干湿循环对红砂岩力学特性及损伤影响试验研究
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摘要
为了研究干湿循环对红砂岩煤矿井壁和巷道的力学特性及损伤劣化,将红砂岩进行不同次数的干湿循环,然后在MTS815岩石力学试验机上进行压缩试验,研究表明:红砂岩干湿循环次数增加,结构由致密连续向多孔疏松转变,微裂隙压密阶段持续时间增长,塑性屈服明显,峰值应变增加,弹性模量降低,峰值强度大幅下降,但强度不会一直降低,而是趋于某一值;单轴压缩下干湿循环10次时,塑性变形特征明显;随着围压的増大,压密阶段持续时间减小,峰值应变降低,弹性模量增大,峰值强度得到较大提高,峰后塑性变形显著,残余强度随之増强。基于热力学定律和能量耗散原理建立的不同干湿循环次数下红砂岩损伤演化方程和试验结果相近,研究结果可为井壁、巷道设计和支护提供参数。
In order to study the mechanical properties and damage deterioration of the red sandstone coal mine shaft and roadway during thewetting-drying cycles,the red sandstone was subjected to different cycles of wetting-drying cycles,and then compression tests were performed on the MTS815 rock mechanics tester. The study showed that the red sandstone wetting-drying cycles with increasing number of times,the structure changes from dense to porous,the microfissure compaction stage increases in duration,the plastic yields significantly,the peak strain increases,the elastic modulus decreases,and the peak strength decreases significantly,but the strength does not decrease all the time but tends to added to a certain value; under uniaxial compression ten cycles of wetting-drying cycles,the plastic deformation characteristics are obvious; with the confining pressure increases,the duration of the compaction phase decreases,the peak strain decreases,the elastic modulus increases,the peak intensity gets larger as a result,the post-peak plastic deformation is significant and the residual strength is reluctantly increased.Based on the laws of thermodynamics and the principle of energy dissipation,the damage evolution equations and experimental results of red sandstone under different cycles of wetting-drying cycles are similar. The research results can provide parameters for well wall and roadway design and support.
In order to study the mechanical properties and damage deterioration of the red sandstone coal mine shaft and roadway during thewetting-drying cycles,the red sandstone was subjected to different cycles of wetting-drying cycles,and then compression tests were performed on the MTS815 rock mechanics tester. The study showed that the red sandstone wetting-drying cycles with increasing number of times,the structure changes from dense to porous,the microfissure compaction stage increases in duration,the plastic yields significantly,the peak strain increases,the elastic modulus decreases,and the peak strength decreases significantly,but the strength does not decrease all the time but tends to added to a certain value; under uniaxial compression ten cycles of wetting-drying cycles,the plastic deformation characteristics are obvious; with the confining pressure increases,the duration of the compaction phase decreases,the peak strain decreases,the elastic modulus increases,the peak intensity gets larger as a result,the post-peak plastic deformation is significant and the residual strength is reluctantly increased.Based on the laws of thermodynamics and the principle of energy dissipation,the damage evolution equations and experimental results of red sandstone under different cycles of wetting-drying cycles are similar. The research results can provide parameters for well wall and roadway design and support.
引文
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[11]曾胜,李振存,陈涵杰,等.干湿循环下红砂岩强度衰减规律及工程应用[J].长沙理工大学学报:自然科学版,2011,8(4):18-23.ZENG Sheng,LI Zhencun,CHEN Hanjie,et al.Strength attenuation law and engineering application of red sand-stone with the action of dry-wet cycle[J].Journal of Changsha University of Science and Technology:natural science,2011,8(4):18-23.
[12]周顺林,尹帅,王凤琴,等.应力对泥页岩储层脆性影响的试验分析及应用[J].石油钻探技术,2017,45(3):113-120.ZHOU Shunlin,YIN Shuai,WANG Fengqin,et al.Experimental analysis of the effect of stress on shale reservoir brittleness and its application[J].Petroleum Drilling Techniques,2017,45(3):113-120.
[13]袁华玉,程远方,王伟,等.长水平段钻井泥岩井壁坍塌周期分析[J].科学技术与工程,2017,17(3):183-189.YUAN Huayu,CHENG Yuanfang,WANG Wei,et al.Analysis on time-dependent wellbore collapse for long horizontal well in shale formation[J].Science Technology and Engineering,2017,17(3):183-189.
[14]甘文宁.红砂岩工程特性的试验研究及应用[D].合肥:合肥工业大学,2014.
[15]宋朝阳.砂岩细观结构特征与变形破坏机理研究及应用[D].北京:北京科技大学,2017.
