锚固条件下煤系地层裂隙岩体蠕变力学特性研究  

Creep mechanical characteristics of fractured rock mass in coal measure strata under anchoring conditions

作　　者：李天国 唐彬[1,2] 程桦[1] 刘小虎[1] 侯俊领 李宏亮 王晓云 LI Tian-guo;TANG Bin;CHENG Hua;LIU Xiao-hu;HOU Jun-ling;LI Hong-liang;WANG Xiao-yun(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan,Anhui 232001,China;State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan,Anhui 232001,China;Vanadium and Titanium College,Panzhihua College,Panzhihua,Sichuan 617000,China;Huainan Mining Industry(Group)Co.,Ltd.,Huainan,Anhui 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001 [3]攀枝花学院钒钛学院,四川攀枝花617000 [4]淮南矿业(集团)有限责任公司,安徽淮南232001

出　　处：《岩土力学》2024年第10期3003-3012,共10页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.51804006);安徽省自然科学基金面上项目(No.2208085ME118)。

摘　　要：为探究煤系地层裂隙岩体锚固状态下的蠕变特性,开展不同裂隙倾角(15°、30°、45°、60°、90°)下裂隙加锚试件、裂隙无锚试件、完整试件的单轴蠕变试验。试验结果表明:相同应力加载等级时,裂隙无锚试件的瞬时应变量大于完整试件的瞬时应变量,而裂隙加锚试件与完整试件的瞬时应变量之差随着裂隙倾角的增加逐渐减小;随着应力加载等级的增加,各岩石试件的稳态蠕变量也逐级增大;含裂隙试件的稳态蠕变速率随着裂隙倾角增大呈先下降再上升的趋势,但裂隙加锚试件的稳态蠕变速率小于相同应力等级下裂隙无锚试件的稳态蠕变速率;在裂隙倾角较低时,裂隙无锚试件和裂隙加锚试件的裂纹贯通发展规律差异较大;基于CVISC蠕变模型进行参数反演,得出Maxwell和Kelvin相关系数随应力加载等级的变化趋势;采用应力-应变等时曲线法和非稳定流变判别法研究裂隙试件的长期强度变化规律。该研究结果为煤矿巷道长期稳定性分析及锚杆支护方案提供了试验依据。To investigate the creep characteristics of fractured rock mass in coal measure strata under anchorage,uniaxial creep tests were carried out on anchored,unanchored fractured and intact specimens at different fracture dip angles(15°,30°,45°,60°,90°).The results show that the instantaneous strain of the unanchored fractured specimens is greater than that of the intact specimens under the same stress loading level.The difference between the anchored fractured specimens and the intact specimens gradually decreases as fracture inclination increases.With the increase of stress loading level,the steady-state creep variable of each rock specimen also increases.The steady-state creep rate of fractured specimens initially decreases and then increases with the increase of fracture dip angle.However,the steady-state creep rate of anchored fractured specimens is lower than that of unanchored fractured specimens under the same stress level.Significant differences in crack penetration development exist between unanchored and anchored fractured specimens at low fracture dip angle.Based on the CVISC creep model,parameter inversion was performed,and the trends of Maxwell and Kelvin correlation coefficients with stress loading level were obtained.The stress-strain isochronous curve method and the unsteady rheological discriminant method were employed to study the long-term strength variation of fractured specimens.The research results provide an experimental basis for long-term stability analysis and bolt support schemes of coal mine roadway.

关 键 词：煤矿 裂隙 锚杆 蠕变 长期强度 CVISC蠕变模型 

分 类 号：TU457[建筑科学—岩土工程]