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探讨了JWL爆源模型与朗道模型、应变强度分布模型与应变软化模型的异同点,并在CDEM源程序中引入了JWL爆源模型及应变强度分布模型。利用改进的CDEM程序研究了爆炸载荷作用下岩石损伤破裂的物理过程,重点分析了压碎区、破损区比半径及总破裂度随岩石应变强度的变化规律。研究发现:①最大应变强度是控制岩石破裂范围的关键量,最大应变强度从0.5%增加至5%,压碎区比半径从37降至4,破损区比半径从45降至12,岩石总破裂度从55%降至5%;②相同应变强度情况下,岩石更容易发生剪切破坏,剪切破坏产生的破坏区域的比半径较拉伸破坏产生的大2~5,总破裂度大3%左右;③拉伸破坏为主导(拉伸应变强度主控),破损区的裂缝将沿着径向平直发展;剪切破坏为主导(剪切应变强度主控),破损区的裂缝将弧状向外扩展。
The similarities and differences between JWL explosion source model and Landau model, strain intensity distribution model and strain softening model are discussed. JWL model and strain intensity distribution model are introduced in CDEM source code. The improved CDEM program was used to study the physical process of rock damage and rupture under explosive load. The variation rules of the specific radii and total rupture with the rock strain strength were analyzed emphatically. The results show that: ①The maximum strain strength is the key to control the rock fracture range. The maximum strain strength increases from 0.5% to 5%, the crushing zone ratio decreases from 37 to 4, and the damage area decreases from 45 to 12, The rupture degree is reduced from 55% to 5%; ② Under the same strain strength, the rock is more prone to shear failure, the specific radius of the damaged area caused by shear failure is 2 ~ 5 times larger than the tensile failure, 3%; ③ Tensile damage is dominant (tensile strength control), cracks in the damaged area will develop along the radial direction straightly; shear failure is dominant (shear strength control), cracks in the damaged area Extend the arc outward.