应力及含水状态对裂隙花岗岩蠕变特性的影响研究

doi:10.13722/j.cnki.jrme.2023.0562

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摘要为研究应力及含水状态对裂隙花岗岩蠕变特性的影响，以我国高放废物地质处置甘肃北山预选区完整花岗岩及含不同倾角裂隙的花岗岩为研究对象，采用岩石高温三轴流变试验系统，开展不同围压条件下的应力多级加载蠕变试验和不同含水状态下的单轴蠕变试验。试验结果表明，裂隙花岗岩横向变形的蠕变特征更加显著，且横向稳态蠕变率略高于轴向稳态蠕变率。随着应力水平的提高，轴向应变呈现出线性增长关系，而横向应变、轴向及横向稳态蠕变率均呈现出指数函数增长关系。在围压一致且偏应力相同的条件下，裂隙倾角越大，轴向和横向应变越大，轴向和横向稳态蠕变率也越高。饱和状态下，花岗岩的稳态蠕变率显著提高，岩体受力更容易发生变形，导致花岗岩在更低的蠕变荷载或更短的蠕变历时下即发生破坏。当裂隙倾角为45°或60°时，饱和试样的破坏时间仅为干燥试样的1.05‰或0.84‰。倾角30°，45°和60°裂隙花岗岩的蠕变破坏形式分别为穿裂隙面破坏、穿裂隙面破坏和沿裂隙面滑移并存的复合破坏以及沿裂隙面的滑移破坏，10 MPa围压及干燥、饱和状态均不会对其破坏形式产生显著影响。

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	王春萍1
	2
	廖益林3
	刘建锋3
	刘健1
	2
	赵星光1
	2
	陈亮1
	2
	王璐3
	4

关键词 ：岩石力学, 花岗岩, 蠕变, 裂隙倾角, 含水条件, 破坏形式

Abstract：To investigate the effects of stress and water content on the creep characteristics of fractured granite，a series of creep tests were carried out using the high temperature triaxial rheological test system for rock. The experiment mainly consists of the multi-stress creep tests under different confining pressures，and uniaxial creep tests under different water content. The test samples were intact granite and granite with different inclinational fractures，which were taken from Beishan pre-selected area of Gansu Province for geological disposal of high-level radioactive waste in China. The experimental results indicates that, the lateral deformation of fractured granite presents more significant creep characteristics，and the lateral steady creep strain rate is slightly higher than axial steady creep strain rate. With the increase of the stress level，the axial strain presents a linear growth relationship，while the lateral strain and the axial and lateral steady creep strain rates all show an exponential function growth relationship. Under the condition of the same confining pressure and the same deviatoric stress，the larger the fracture inclination angle is，the larger the axial and lateral strains are，and the higher the axial and lateral steady creep rates are. Under saturated state，the steady creep rate of granite is significantly increased，and the rock mass is more prone to deformation under the same stress，resulting in the failure of granite under lower creep load or shorter creep duration. When the inclination angle θ is 45° or 60°，the failure time of saturated sample is only 1.05‰ or 0.84‰ of the failure time of dry sample. The failure modes of fractured granite can be divided into three types：causing new fractures which cut across the pre-made fracture(θ = 30°)，slipping of the pre-made fracture(θ = 60°) and the compound failure of the first two forms(θ = 45°). The confining pressure of 10 MPa，and the dry or saturated state have no significant influence on the creep failure form of fractured granite.

Key words： rock mechanics granite creep fracture inclination angle water content failure mode

引用本文:

王春萍1，2，廖益林3，刘建锋3，刘健1，2，赵星光1，2，陈亮1，2，王璐3，4. 应力及含水状态对裂隙花岗岩蠕变特性的影响研究[J]. 岩石力学与工程学报, 2024, 43(4): 907-917.
WANG Chunping1，2，LIAO Yilin3，LIU Jianfeng3，LIU Jian1，2，ZHAO Xingguang1，2，CHEN Liang1，2，WANG Lu3，4. Study on the influence of stress and water content on creep characteristics of fractured granite. , 2024, 43(4): 907-917.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0562 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I4/907

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