loading is of great significance for explosive fracturing.In this study,the propagation process of shock wave generated by underwater explosions in infinite water and the failure process of rock were numerically simulated using the LS-DYNA and LS-PREPOST software.The implicit-explicit solution method of the LS-DYNA was used to analyze the influence of confining pressure on the crack propagation in rock under underwater explosion loading.The results show that the rock is mainly subject to tensile failure and shear failure,and cracks are mainly distributed in the corner of the upper and lower surface of the rock,and in the edge of the rock side surface.The initial confining pressure in each direction can inhibit the crack propagation in the plane perpendicular to the pressure direction.The increase of the initial stress in the same direction as the blasting load can reduce the crack propagation,and moreover,with the increase of the initial horizontal stress,the cracks in the corner can connect with the cracks in the edge of the rock side surface,and the range of crack propagation in the horizontal plane is large,even new cracks can be generated in the rock.Different from the drilling and blasting on land surface,the increase of confining pressure of underwater explosion loading can increase the crack density.
作者
余庆
张辉
蔡志翔
YU Qing;ZHANG Hui;CAI Zhixiang(College of Petroleum Engineering, China University of Petroleum(Beijing), Beijing 102249, China)
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第3期96-104,共9页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家自然科学基金项目(52174010,U19B6003)
中国石油天然气集团有限公司-中国石油大学(北京)战略合作科技专项(ZLZX2020-01)。
关键词
水下爆炸
冲击波
围压
裂纹扩展
数值模拟
underwater explosion
shock wave
confining pressure
crack propagation
numerical simulation
