不同加载速率下砂岩渗透率演化规律研究
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摘要
利用自主研制的伺服控制三轴岩石力学试验机,研究了砂岩在0.01~1μm/s不同加载速率下全应力应变过程中的渗透特性演化规律。结果表明:不同加载速率下砂岩渗透率随应变增加存在阈值渗透率、拐点渗透率和峰值渗透率,对应的应变为阈值应变、拐点应变和峰值应变;不同加载速率下,砂岩渗透率曲线变化趋势基本一致,即砂岩渗透率随应变变化呈现阶段性,初始应变至阈值应变为第一阶段,渗透率随应变增加不断降低,阈值应变至拐点应变为第二阶段,渗透率随着应变的增加缓慢增加,拐点应变至峰值应变为第三阶段,渗透率在该阶段内迅速增加,直至达到最大值;峰值应变之后是第四阶段,该阶段内渗透率随应变增加而略微降低;随加载速率从0.01μm/s增加至1μm/s,拐点应变之后的渗透率随加载速率增加而降低。
The evolution laws of sandstone permeability under complete stress-strain process and the loading rates from 0.01μm/s to 1μm/s were studied by self-development servo-controlled machine for triaxial test of rock mechanics.The results indicated that under different loading rates,sandstone permeability ratepresented critical permeability,inflection point permeability and peak permeability with the increase of strain variation,relating to critical strain,inflection point strain and peak strain,respectively.Under different loading rates,the curve change trend of sandstone permeability were basically the same,namely the change of sandstone permeability with the stain showed stages.The first stage was from initial strain to critical strain,in which the permeability rate decreased with the increasing strain.The second stage was from critical strain and inflection point strain,in which the permeability rate slightly increased with the increasing strain.The third stage was inflection point strain to peak strain,in which the permeability rate rise shapely until reached the maximum value.Finally,the fourth stage was after the peak strain,in which the permeability rate slightly decreased with the increase of strain.The permeability after inflection point strain decreased with increasing loading rate ranging from 0.01μm/s to 1μm/s.
The evolution laws of sandstone permeability under complete stress-strain process and the loading rates from 0.01μm/s to 1μm/s were studied by self-development servo-controlled machine for triaxial test of rock mechanics.The results indicated that under different loading rates,sandstone permeability ratepresented critical permeability,inflection point permeability and peak permeability with the increase of strain variation,relating to critical strain,inflection point strain and peak strain,respectively.Under different loading rates,the curve change trend of sandstone permeability were basically the same,namely the change of sandstone permeability with the stain showed stages.The first stage was from initial strain to critical strain,in which the permeability rate decreased with the increasing strain.The second stage was from critical strain and inflection point strain,in which the permeability rate slightly increased with the increasing strain.The third stage was inflection point strain to peak strain,in which the permeability rate rise shapely until reached the maximum value.Finally,the fourth stage was after the peak strain,in which the permeability rate slightly decreased with the increase of strain.The permeability after inflection point strain decreased with increasing loading rate ranging from 0.01μm/s to 1μm/s.
引文
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[12]单科科.不同粒径砂岩力学特性试验研究[J].江西水利科技,2016,42(04):249-254.
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[14]梁忠雨,高峰,杨晓蓉,等.加载速率对岩石声发射信号影响的试验研究[J].矿业研究与开发,2010,30(01):12-14,95.
[15]尹小涛,葛修润,李春光,等.加载速率对岩石材料力学行为的影响[J].岩石力学与工程学报,2010(S1):2610-2615.
[16]薛东杰,周宏伟,王子辉,等.不同加载速率下煤岩采动力学响应及破坏机制[J].煤炭学报,2016(03):595-602.
[17]李彦伟,姜耀东,杨英明,等.煤单轴抗压强度特性的加载速率效应研究[J].采矿与安全工程学报,2016(04):754-760.
[18]曹安业,井广成,窦林名,等.不同加载速率下岩样损伤演化的声发射特征研究[J].采矿与安全工程学报,2015,32(06):923-928,935.
[19]陈勉,张艳,金衍,等.加载速率对不同岩性岩石Kaiser效应影响的试验研究[J].岩石力学与工程学报,2009(S1):2599-2604.
[2]王金安,彭苏萍,孟召平.岩石三轴全应力应变过程中的渗透规律[J].北京科技大学学报,2001(06):489-491.
[3]赵连涛,于旭磊,刘启蒙,等.煤层底板岩石全应力—应变渗透性试验[J].煤田地质与勘探,2006(06):37-40.
[4]曾志姣,李小春,石露,等.泥岩和砂岩的渗透率随围压变化特性的对比[J].交通科学与工程,2015,31(04):1-5.
[5]俞缙,李宏,陈旭,等.渗透压-应力耦合作用下砂岩渗透率与变形关联性三轴试验研究[J].岩石力学与工程学报,2013,32(06):1203-1213.
[6]姜春露,孙强,姜振泉,等.脆性岩石全应力应变过程中渗透性突变研究[J].中南大学学报(自然科学版),2012,43(02):688-693.
[7]季小凯,郭建斌,邢同菊,等.煤系沉积岩应力-应变与应变-渗透率特征[J].煤田地质与勘探,2015(03):66-71,76.
[8]彭苏萍,屈洪亮,罗立平,等.沉积岩石全应力应变过程的渗透性试验研究[J].煤炭学报,2000(02):113-116.
[9]俞缙,穆康,李宏,等.砂岩渗透性演化特性的孔隙率分布细观模拟分析[J].工程力学,2014(11):124-131.
[10]李世平,李玉寿,吴振业.岩石全应力应变过程对应的渗透率-应变方程[J].岩土工程学报,1995(02):13-19.
[11]巢志明,王环玲,徐卫亚,等.不同饱和度砂岩渗透率、孔隙度随应力变化规律研究[J].岩石力学与工程学报,2017,36(03):665-680.
[12]单科科.不同粒径砂岩力学特性试验研究[J].江西水利科技,2016,42(04):249-254.
[13]郭擎,鲜学福,周军平.煤岩全应力应变过程体应变对渗透率的影响[J].地下空间与工程学报,2015(05):1137-1143.
[14]梁忠雨,高峰,杨晓蓉,等.加载速率对岩石声发射信号影响的试验研究[J].矿业研究与开发,2010,30(01):12-14,95.
[15]尹小涛,葛修润,李春光,等.加载速率对岩石材料力学行为的影响[J].岩石力学与工程学报,2010(S1):2610-2615.
[16]薛东杰,周宏伟,王子辉,等.不同加载速率下煤岩采动力学响应及破坏机制[J].煤炭学报,2016(03):595-602.
[17]李彦伟,姜耀东,杨英明,等.煤单轴抗压强度特性的加载速率效应研究[J].采矿与安全工程学报,2016(04):754-760.
[18]曹安业,井广成,窦林名,等.不同加载速率下岩样损伤演化的声发射特征研究[J].采矿与安全工程学报,2015,32(06):923-928,935.
[19]陈勉,张艳,金衍,等.加载速率对不同岩性岩石Kaiser效应影响的试验研究[J].岩石力学与工程学报,2009(S1):2599-2604.