摘要
研究了冲击荷载条件下,裂隙中含不同配比的填充物对裂隙岩体动力学性能的影响。将土与标准砂配成的泥砂浆注入含预制裂隙的砂岩试件中,使用SHPB施加冲击荷载来获取试验数据。通过分析应力应变曲线的变化规律、岩石强度变化及破坏模式与岩石吸能特性变化等发现:填充物强度和黏聚力均对含贯通裂隙岩石的峰值应力有影响;当两种作用共同影响试样时,对试样动态弹性模量有明显提升效果;当填充物中土与砂共同存在时,砂的含量越高,耗散能越低;在一定范围内,填充物中含砂量越低,横向次生裂纹越多,试样最终破坏越严重。
The influence of different filling materials on the dynamic properties of fractured rock mass under the action of impact loading is studied in the paper. In order to analyze the laws of dynamic mechanical properties, the failure mode and the change of energy absorption properties of rock based on the experiment data obtained from the SHPB dynamic loading test, the mixture made of soil and standard sand is injected into the sandstone specimen with pre-existing crack. The conclusions inferred from the research are as follows. The strength and cohesive force of filler affect the peak stress of rock with penetrative cracks. When two kinds of actions affect the specimen together, the dynamic elastic modulus of the sample is significantly improved. When the soil and sand exist together, the higher the sand content is, the lower the dissipation energy is. Within a certain range, the lower the sand content is, the more the transverse secondary cracks are, and the more serious the final damage is.
作者
许刚
陈韶平
司汉清
王述红
Xu Gang;Chen Shaoping;Si Hanqing;Wang Shuhong(School of Resources ＆ Civil Engineering,Northeastern University,Shenyang 110819,Liaoning,China)
出处
《工程与试验》
2018年第3期64-68,共5页
Engineering and Test
基金
大学生创新创业训练计划项目(2017171042)
