循环冲击荷载下含裂隙岩石能量耗散与损伤特性  

Energy Dissipation and Damage Characteristics of Fractured Rock under Cyclic Impact Loads

作　　者：张杰 孙杨 洪伟 李守奎 ZHANG Jie;SUN Yang;HONG Wei;LI Shoukui(China ENFI Engineering Corporation,Beijing 100038,China;Key Laboratory of Ground Control Management Plan in Deep Metal Mine National Mine Safety Administration,Beijing 100038,China)

机构地区：[1]中国恩菲工程技术有限公司,北京100038 [2]深部金属矿采动地压灾害防控国家矿山安全监察局重点实验室,北京100038

出　　处：《金属矿山》2025年第2期41-47,共7页Metal Mine

基　　金：国家重点研发计划项目(编号:2023YFC2907201)。

摘　　要：为探究裂隙岩石在循环冲击荷载下的能量耗散与损伤特性,采用水刀切割技术预制不同倾角裂隙的花岗岩试样,利用分离式SHPB试验装置开展循环冲击试验。在循环冲击过程中,采用核磁共振设备进行孔隙度及T_(2)图谱测定,从细观结构层面揭示岩样的损伤演化过程;结合能量耗散与损伤变量的理论计算,定量分析含裂隙岩石的损伤破坏特征。研究发现:裂隙岩石在循环冲击过程中,其累积损伤增长速率逐渐增大,变化曲线呈下凹型,岩样破坏时损伤增量显著增大;岩样耗散能占比和能时密度均随裂隙倾角的增大呈“倒U型”变化趋势,与累积损伤值随裂隙倾角变化趋势一致。预制裂隙倾角与应力加载方向为30°~60°的岩石内部孔隙发育较为活跃,裂隙倾角为45°的岩样在相同冲击应力下的裂纹萌生数量较多,抗冲击能力最弱;岩石破裂时,中、大型孔隙发育最为显著。The work aimed at exploring the energy dissipation and damage characteristics of fractured rocks under cyclic impact loads.Firstly,the granite specimens with fractures of different inclination angles were prefabricated by waterjet cutting technology.Then,conducting cyclic impact tests using the separate SHPB test device.In the cyclic impact process,NMR equipment was used to determine the porosity and T_(2) map,revealing the damage evolution process of rock specimens from the mesostructured level.Combined with the theoretical calculation of energy dissipation and damage variables,quantitatively analyzed the evolution law of cumulative damage of fractured rocks.Research has found that the cumulative damage growth rate of fractured rocks gradually increases during the cyclic impact process.With the concave changing curve,the damage increment increased significantly when the rock specimen failed.The proportion of dissipated energy and energy density per unite time of rock specimen showed an'inverted U-shape'trend with the increased inclination angles of the fracture,which was consistent with the cumulative damage value.In the rock where the angle between prefabricated fracture and stress load direction was 30°~60°,the pores were more actively developed,and the specimen with an inclination of 45°has more crack initiation and the weakest impact resistance under the same impact stress.When the rock fractured,the medium and large pores were significantly developed.

关 键 词：循环冲击荷载 裂隙岩体 能量耗散 累积损伤 破坏特征 

分 类 号：TD315[矿业工程—矿井建设]