A laboratory investigation of thermally induced pore pressures in the Callovo-Oxfordian claystone
A laboratory investigation of thermally induced pore pressures in the Callovo-Oxfordian claystone
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DOI：
10.1016/j.ijrmms.2012.02.012
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发表时间：
2012-06-01
影响因子：
7.2
通讯作者：
Gatmiri, B.
中科院分区：
文献类型：
--
作者：
Mohajerani, M.;Delage, P.;Gatmiri, B.
在放射性废物处理研究的框架内，决定研究卡洛沃-牛津粘土岩（法国可能的寄主岩石）中发生的热诱导孔隙压力。由于水的热膨胀系数明显高于固体颗粒的热膨胀系数，在低渗透土壤和岩石中出现热孔隙压力。提供给实验室的粘土岩样品往往是去饱和的，因此特别强调了样品的饱和度，在原位有效应力条件下进行。热加压是通过在一个特殊的热各向同性压缩箱中进行不排水加热测试，同时测量孔隙压力的变化来研究的。特别注意校准程序，以说明系统对孔隙压力测量的影响。测得的热压系数随温度变化，主要是由于粘土的水热膨胀系数和排水压缩系数随温度变化所致。(C) 2012 Elsevier Ltd.版权所有。
In the framework of research into radioactive waste disposal, it was decided to investigate the thermally induce pore pressure occurring in the Callovo-Oxfordian claystone (a possible host rock in France). Thermal pore pressures appear in low permeability soils and rocks because the thermal expansion coefficient of water is significantly higher than that of the solid grains.Claystone samples provided to the laboratory are often desaturated, so particular emphasis was put on the saturation of the samples, carried out under in-situ effective stress condition.Thermal pressurization was investigated by performing undrained heating tests while measuring pore pressures changes in a specially adapted thermal isotropic compression cell. Special care was devoted to calibration procedures to account for the effects of the system on pore pressure measurements. The thermal pressurization coefficient measured appeared to change with temperature, mainly because of the changes with temperature of both the water thermal expansion coefficient and the drained compression coefficient of the claystone. (C) 2012 Elsevier Ltd. All rights reserved.