[16]姚华彦,朱大勇,周玉新,等.干湿交替作用后砂岩破裂过程实时观测与分析[J].岩土力学,2013,34(2):329-336.YAO Huayan,ZHU Dayong,ZHOU Yuxin,et al.Real-time observation and analysis of fracturing process of sandstone under cyclic drying and wetting[J].Rock and Soil Mechanics,2013,34(2):329-336.
[17]李克钢,郑东普,黄维辉,等.干湿循环作用下砂岩力学特性及其本构模型的神经网络模拟[J].岩土力学,2013,34(S2):168-173.LI Kegang,ZHENG Dongpu,HUANG Weihui,et al.Mechanical behavior of sandstone and its neural network simulation of constitutive model considering cyclic drying-wetting effect[J].Rock and Soil Mechanics,2013,34(S2):168-173.
[18]李克钢,吴勇,郑东普,等.砂岩力学特性对干湿循环效应响应规律的试验研究[J].北京理工大学学报,2013,33(10):1010-1014.LI Kegang,WU Yong,ZHENG Dongpu,et al.Mechanical properties response of sandstone to cyclic drying-wetting effect[J].Transactions of Beijing Institute of Technology,2013,33(10):1010-1014.
[19]谢和平,鞠杨,黎立云,等.岩体变形破坏过程的能量机制[J].岩石力学与工程学报,2008,27(9):1729-1740.XIE Heping,JU Yang,LI Liyun,et al.Rock deformation and failure process energy mechanism[J].Rock Mechanics and Engineering,2008,27(9):1729-1740.
[20]谢和平,鞠杨,黎立云,等.基于能量耗散与释放原理的岩石强度与整体破坏准则[J].岩石力学与工程学报,2005,24(17):3003-3010.XIE Heping,JU Yang,LI Liyun,et al.Based on the principle of energy dis-sipation and the release of rock strength and the overall failure crite-rion[J].Rock Mechanics and Engineering,2005,24(17):3003-3010.
[21]谢和平.岩石混凝土损伤力学[M].徐州:中国矿业大学出版社,1990.
[2]刘新荣,李栋梁,张梁,等.干湿循环对泥质砂岩力学特性及其微细观结构影响研究[J].岩土工程学报,2016,38(7):1291-1300.LIU Xinrong,LI Dongliang,ZHANG Liang,et al.Influence of wetting-drying cycles on mechanical properties and microstructure of shaly sandstone[J].Chinese Journal of Geotechnical Engineering,2016,38(7):1291-1300.
[3]姚华彦,张振华,朱朝辉,等.干湿交替对砂岩力学特性影响的试验研究[J].岩土力学,2010,31(12):3704-3708.YAO Huayan,ZHANG Zhenhua,ZHU Chaohui,et al.Experimental study of mechanical properties of sandstone under cyclic drying and wetting[J].Rock and Soil Mechanics,2010,31(12):3704-3708.
[4]傅晏,王子娟,刘新荣,等.干湿循环作用下砂岩细观损伤演化及宏观劣化研究[J].岩土工程学报,2017,39(9):1653-1661.FU Yan,WANG Zijuan,LIU Xinrong,et al.Meso damage evolution characteristics and macro degradation of sandstone under dry-wet cycle[J].Chinese Journal of Geotechnical Engineering,2017,39(9):1653-1661.
[5]刘新荣,王子娟,傅晏,等.考虑干湿循环作用泥质砂岩的强度与破坏准则研究[J].岩土力学,2017,38(12):1001-1007.LIU Xinrong,WANG Zijuan,FU Yan,et al.Strength and failure criterion of argillaceous sandstone based on dry-wet cycle[J].Rock and Soil Mechanics,2017,38(12):1001-1007.
[6]邓华锋,李建林,王孔伟,等.饱和-风干循环过程中砂岩次生孔隙率变化规律研究[J].岩土力学,2012,33(2):483-488.DENG Huafeng,LI Jianlin,WANG Kongwei,et al.Research on secondary porosity changing law of sandstone under saturation-air dry cycles[J].Rock and Soil Mechanics,2012,33(2):483-488.
[7]郑广辉,许金余,王鹏,等.水-岩耦合作用下红砂岩应变率效应研究[J].地下空间与工程学报,2017,13(1):79-85.ZHENG Guanghui,XU Jinyu,WANG Peng,et al.Research on strain rate effects of red-sandstone under water-rock coupling[J].Chinese Journal of Underground Space and Engineering,2017,13(1):79-85.
