A 3D internal open-type flaw inside gypsum rock-like specimens is prepared using a volume-loss method. It has three types of flaw inclinations and four types of flaw strike lengths. Uniaxial compression and acoustic emission monitoring tests show a small range of secondary local failures are initially distributed near the internal flaw. The area of these secondary failures remains stable and does not extend to other positions until the uniaxial compression strength status of specimens is reached. To explain the special test results, which have rarely been seen in previous 2D fractured rock studies, the surrounding rock of the internal open-type fracture is simplified as a rectangular board model with fixed boundary conditions on four sides. Theoretical calculations prove that a Destruction Region (secondary tensile failures) occurs in the central parts of the internal free surface as built from the internal flaw and is surrounded by a circular Anti-destruction Region. (The rock is under triaxial compression, and tensile failure cannot develop.) Once rock in the Anti-destruction Region reaches its triaxial compressive strength, the constraining effects on the secondary tensile failures disappear. These theoretical analysis results are consistent with experimental phenomena and provide an important reference for geotechnical engineering under similar conditions.

使用体积损失法制备石膏岩石样试样内部的3D内部开口型缺陷。它具有三种类型的缺陷倾向和四种类型的缺陷长度。单轴压缩和声发射监测测试表明，少量的次生局部破坏最初分布在内部缺陷附近。这些二次破坏的区域保持稳定，并且直到达到试样的单轴抗压强度状态才扩展到其他位置。为了解释特殊的测试结果（在以前的2D裂隙岩石研究中很少见），内部开放型裂缝的围岩简化为矩形板模型，在四个侧面都具有固定的边界条件。理论计算证明，破坏区（二次拉伸破坏）发生在内部缺陷表面的中心部分，该内部区由内部缺陷构建而成，并被圆形的抗破坏区包围。（岩石处于三轴压缩状态，不会产生拉伸破坏。）一旦抗破坏区域的岩石达到其三轴压缩强度，对二次拉伸破坏的约束作用就会消失。这些理论分析结果与实验现象相吻合，为相似条件下的岩土工程提供了重要参考。一旦抗破坏区的岩石达到其三轴抗压强度，对二次拉伸破坏的约束作用就消失了。这些理论分析结果与实验现象相吻合，为相似条件下的岩土工程提供了重要参考。一旦抗破坏区的岩石达到其三轴抗压强度，对二次拉伸破坏的约束作用就消失了。这些理论分析结果与实验现象相吻合，为相似条件下的岩土工程提供了重要参考。