酸性溶蚀作用下灰岩弱化力学效应的试验研究
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摘要
通过自制的自平衡岩石真三轴压缩仪(SRT)对灰岩岩样在溶蚀作用下真三轴、常规三轴的压缩试验,探讨了试样在不同的应变条件下溶蚀作用对于轴向的抗压强度的溶蚀效应;真三轴实验σ2的初始应力高于常规三轴的围压但是其σ3未施加应力约束使得灰岩岩样的抗压峰值强度任低于常规三轴的抗压峰值;溶蚀作用对于灰岩力学性质发生改变机理在于溶蚀作用使得裂隙临界应力强度因子降低,其灰岩宏观力学特性不断弱化,但灰岩力学破坏机理并没有本质上的改变。从而对岩溶地区岩体工程的长期稳定性提供了科学依据。
Through self-balanced true triaxial compression test(SRT) of limestone samples under dissolution, the dissolution effect of dissolution on axial compressive strength of limestone samples under different strain conditions is discussed. The initial stress of true triaxial test σ2 is higher than that of conventional triaxial confining pressure, but the stress constraint of σ3 is not applied to make limestone samples compressive. The mechanism of the change of mechanical properties of limestone due to dissolution is that the critical stress intensity factor of fracture decreases and the macro-mechanical properties of limestone weakens continuously, but the mechanical failure mechanism of limestone has not changed essentially. This provides a scientific basis for the long-term stability of rock mass engineering in Karst areas.
Through self-balanced true triaxial compression test(SRT) of limestone samples under dissolution, the dissolution effect of dissolution on axial compressive strength of limestone samples under different strain conditions is discussed. The initial stress of true triaxial test σ2 is higher than that of conventional triaxial confining pressure, but the stress constraint of σ3 is not applied to make limestone samples compressive. The mechanism of the change of mechanical properties of limestone due to dissolution is that the critical stress intensity factor of fracture decreases and the macro-mechanical properties of limestone weakens continuously, but the mechanical failure mechanism of limestone has not changed essentially. This provides a scientific basis for the long-term stability of rock mass engineering in Karst areas.
引文
[1]王亚,万文,赵延林,罗世林,唐劲舟.渗透压作用下茅口灰岩的强度特性[D],北京:矿业工程研究,2015.
[2]郭佳奇,刘希亮,乔春生.自然与保水状态下岩溶灰岩力学性质及能量机制试验研究[J].岩石力学与工程学报,2013.
[3]祝文化,李元章.损伤灰岩动态压缩力学特性的实验研究[J].武汉理工大学学报,2006,28(7):90-92.
[4]丁梧秀,陈建平,徐桃,陈华军,王宏毅.化学溶液侵蚀下灰岩的力学及化学特性研究[J].基础理论与实验研究,2015.
[5]杨天鸿,屠晓利,於斌,张永彬,李连崇,唐春安,谭国焕.岩石破裂与渗流耦合过程细观力学模型[J].固体力学学报,2005(03).
[6]王兴宏.茅口裂隙灰岩渗流-应力耦合试验研究[D].湖南:湖南科技大学,2015.
[7]张贵金,徐卫亚.岩溶坝区溶蚀岩体的渗透性变异研究[J].岩石力学与工程学报,2005,24(9):1527-1534.
[8]Zhang S, Cox S F, Paterson M S. The influence of roomtemperature deformation on porosity and permeability in calciteaggregates[J]. J. Geophys. Res., 1994, 99:15761-15775.
[9]Mordecai M, Morris L H. An investigation into the changesof permeability occurring in a sandstone when failed under triaxialstress conditions[C]. Proc. U. S. Rock Mech. Symp,1971,12:221-239.
[10]曾晓波.缅甸滚弄水电站枢纽区可溶岩溶蚀特征研究[J].水电站设计,2017,33(02):98-103.
[11]陈四利,冯夏庭,李邵军.岩石单轴抗压强度与破裂特征的化学腐蚀效应[J].岩石力学与工程学报,2003(04):547-551.
[12]冯夏庭,王川婴,陈四利.受环境侵蚀的岩石细观破裂过程试验与实时观测[J].岩石力学与工程学报,2002(07):935-939.
[2]郭佳奇,刘希亮,乔春生.自然与保水状态下岩溶灰岩力学性质及能量机制试验研究[J].岩石力学与工程学报,2013.
[3]祝文化,李元章.损伤灰岩动态压缩力学特性的实验研究[J].武汉理工大学学报,2006,28(7):90-92.
[4]丁梧秀,陈建平,徐桃,陈华军,王宏毅.化学溶液侵蚀下灰岩的力学及化学特性研究[J].基础理论与实验研究,2015.
[5]杨天鸿,屠晓利,於斌,张永彬,李连崇,唐春安,谭国焕.岩石破裂与渗流耦合过程细观力学模型[J].固体力学学报,2005(03).
[6]王兴宏.茅口裂隙灰岩渗流-应力耦合试验研究[D].湖南:湖南科技大学,2015.
[7]张贵金,徐卫亚.岩溶坝区溶蚀岩体的渗透性变异研究[J].岩石力学与工程学报,2005,24(9):1527-1534.
[8]Zhang S, Cox S F, Paterson M S. The influence of roomtemperature deformation on porosity and permeability in calciteaggregates[J]. J. Geophys. Res., 1994, 99:15761-15775.
[9]Mordecai M, Morris L H. An investigation into the changesof permeability occurring in a sandstone when failed under triaxialstress conditions[C]. Proc. U. S. Rock Mech. Symp,1971,12:221-239.
[10]曾晓波.缅甸滚弄水电站枢纽区可溶岩溶蚀特征研究[J].水电站设计,2017,33(02):98-103.
[11]陈四利,冯夏庭,李邵军.岩石单轴抗压强度与破裂特征的化学腐蚀效应[J].岩石力学与工程学报,2003(04):547-551.
[12]冯夏庭,王川婴,陈四利.受环境侵蚀的岩石细观破裂过程试验与实时观测[J].岩石力学与工程学报,2002(07):935-939.