Directional rupture is one of the most important and most common problems related to rock breaking. The goal of directional rock breaking can be effectively achieved via multi-hole linear co-directional hydraulic fracturing. In this paper, the XSite software was utilized to verify the experimental results of multi-hole linear co-directional hydraulic fracturing., and its basic law is studied. The results indicate that the process of multi-hole linear co-directional hydraulic fracturing can be divided into four stages: water injection boost, hydraulic fracture initiation, and the unstable and stable propagation of hydraulic fracture. The stable expansion stage lasts longer and produces more microcracks than the unstable expansion stage. Due to the existence of the borehole-sealing device, the three-dimensional hydraulic fracture first initiates and expands along the axial direction in the bare borehole section, then extends along the axial direction in the non-bare hole section and finally expands along the axial direction in the rock mass without the borehole. The network formed by hydraulic fracture in rock is not a pure plane, but rather a curved spatial surface. The curved spatial surface passes through both the centre of the borehole and the axial direction relative to the borehole. Due to the boundary effect, the curved spatial surface goes toward the plane in which the maximum principal stress occurs. The local ground stress field is changed due to the initiation and propagation of hydraulic fractures. The propagation direction of the fractures between the fracturing boreholes will be deflected. A fracture propagation pressure that is greater than the minimum principle stress and a tension field that is induced in the leading edge of the fracture end, will aid to fracture intersection; as a result, the possibility of connecting the boreholes will increase.

定向破裂是与岩石破碎有关的最重要和最普遍的问题之一。通过多孔线性同向水力压裂可以有效地实现定向岩石破碎的目的。本文利用XSite软件验证了多孔线性同向水力压裂的实验结果，并研究了其基本规律。结果表明，多孔线性同向水力压裂过程可分为注水推进，水力压裂起始，水力压裂不稳定不稳定扩展四个阶段。稳定的膨胀阶段比不稳定的膨胀阶段持续更长的时间并产生更多的微裂纹。由于存在钻孔密封装置，三维水力压裂首先在裸眼井段中沿轴向开始扩展，然后在非裸眼井段中沿轴向扩展，最后在没有井眼的岩体中沿轴向扩展。由岩石中的水力压裂形成的网络不是纯平面，而是弯曲的空间表面。弯曲的空间表面穿过钻孔的中心和相对于钻孔的轴向方向。由于边界效应，弯曲的空间表面朝向发生最大主应力的平面。局部地面应力场由于水力压裂的产生和传播而改变。压裂孔之间的裂缝的传播方向将被偏转。大于最小主应力的裂缝传播压力和在裂缝末端的前缘产生的张力场将有助于裂缝的交叉。结果，增加了连接井眼的可能性。