循环加卸载下柱状节理材料渗透率和孔隙度演化规律研究

发布时间：2018-04-06 23:26

本文选题：岩石力学　切入点：柱状节理　出处：《岩石力学与工程学报》2017年01期

【摘要】：为了研究柱状节理岩体在多次围压循环加卸载下渗透率与孔隙度的演化规律,利用致密岩石惰性气体渗透测试装置,对柱状节理岩体相似材料进行3次围压循环加卸载模型试验,测量柱状节理岩体相似材料在3次围压循环加卸载下渗透率与孔隙度的变化过程,研究渗透率、孔隙度与围压之间的变化关系以及对应力的敏感性。试验结果表明:在第一次围压加载阶段,柱状节理材料渗透率和孔隙度变化较大,且围压卸载后不能恢复初始状态,在此后的围压循环加卸载阶段,围压变化对柱状节理岩体渗透率和孔隙度的影响较小;加载阶段,渗透率和孔隙度与围压均成幂函数关系;卸载阶段,渗透率与围压成幂函数关系,孔隙度与围压成指数函数关系;随围压增大,渗透率和孔隙度对围压变化的敏感性均减少,围压卸载后,渗透率和孔隙度对围压变化的敏感性可以恢复;在每个围压循环加卸载阶段,渗透率对围压变化的敏感性与柱体倾角的关系曲线均呈双峰形,且第一个峰值总是大于第二个峰值;围压加载阶段孔隙度与渗透率成幂函数关系,围压卸载阶段孔隙度与渗透率成指数函数关系;柱状节理材料的孔隙度越大,渗透率对孔隙度变化的敏感性越强;柱状节理材料渗透率对孔隙度变化的敏感性与柱体倾角的关系曲线呈双峰形,且第一个峰值大于第二个峰值。
[Abstract]:In order to study the columnar jointed rock mass in pressure evolution of porosity and permeability under cyclic loading and unloading times around, penetration testing device using inert gas in dense rock, columnar jointed rock similar material pressure cyclic loading model test 3 Wai, measuring the columnar jointed rock body of similar material in the process of pressure, change of permeability and porosity the cyclic loading and unloading 3 times around the study of changes in the relationship between the sensitivity of permeability, porosity and confining pressure and stress. Test results show that: in the loading stage for the first time around, the columnar jointed material porosity and permeability changes greatly, and around cannot restore the initial state pressure after unloading confining pressure in the cyclic loading and unloading stage since then, little influence of confining pressure change of columnar jointed rock mass permeability and porosity; loading stage, the porosity and permeability and confining pressure have power function relationship; unloading stage, infiltration The rate of penetration and confining pressure into power function relation, porosity and confining pressure exponent; with the increasing of confining pressure, the sensitivity of permeability and porosity for confining pressure changes were reduced, unloading confining pressure, permeability and porosity on the sensitivity of confining pressure change can be restored; in each cycle of loading and unloading confining pressure stage, relationship curve of permeability on confining pressure change sensitivity and column angle showed a Shuangfeng shape, and the first peak is higher than the second peak; the confining pressure stage of a power function relationship between permeability and porosity, confining pressure unloading stage porosity exponent and permeability; columnar jointed material porosity greater sensitivity to permeability the change of porosity is stronger; curve of columnar jointed material permeability on porosity variation sensitivity and column angle of Shuangfeng, and the first peak is higher than the second peak.

【作者单位】：河海大学港口海岸与近海工程学院;河海大学岩土工程科学研究所;
【基金】：国家自然科学基金资助项目(11272113,51479049,11572110)~~
【分类号】：TV223

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