剪切位移作用下随机裂隙面渗流特性试验研究  

Experimental study of shear displacement effect seepage characteristics of random surface cracks

作　　者：雷进生[1] 李申[1] 武增琳 姚奇[1] 曾有为[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《岩石力学与工程学报》2016年第A02期3898-3905,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51279092;51278282);湖北省自然科学基金资助项目(2013CFB218)~~

摘　　要：利用剪切渗流耦合试验系统开展剪切渗流应力耦合试验,分析轴向压应力、剪切应力和渗透压力等因素共同作用下随机单裂缝渗流中的裂隙面渗流特性和运动规律。根据试验得到剪切荷载和剪切位移的关系曲线、法向位移和剪切位移的关系曲线,通过观察在不同渗透压力和轴向压力下剪切荷载、法向位移的变化,总结出在剪切渗流耦合运动中渗透压力、轴向压力对剪切荷载及法向位移的影响。利用试验所得到的渗流量,通过立方定律换算得到水力开度和剪切位移关系曲线,并根据曲线特性选择使用4参数Logistic函数进行拟合,得到剪切渗流耦合过程中剪胀角和应力之间的关系式。依据Logistic函数参数的数学意义,提出一种确定单裂隙剪切渗流耦合最危险切向位移点的新方法。In order to analyze the seepage characteristics and motion laws of fracture surface in random single crack under the influence of axial compressive stress,shear stress and osmotic pressure,shear seepage stress coupling tests were carried out by using shear flow coupling test system. According to the relationship curves of shear load and tangential displacement,the relationship curves of the normal displacement and the tangential displacement acquired by the experiment,the influence of the shear load and the normal displacement on the shear load and normal displacement was summarized. The relationship curves of hydraulic opening and tangential displacement was acquired by using the cubic law and seepage quantity. According to the characteristics of the curves,the four parameters Logistic function was used to fit the curve,and a good result was achieved. Depending on that,the relationship between shearing expansive angle and stress in the process of shear flow coupling was proposed. What is more,a new method to locate the dangerous point in the shear dilatation stage which can be presented through the parameter of the function.

关 键 词：渗流力学 裂隙 剪切 水力开度 Logisitic函数 

分 类 号：O357[理学—流体力学]