应力–渗流耦合下砂岩力学行为与渗透特性试验研究

doi:10.13722/j.cnki.jrme.2019.0013

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摘要采用全自动三轴渗流实验系统，进行无水与排水条件下砂岩应力–渗流耦合试验，得到砂岩变形全过程应力–应变及渗透率演化曲线，较好地表征了应力–渗流耦合下砂岩力学行为与渗透率演化响应特征，同时获得了应力–渗流耦合下砂岩的变形、强度及渗透率演化规律。研究结果表明：(1) 砂岩峰值强度随着围压增大而不断增大，围压效应显著；无水条件下，砂岩峰值强度对应的轴向应变变化规律与强度演化特征呈现出明显的对应关系。其轴向变形与围压的关系较好地符合指数函数非线性增长模型，而排水条件下的砂岩轴向变形与有效围压的关系较好地符合线性衰减模型；(2) 砂岩峰前渗透率呈现出缓慢降低→平稳发展→急剧增加的三阶段演化规律，与砂岩峰前应力–应变曲线初始微裂纹压密、线弹性变形及新生裂纹扩展阶段三阶段变形具有对应关系；(3) 不同工况下的砂岩变形全过程渗透率呈现出降低→急剧增加→稳定发展或略微增大的三阶段演化规律，与砂岩变形全过程体积压缩→体积快速膨胀→体积缓慢膨胀三阶段变形具有对应关系。研究结论可为煤矿突水事故防治及巷道围岩稳定控制提供一定的理论依据。

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关键词 ：岩石力学, 应力&ndash, 渗流, 耦合效应, 力学行为, 渗透率

Abstract：Stress-seepage coupling tests of sandstone under anhydrous and drainage conditions were conducted by using the automatic triaxial seepage experiment system. The stress-strain and permeability evolution curves of sandstone were obtained during the deformation process，which could better characterize the mechanical behaviors and permeability evolution response characteristics of sandstone under stress-seepage coupling，and the evolution law of deformation，strength and permeability of sandstone was investigated under stress-seepage coupling condition. The results show that the peak strength of sandstone increases with increasing the confining pressure，which shows that confining pressure effect is significant. The axial strain evolution law corresponding to the peak strength is in obvious accordance with the strength evolution characteristics under the anhydrous condition. The axial deformation of sandstone accords an exponential nonlinear growth relation with the confining pressure under the anhydrous condition，while the relationship between the axial deformation of sandstone and the effective confining pressure under drainage condition obeys a linear attenuation model. The pre-peak permeability of sandstone shows a“three-stage”evolution law of decreasing slowly firstly，then developing steadily and increasing sharply lastly，which respectively corresponds to the initial micro-crack compaction stage，linear elastic deformation stage and new crack propagation stage of the pre-peak stress-strain curve of sandstone. The permeability of sandstone also shows a three-stage evolution law including decreasing firstly and followed by increasing sharply and developing stably or increasing slightly under different working conditions，which also has a corresponding relationship with the volume compression stage，volume rapid expansion stage and volume slow expansion stage during the deformation process. The research conclusions can provide a theoretical basis for the prevention and control of water inrush accidents in coal mine and the stability controll of roadway surrounding rock.

Key words： rock mechanics stress-seepage coupling effect mechanical behavior permeability

引用本文:

张俊文1，2，3，宋治祥1，范文兵1，黄达4. 应力–渗流耦合下砂岩力学行为与渗透特性试验研究[J]. 岩石力学与工程学报, 2019, 38(7): 1364-1372.
ZHANG Junwen1，2，3，SONG Zhixiang1，FAN Wenbing1，HUANG Da4. Experimental study on mechanical behavior and permeability characteristics of sandstone under stress-seepage coupling. , 2019, 38(7): 1364-1372.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0013 或 http://www.rockmech.org/CN/Y2019/V38/I7/1364

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