不同卸荷路径对砂岩渗透性演化影响的试验研究

doi:10.13722/j.cnki.jrme.2018.1140

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摘要为了研究初始围压和卸荷速率对砂岩卸荷变形破坏过程中渗透性演化规律的影响，开展考虑不同初始围压(10，20，30 MPa)、不同卸荷速率(0.1，0.5，1.0，1.5 MPa/min)下的三轴卸荷渗流力学试验研究。研究结果表明：(1) 砂岩卸荷破坏时表现为明显脆性特征，且随初始围压和卸荷速率的增大，砂岩侧向变形和体积扩容特性愈加明显。(2) 砂岩卸荷破坏过程中渗透率演化规律与卸荷应力–应变关系密切相关，呈现阶段性变化特征，即弹性变形阶段渗透率增长缓慢；屈服变形阶段渗透率加速增长；达到卸荷峰值应力后，进入应力跌落阶段，此时渗透率急剧增长，并发生突跳现象；卸荷破坏后残余强度阶段，渗透率快速下降并趋于稳定。(3) 不同初始围压和卸荷速率对砂岩卸荷变形破坏过程中渗透性演化影响明显，初始卸荷围压越高，卸荷破坏时的卸荷量越大，但卸荷量与初始围压比值越小；卸荷速率越大，砂岩卸荷破坏时产生的卸荷量越大，所处围压水平越低，渗透率峰值越高。研究成果可为深埋地下岩石工程围岩渗透性演化与安全评价提供参考。

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	王如宾1
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	徐波2
	徐卫亚1
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	王伟1
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	林志南2
	张久长3

关键词 ：岩石力学, 渗透性演化, 初始围压, 卸荷速率, 卸荷路径

Abstract：In order to study the influence of the initial confining pressure and the unloading rate on permeability evolution of sandstone during unloading process，triaxial unloading seepage tests were carried out under different high initial confining pressures(10，20，30 MPa) and different unloading rates(0.1，0.5，1.0，1.5 MPa/min). The results show that the sandstone occurs brittle failure and that the lateral deformation and the volume expansion increase significantly with increasing the initial confining pressure or the unloading rate. The permeability evolution is closely related to the unloading stress and strain characteristics. The permeability increases slowly at the elastic deformation stage，rapidly at the yield deformation stage and sharply at the stress dropping stage，and eventually decreases to a stable value at the residual strength stage. The initial confining pressure and the unloading rate have a significant influence on the permeability evolution of sandstone. With increasing the initial confining pressure，the variation of the unloading pressure from the beginning of unloading to the moment of failure increases while the ratio between the final and initial confining pressures decreases. With ascending the unloading rate，the variation of the unloading pressure increases and the peak value of the permeability increases due to a lower confining pressure at failure. The results could provide a good reference for permeability and safety evaluation of surrounding rocks in deep underground rock engineering.

Key words： rock mechanics permeability evolution initial confining pressure unloading rate unloading stress paths

引用本文:

王如宾1，2，徐波2，徐卫亚1，2，王伟1，2，林志南2，张久长3. 不同卸荷路径对砂岩渗透性演化影响的试验研究[J]. 岩石力学与工程学报, 2019, 38(3): 467-475.
WANG Rubin1，2，XU Bo2，XU Weiya1，2，WANG Wei1，2，LIN Zhinan2，ZHANG Jiuchang3. Experimental research of the influence of different unloading stress paths on permeability evolution of sandstone. , 2019, 38(3): 467-475.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1140 或 http://www.rockmech.org/CN/Y2019/V38/I3/467

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