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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。
Shear seepage coupling test was carried out by using shear-seepage coupling test system to analyze the seepage characteristics and movement law of the fractured surface in random single fracture seepage joint under the action of axial compressive stress, shear stress and seepage pressure. According to the experiment, the relation curve between shear load and shear displacement, the relation curve between normal displacement and shear displacement are obtained. By observing the change of shear load and normal displacement under different osmotic pressure and axial pressure, Influence of Osmotic Pressure and Axial Pressure on Shear Load and Normal Displacement in Cut - coupled Flow Coupling Movement. Using the seepage flow obtained from the experiment, the hydraulic opening and the shear displacement curve are obtained by the cubic law conversion. According to the curve characteristics, the four-parameter Logistic function is selected to be fitted to obtain the dilatancy angle and stress during the shear seepage coupling process Relationship between. According to the mathematical meaning of Logistic function parameter, a new method to determine the most dangerous tangential displacement point coupled by shear flow and percolation is proposed.