不同围压不同损伤程度红砂岩渗流特性试验研究

doi:10.13722/j.cnki.jrme.2020.0266

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摘要为研究不同围压不同损伤程度红砂岩渗流特性，采用Rock Top多场耦合试验仪，进行不同围压条件下红砂岩水–力耦合试验研究。研究结果表明：(1) 随围压等梯度增大，破坏形式由单一主控裂纹型劈裂破坏向多裂纹堆叠形成的树枝型破坏转变，且高围压状态下破裂面附近呈粉末状。(2) 应力差水平相同时，渗透率随围压增大而减小，围压对渗流抑制作用显著；随应力差等梯度上升，围压增大导致岩石渗透率变化幅度减小；随围压等梯度增大，岩样的起裂应力及损伤应力均逐渐增大但变化幅度逐渐减小。(3) 通过稳态法及瞬态法发现在不同围压条件下的渗透率在岩石峰前均经历缓慢下降–近似平稳–缓慢增加–快速增长4个阶段，与全应力–应变曲线相对应。基于试验结果，推导出岩石损伤指标与渗透率的关系式，揭示了渗透率随岩石损伤指标变化的演化规律。

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	张培森1
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	侯季群1
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	赵成业1
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	李腾辉1
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关键词 ：岩石力学, 水力耦合, 不同损伤, 裂隙扩展, 渗透特性, 低渗

Abstract：In order to study the seepage characteristics of red sandstone under different confining pressures and damage degrees，water-force coupling tests of red sandstone under different confining pressures were carried out by Rock Top multi-field coupling apparatus. The results show that，with increasing the confining pressure at a constant gradient，the failure mode changes from single master crack splitting failure to multi-crack stacked dendritic failure and the failure surface is powdery under high confining pressure. Under the same deviator stress，the permeability decreases with increasing the confining pressure，showing that the confining pressure has a significant effect on seepage inhibition. When the gradient of the deviation stress grows，the permeability variation range decreases with increasing the confining pressure. With increasing the confining pressure as a constant gradient，the initial stress and damage stress of the rock sample increase gradually，but the change range decreases gradually. It was found by steady-state method and transient method that the permeability under different confining pressures experiences four stages of slow decline，approximate stable，slow increase and rapid growth before peak stress，corresponding to the stress-strain curve. Based on the test results，the relationship between the rock damage index and the permeability was deduced，and the evolution law of the permeability with the rock damage index was revealed.

Key words： rock mechanics')" href="#">

rock mechanics hydraulic coupling different damages crack propagation permeability characteristics ')" href="#">low permeability

引用本文:

张培森1，2，侯季群1，2，赵成业1，2，李腾辉1，2. 不同围压不同损伤程度红砂岩渗流特性试验研究[J]. 岩石力学与工程学报, 2020, 39(12): 2405-2415.
ZHANG Peisen1，2，HOU Jiqun1，2，ZHAO Chengye1，2，LI Tenghui1，2. Experimental study on seepage characteristics of red sandstone with different confining pressures and different damage degrees. , 2020, 39(12): 2405-2415.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0266 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I12/2405

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