深埋石英砂岩三轴分级蠕变特性研究  

Investigation on creep property of deep quartz sandstoneunder triaxial multistage loading

作　　者：陈浩哲 邵珠山[1,2,3] 靳冬冬 张喆 孙钰雯[1,3] 朱意明 CHEN Haozhe;SHAO Zhushan;JIN Dongdong;ZHANG Zhe;SUN Yuwen;ZHU Yiming(Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering,Xi'an University of Architecture and Technology,710055 Xi'an,China;School of Civil Engineering,Xi'an University of Architecture and Technology,710055 Xi'an,China;School of Science,Xi'an University of Architecture and Technology,710055 Xi'an,China)

机构地区：[1]西安建筑科技大学陕西省岩土与地下空间工程重点实验室,西安710055 [2]西安建筑科技大学土木工程学院,西安710055 [3]西安建筑科技大学理学院,西安710055

出　　处：《应用力学学报》2025年第2期358-366,共9页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目(No.11872287);陕西省重点研发计划资助项目(No.2019ZDLGY01-10)。

摘　　要：岩爆发生的时间滞后性与深埋隧洞内围岩的蠕变力学特性密切相关,故本研究采用三轴分级加载方式对不同含水状态下深埋石英砂岩进行了蠕变力学试验。试验结果表明:当处于高应力水平时,水对岩石的弱化效果更加明显,围压效应的束缚作用降低了水的弱化程度以减缓岩石的蠕变失效进程且提升了岩石强度。在干燥状态下石英砂岩的体积变形较饱和状态呈现“锯齿”状的波动演化形态。水的弱化作用使体积扩张变形在随时间的演化过程中表现出延性特征,围压效应则抑制了变形程度并压缩了变形调整空间。应力水平与对数蠕变应变率关系随着含水率的增加呈向左移动的趋势,随着围压上升而向右移动。干燥与饱和状态岩石在单轴条件分别呈现出以剪切为主、剪切与劈裂并存的失效模式,围压效应下的干燥试件仍以剪切破坏为主,饱和试件则在剪切与劈裂破坏共存中趋向于剪切破坏。The time delay for rockburst is closely related to the creep mechanical properties of the surrounding rock in deep tunnel.Thus,the creep test for dry and saturated quartz sandstone under triaxial multistage loading was carried out.The results show that at the high stress level,the weakening effect of water on the rock is more obvious,which is faded by the restraint of confining pressure effect to slow down the creep failure process and improve the strength of the rock.In the dry state,the volume deformation of quartz sandstone presents a“sawtooth”wave evolution pattern compared to the saturated state.The weakening effect of water makes the volume expansion and deformation exhibit ductile characteristics in evolution process over time,while the confining pressure suppresses the deformation and compresses the adjustment space.The relationship between stress level and(log-)creep strain rate moves to the left as the water content increases,and moves to the right as the confining pressure increases.The dry and saturated rocks show failure modes in which shear dominates and shear and split coexist under uniaxial conditions,respectively.The dry specimen under confining pressure is still dominated by shear failure,while the saturated specimen tends to shear mode in the coexistence of shear and split failure.It may provide the reference for the generation mechanism,prediction and prevention of time delayed rockburst.

关 键 词：石英砂岩 蠕变 含水状态 围压 时间滞后性 

分 类 号：TU452[建筑科学—岩土工程]