王云飞, 董贺, 马勇超,等.含平行双裂隙白砂岩力学行为数值分析[J].河南理工大学学报（自然科学版）,doi:10.16186/j.cnki.1673-9787.2023030010

WANG Y F, DONG H, MA Y C,et al.Numerical analysis of mechanical behavior of sandstone with parallel doublefissure[J].Journal of Henan Polytechnic University(Natural Science) ,doi:10.16186/j.cnki.1673-9787.2023030010

含平行双裂隙白砂岩力学行为数值分析(网络首发)

王云飞, 董贺, 马勇超, 张意文, 袁乐乐

河南理工大学 土木工程学院，河南 焦作 454000

摘要:为探究平行双裂隙对白砂岩力学特性、裂纹扩展以及能量演化的影响，利用颗粒流软件 PFC2D 获取白砂岩细观力学参数，通过改变双裂隙倾角和双裂隙间距两个关键影响因素，进行多次单轴压缩试验并对模拟结果进行分析。获得以下主要结论：随着裂隙倾角的增大，岩石的峰值强度、弹性模量也随之变大；随着平行双裂隙间距的增大，在裂隙倾角为30°的情况下，岩石的峰值强度和弹性模量大幅降低，在倾角为60°的情况下，裂隙间距对岩石的峰值强度和弹性模量无显著影响，即裂隙间距转变为影响力学特性的次要因素；预制裂隙倾角对岩石的微裂纹发育过程有着重要影响，在裂纹扩展初期以拉伸裂纹为主，最终破坏形式多为剪切破坏，预制裂隙倾角为45°时，裂纹发育至贯通最为彻底；随着倾角的增大，耗散能开始出现的应变节点逐渐后移，岩石的弹性储能极限随之增强，其中在0°~15°区间，储能极限发生了一次小幅度反弹。

关键词:平行双裂隙;离散元;声发射;裂纹扩展

中图分类号：TU45

doi:10.16186/j.cnki.1673-9787.2023030010

基金项目:国家自然科学基金资助项目（U1604142）；河南省重点研发与推广专项项目（212102310405）

收稿日期:2023-03-06

修回日期:2023-05-06

网络首发日期: 2023-11-30

Numerical analysis of mechanical behavior of sandstone with parallel doublefissure（Online）

WANG Yunfei, DONG He, MA Yongchao, ZHANG Yiwen, YUAN Lele

School of Civil Engineering， Henan Polytechnic University， Jiaozuo 454000， Henan， China

Abstract:In order to explore the influence of parallel double fractures on the mechanical properties， crack propagation and energy evolution of sandstone， the particle flow software PFC2D was used to obtain the mesoscopic mechanical parameters of sandstone， and by changing the two key influencing factors of double fracture inclination and double fracture spacing， multiple uniaxial compression tests were carried out and the simulation results were analyzed. The following main conclusions are obtained： with the increase of the inclination of the fissure， the peak strength and modulus of elasticity of the rock also become larger； With the increase of parallel double fracture spacing， the peak strength and elastic modulus of the rock are greatly reduced at a fissure inclination of 30°， and the fissure spacing has no significant effect on the peak strength and elastic modulus of the rock at an. inclination of 60°， that is， the fissure spacing is transformed into a secondary factor of the influencing characteristics； The inclination of the prefabricated fracture has an important impact on the micro-crack development process of the rock， and the tensile crack is the main in the early stage of crack expansion， and the final destruction form is mostly shear failure， and when the inclination angle of the prefabricated fracture is 45°， the crack develops to the most thorough penetration； With the increase of inclination， the strain node where the dissipative energy begins to appear gradually moves backward， and the elastic energy storage limit of the rock is enhanced， in which the energy storage limit has a small rebound in the range of 0° to 15°.

Key words:parallel double-fissure;discrete elements;acoustic emission;crack propagation

CLC：TU45