[8]刘新荣,傅晏,郑颖人,等.水岩相互作用对岩石劣化的影响研究[J].地下空间与工程学报,2012,8(1):77-88.LIU Xinrong,FU Yan,ZHENG Yingren,et al.A review on deterioration of rock caused by water-rock interaction[J].Chinese Journal of Underground Space and Engineering,2012,8(1):77-88.
[9]宋朝阳,纪洪广,刘阳军,等.围岩条件下邻近巷道掘进扰动影响因素[J].采矿与安全工程学报,2016,33(5):806-812.SONG Chaoyang,JI Hongguang,LIU Yangjun,et al.Influencing factors of excavation disturbance on neighboring roadways in weakly cemented rock[J].Journal of Mining and Safety Engineering,2016,33(5):806-812.
[10]陈绪新,付厚利,秦哲,等.干湿循环作用下露天矿边坡岩石损伤能量演化分析[J].科学技术与工程,2016,20(16):247-252.CHEN Xuxin,FU Houli,QIN Zhe,et al.Energy analysis of the evolution of open-pit slope rock damage under the effect of wetting and drying circulation[J].Science Technology and Engineering,2016,20(16):247-252.
[11]曾胜,李振存,陈涵杰,等.干湿循环下红砂岩强度衰减规律及工程应用[J].长沙理工大学学报:自然科学版,2011,8(4):18-23.ZENG Sheng,LI Zhencun,CHEN Hanjie,et al.Strength attenuation law and engineering application of red sand-stone with the action of dry-wet cycle[J].Journal of Changsha University of Science and Technology:natural science,2011,8(4):18-23.
[12]周顺林,尹帅,王凤琴,等.应力对泥页岩储层脆性影响的试验分析及应用[J].石油钻探技术,2017,45(3):113-120.ZHOU Shunlin,YIN Shuai,WANG Fengqin,et al.Experimental analysis of the effect of stress on shale reservoir brittleness and its application[J].Petroleum Drilling Techniques,2017,45(3):113-120.
[13]袁华玉,程远方,王伟,等.长水平段钻井泥岩井壁坍塌周期分析[J].科学技术与工程,2017,17(3):183-189.YUAN Huayu,CHENG Yuanfang,WANG Wei,et al.Analysis on time-dependent wellbore collapse for long horizontal well in shale formation[J].Science Technology and Engineering,2017,17(3):183-189.
[14]甘文宁.红砂岩工程特性的试验研究及应用[D].合肥:合肥工业大学,2014.
[15]宋朝阳.砂岩细观结构特征与变形破坏机理研究及应用[D].北京:北京科技大学,2017.
[16]姚华彦,朱大勇,周玉新,等.干湿交替作用后砂岩破裂过程实时观测与分析[J].岩土力学,2013,34(2):329-336.YAO Huayan,ZHU Dayong,ZHOU Yuxin,et al.Real-time observation and analysis of fracturing process of sandstone under cyclic drying and wetting[J].Rock and Soil Mechanics,2013,34(2):329-336.
[17]李克钢,郑东普,黄维辉,等.干湿循环作用下砂岩力学特性及其本构模型的神经网络模拟[J].岩土力学,2013,34(S2):168-173.LI Kegang,ZHENG Dongpu,HUANG Weihui,et al.Mechanical behavior of sandstone and its neural network simulation of constitutive model considering cyclic drying-wetting effect[J].Rock and Soil Mechanics,2013,34(S2):168-173.
[18]李克钢,吴勇,郑东普,等.砂岩力学特性对干湿循环效应响应规律的试验研究[J].北京理工大学学报,2013,33(10):1010-1014.LI Kegang,WU Yong,ZHENG Dongpu,et al.Mechanical properties response of sandstone to cyclic drying-wetting effect[J].Transactions of Beijing Institute of Technology,2013,33(10):1010-1014.
[19]谢和平,鞠杨,黎立云,等.岩体变形破坏过程的能量机制[J].岩石力学与工程学报,2008,27(9):1729-1740.XIE Heping,JU Yang,LI Liyun,et al.Rock deformation and failure process energy mechanism[J].Rock Mechanics and Engineering,2008,27(9):1729-1740.
[20]谢和平,鞠杨,黎立云,等.基于能量耗散与释放原理的岩石强度与整体破坏准则[J].岩石力学与工程学报,2005,24(17):3003-3010.XIE Heping,JU Yang,LI Liyun,et al.Based on the principle of energy dis-sipation and the release of rock strength and the overall failure crite-rion[J].Rock Mechanics and Engineering,2005,24(17):3003-3010.
[21]谢和平.岩石混凝土损伤力学[M].徐州:中国矿业大学出版社,1990.