【摘要】 为研究三维内裂纹在水-力耦合下的裂纹扩展规律,利用著名断裂力学计算软件Franc3d对双轴条件下含内裂纹标准立方体试件水力压裂进行数值模拟,得到了裂纹的扩展过程以及裂纹尖端的应力强度因子的分布。计算结果表明:①利用三维断裂有限元计算软件Franc3d对水-力耦合下的裂纹扩展过程进行了数值模拟,可见Franc3d软件在模拟水-力耦合下的裂纹扩展问题上具有很大的优越性;②裂纹扩展沿着预制裂纹尖端进行萌生,沿着最大主应力方向进行扩展,最终裂纹与最大主应力方向呈现一定的夹角;③对裂纹尖端的应力强度因子进行了计算,可以发现水-力耦合下的内裂纹扩展为Ⅰ-Ⅱ-Ⅲ型复合。更多还原

【Abstract】 In order to study the crack propagation law of three-dimensional internal crack under water-force coupling,the hydraulic fracturing of standard cube specimen with internal crack under biaxial condition was numerically simulated by using the famous fracture mechanics calculation software Franc3 d. The crack propagation process and the distribution of stress intensity factor at the crack tip are obtained. The results show that: ①the crack propagation process under the coupling of water and force is numerically simulated by using the three-dimensional fracture finite element software Franc3 d. It can be seen that the Franc3 d software has great superiority in simulating the crack propagation problem under hydro-mechanical coupling. ②crack propagation along the The crack tip is initiated and propagated along the direction of the maximum principal stress,and the crack and the maximum principal stress direction show a certain angle. ③the stress intensity factor at the crack tip is calculated. It can be found that the internal crack propagates to Ⅰ-Ⅱ-Ⅲ type composite under the water-force coupling.更多还原