裂隙注浆砂岩冲击破坏及能量耗散机制  

The impact failure and energy dissipation mechanism of grouted sandstone in fractures

作　　者：杨文轩 王磊[1] 马飞飞 王远鹏 陈世官 YANG Wen-xuan;WANG Lei;MA Fei-fei;WANG Yuan-peng;CHEN Shi-guan(Xi'an University of Science and Technology,Xi'an 710054,China;Department of Architecture and Engineering,Shandong Water Conservancy Vocational College,Rizhao 276826,Shandong,China)

机构地区：[1]西安科技大学建筑与土木工程学院,西安710054 [2]山东水利职业学院建筑工程系,山东日照276826

出　　处：《工程爆破》2025年第1期34-41,共8页Engineering Blasting

基　　金：国家自然科学基金资助项目(12172280)。

摘　　要：为研究裂隙注浆砂岩冲击破坏及能量耗散机制,利用φ50 mm分离式霍普金森压杆(SHPB)对不同裂隙倾角注浆裂隙砂岩开展单轴冲击试验,选取典型角度(75°)开展不同应变率单轴冲击试验,分析试验中试件的动态力学特性及破坏形态,依据能量耗散规律,揭示其破坏机制。结果表明:不同加载角度与加载率条件下,砂岩试件应力-应变曲线均具有“三阶段”变化趋势,都存在由弹性受压阶段发展至失稳阶段的变化趋势;砂岩试件的动态压缩强度随裂隙倾角的增大呈现出先减后增的趋势,45°时出现强度拐点,同时砂岩试件具有明显的应变率效应,其动态抗压强度随应变率的增加而增加,动态抗压强度的极差为16.2 MPa。能量耗散方面,砂岩试件的能量耗散存在明显的应变率效应,随着应变率的增加,试件的各种能耗均有不同程度的增加。对比试件的动能变化,入射能的增加使得更多的能量用于试件动能耗散,导致试件破坏形态更加破碎,产生更多的碎屑;相同应变率,不同角度下试件透射能占比很小,结构面对应力波的衰减效果明显。To study the impact failure and energy dissipation mechanism of fractured grouting sandstone,the φ50 mm Split Hopkinson Pressure Bar(SHPB)was used to conduct uniaxial impact tests on grouted sandstone with different fracture angles.A typical angle(75°)was selected to conduct uniaxial impact tests with different strain rates.The dynamic mechanical properties and failure modes of the specimens were analyzed,and their failure mechanisms were revealed based on energy dissipation laws.The results show that under different loading angles and loading rates,the stress-strain curve of sandstone specimens exhibits a"three stage"trend,with a trend of development from the elastic compression stage to the instability stage;The dynamic compressive strength of sandstone specimens shows a trend of first decreasing and then increasing with the increase of crack inclination angle,with a strength turning point at 60°.At the same time,sandstone specimens have a significant strain rate effect,and their dynamic compressive strength increases with the increase of strain rate.The range of dynamic compressive strength is 16.2 MPa.In terms of energy dissipation,there is a significant strain rate effect in the energy dissipation of sandstone specimens.As the strain rate increases,various energy consumption of the specimens increase to varying degrees.Compared to the changes in kinetic energy of the specimen,the increase in incident energy causes more energy to be used for the dissipation of kinetic energy,resulting in a more fragmented failure mode of the specimen and the generation of more debris;At the same strain rate and different angles,the proportion of transmitted energy in the specimen is very small,and the attenuation effect of stress waves on the structural surface is significant.

关 键 词：裂隙砂岩 冲击破坏 动力学特性 能量耗散 

分 类 号：TU458[建筑科学—岩土工程] TD235[建筑科学—土工工程]