摘要
为探讨温度和孔隙压力对岩石渗透率的影响规律,采用中国矿业大学211工程建设项目"20 MN伺服控制高温高压岩体三轴试验机",在不同温度和恒定压力条件下,对长石细砂岩进行大试样的实时渗透率研究,试样为圆柱体,外观尺寸为φ200 mm×400 mm。加温试验发现,长石细砂岩渗透率存在门槛值温度,当温度达到门槛值后,其渗透率出现大幅度增加,与室温状态相比,渗透率增加65倍。在长石细砂岩热破裂的门槛值温度区域,长石细砂岩渗透率同时具有孔隙压力门槛值,其渗透率在孔隙压力门槛值发生剧烈变化,大幅度增加;继续增加温度脱离温度门槛值后,孔隙压力对于渗透率的影响随之减弱。
In order to study the rule of effects of temperature and effective pore pressure on rock permeability,the 20 MN servo-controlled triaxial rock testing machine with high temperature and high pressure is used to research feldspar fine sandstone′s permeability with time under different temperatures and triaxial compression tests.The rock sample is cylinder-shaped,and the dimensions of rock sample is φ 200 mm×400 mm.With the experimental results,there is a temperature threshold of feldspar fine sandstone′s permeability during the rising course of temperature.Feldspar fine sandstone′s permeability rises abruptly when feldspar fine sandstone′s temperature reaches its temperature threshold.The permeability of feldspar fine sandstone is 65 times against that under indoor temperature.Moreover,it exceeds the threshold of pore pressure in the area of temperature threshold of feldspar fine sandstone at the same time.At the threshold of pore pressure,feldspar fine sandstone′s permeability changes acutely,rising more than that under low pore pressure.The effect of pore pressure on feldspar fine sandstone′s permeability declines even if raising feldspar fine sandstone temperature over the temperature threshold of feldspar fine sandstone.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2008年第1期53-58,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金重点项目(50534030)
关键词
岩石力学
长石细砂岩
渗透率
温度
孔隙压力
rock mechanics
feldspar fine sandstone
permeability
temperature
pore pressure
作者简介
张渊（1974-），男，博士，1996年毕业于山西矿业学院矿井建设专业，现任讲师，主要从事岩石力学方面的教学与研究工作。E—mail：zhyuan111@163．com
